Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=(f,F),(f,-F),;H=(F,f),(-F,f),
for i in r(n):*a,c=I();R+=(a,c),;Y+=c,;X+=a
for i in r(m):a,*b=I();H+=(a,b),;X+=a,;Y+=b
def g(X):s=sorted(set(X));l=len(s);return{s[i]:i for i in r(l)},s,l
h,s,K=g(X);w,t,L=g(Y);V,U,v=[[[0]*-~K for i in r(L+1)]for _ in r(3)];q=[(h[0],w[0])];z=0
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]-=1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]-=1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
while q:
 x,y=q.pop();v[y][x]=1;z+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in(-1,0),(1,0),(0,1),(0,-1),:
  c=x+e;d=y+f
  if(1-v[d][c])*(0==U[(f>0)+y][x]*f+V[y][(e>0)+x]*e):q+=(c,d),;v[d][c]=1
print([z,'INF'][z>F])

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Runtime Error):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=(f,F),(f,-F),;H=(F,f),(-F,f),
for i in r(n):*a,c=I();R+=(a,c),;Y+=c,;X+=a
for i in r(m):a,*b=I();H+=(a,b),;X+=a,;Y+=b
def g(X):s=sorted(set(X));l=len(s);return{s[i]:i for i in r(l)},s,l
h,s,K=g(X);w,t,L=g(Y);V,U,v=[[[0]*-~K for i in r(L+1)]for _ in r(3)]
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]-=1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]-=1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];a=0
while q:
 x,y=q.pop();v[y][x]=1;a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in(-1,0),(1,0),(0,1),(0,-1),:
  c=x+e;d=y+f
  if 1-v[d][c]and U[(f>0)+y][x]*f+V[y][(e>0)+x]*e==0:q+=[(c,d)];v[d][c]=1
print [a,'INF'][a>F]

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=(f,F),(f,-F),;H=(F,f),(-F,f),
for i in r(n):*a,c=I();R+=(a,c),;Y+=c,;X+=a
for i in r(m):a,*b=I();H+=(a,b),;X+=a,;Y+=b
def g(X):s=sorted(set(X));l=len(s);return{s[i]:i for i in r(l)},s,l
h,s,K=g(X);w,t,L=g(Y);V,U,v=[[[0]*-~K for i in r(L+1)]for _ in r(3)]
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]-=1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]-=1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];a=0
while q:
 x,y=q.pop();v[y][x]=1;a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in(-1,0),(1,0),(0,1),(0,-1),:
  c=x+e;d=y+f
  if 1-v[d][c]and U[(f>0)+y][x]*f+V[y][(e>0)+x]*e==0:q+=(c,d),;v[d][c]=1
print([a,'INF'][a>F])

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):*a,c=I();R+=(a,c),;Y+=c,;X+=a
for i in r(m):a,*b=I();H+=(a,b),;X+=a,;Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*-~K for i in r(L+1)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]-=1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]-=1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in(-1,0),(1,0),(0,1),(0,-1),:
  c=x+e;d=y+f
  if 1-v[d][c]and(U[(f>0)+y][x]|e==0)|(V[y][(e>0)+x]|f==0):q+=(c,d),;v[d][c]=1
print([a,'INF'][a>F])

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):*a,c=I();R+=(a,c),;Y+=c,;X+=a
for i in r(m):a,*b=I();H+=(a,b),;X+=a,;Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*-~K for i in r(L+1)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]-=1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]-=1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in(-1,0),(1,0),(0,1),(0,-1),:
  c=x+e;d=y+f
  if 1-v[d][c]and(U[(f>0)+y][x]|e==0)|(V[y][(e>0)+x]|f==0):q+=(c,d),;v[d][c]=1
print([a,'INF'][a>F])

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):*a,c=I();R+=(a,c),;Y+=c,;X+=a
for i in r(m):a,*b=I();H+=(a,b),;X+=a,;Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*-~K for i in r(L+1)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]-=1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]-=1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if 1-v[d][c]and(U[(f>0)+y][x]|e==0)|(V[y][(e>0)+x]|f==0):q+=(c,d),;v[d][c]=1
print([a,'INF'][a>F])

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):*a,c=I();R+=[(a,c)];Y+=c,;X+=a
for i in r(m):a,*b=I();H+=[(a,b)];X+=a,;Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)+1
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*-~K for i in r(L+1)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(U[(f>0)+y][x]|e==0)|(V[y][(e>0)+x]|f==0)and 0==v[d][c]:q+=[(c,d)];v[d][c]=1
print([a,'INF'][a>F])

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Runtime Error):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R,H=[],[]
for i in r(n):*a,c=I();R+=[(a,c)];Y+=c,;X+=a
for i in r(m):a,*b=I();H+=[(a,b)];X+=a,;Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)+1
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*-~K for i in r(L+1)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(K>c>=0<=d<L)*v[d][c]==0and(U[(f>0)+y][x]|e==0)|(V[y][(e>0)+x]|f==0):q+=[(c,d)];v[d][c]=1
print([a,'INF'][a>F])

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=Y=[0]+f;R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):*a,c=I();R+=[(a,c)];Y+=[c];X+=a
for i in r(m):a,*b=I();H+=[(a,b)];X+=[a];Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)+1
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*-~K for i in r(L+1)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(K>c>=0<=d<L)*v[d][c]==0:
   if U[(f>0)+y][x]|e==0 or V[y][(e>0)+x]|f==0:q+=[(c,d)];v[d][c]=1
if a>F:a='INF'
print(a)

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=Y=[0]+f;R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):*a,b=I();R+=[(a,b)];Y+=b,;X+=a
for i in r(m):a,*b=I();H+=[(a,b)];X+=a,;Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)+1
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*-~K for i in r(L+1)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for a,(b,c)in H:V[w[b]][h[a]]+=1;V[w[c]][h[a]]+=-1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(K>c>=0<=d<L)*v[d][c]==0:
   if U[(f>0)+y][x]|e==0 or V[y][(e>0)+x]|f==0:q+=[(c,d)];v[d][c]=1
if a>F:a='INF'
print(a)

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=Y=[0]+f;R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):*a,b=I();R+=[(a,b)];Y+=b,;X+=a
for i in r(m):a,*b=I();H+=[(a,b)];X+=a,;Y+=b
def g(X):s=dict(enumerate(sorted(set(X))));return{s[i]:i for i in s},s,len(s)
h,s,K=g(X);w,t,L=g(Y);j=lambda:[[0]*(K+2)for i in r(L+2)];V=j();U=j();v=j()
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for i in r(L+1):
 for j in r(K+1):U[i][j+1]+=U[i][j];V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(K>c>=0<=d<L)*v[d][c]==0:
   if U[(f>0)+y][x]|e==0 or V[y][(e>0)+x]|f==0:q+=[(c,d)];v[d][c]=1
if a>F:a='INF'
print(a)

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=[0]+f;Y=X[:];R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):a,b,c=I();R+=[((a,b),c)];Y+=[c];X+=[a,b]
for i in r(m):a,b,c=I();H+=[(a,(b,c))];X+=[a];Y+=[b,c]
s=dict(enumerate(sorted(set(X))));K=len(s);t=dict(enumerate(sorted(set(Y))));L=len(t);h=dict(zip(s.values(),s.keys()));w=dict(zip(t.values(),t.keys()));V=[[0]*-~K for i in r(L+1)];U=[i[:]for i in V];v=[i[:]for i in V]
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j]
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for j in r(K):
 for i in r(L):V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(K>c>=0<=d<L)*v[d][c]==0:
   if U[(f>0)+y][x]|e==0 or V[y][(e>0)+x]|f==0:q+=[(c,d)];v[d][c]=1
if a>F:a='INF'
print(a)

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=set([0]+f);Y=set(X);R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):a,b,c=I();R+=[((a,b),c)];Y.add(c);X.add(a);X.add(b)
for i in r(m):a,b,c=I();H+=[(a,(b,c))];X.add(a);Y.add(b);Y.add(c)
s=dict(enumerate(sorted(X)));K=len(s);t=dict(enumerate(sorted(Y)));L=len(t);h=dict(zip(s.values(),s.keys()));w=dict(zip(t.values(),t.keys()));V=[[0]*-~K for i in r(L+1)];U=[i[:]for i in V];v=[i[:]for i in V]
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for i in r(L):
 for j in r(K):U[i][j+1]+=U[i][j]
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for j in r(K):
 for i in r(L):V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(K>c>=0<=d<L)*v[d][c]==0:
   if U[(f>0)+y][x]|e==0 or V[y][(e>0)+x]|f==0:q+=[(c,d)];v[d][c]=1
if a>F:a='INF'
print(a)

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1e21;r=range;n,m=I();f=[-F,F];X=set([0]+f);Y=set(X);R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):a,b,c=I();R+=[((a,b),c)];Y.add(c);X.add(a);X.add(b)
for i in r(m):a,b,c=I();H+=[(a,(b,c))];X.add(a);Y.add(b);Y.add(c)
s=dict(enumerate(sorted(X)));K=len(s);t=dict(enumerate(sorted(Y)));L=len(t);h=dict(zip(s.values(),s.keys()));w=dict(zip(t.values(),t.keys()));V=[[0]*-~K for i in r(L+1)];U=[i[:]for i in V];v=[i[:]for i in V]
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for i in r(L+1):
 for j in r(K):U[i][j+1]+=U[i][j]
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for j in r(K+1):
 for i in r(L):V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(0<=c<K)*(0<=d<L)*(v[d][c]==0)*(U[-~f//2+y][x]==0if f!=0else V[y][-~e//2+x]==0):q+=[(c,d)];v[d][c]=1
if a>F:a='INF'
print(a)

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
I=lambda:map(int,input().split());F=1<<65;r=range;n,m=I();f=[-F,F];X=set([0]+f);Y=set(X);R=[(f,F),(f,-F)];H=[(F,f),(-F,f)]
for i in r(n):a,b,c=I();R+=[((a,b),c)];Y.add(c);X.add(a);X.add(b)
for i in r(m):a,b,c=I();H+=[(a,(b,c))];X.add(a);Y.add(b);Y.add(c)
s=dict(enumerate(sorted(X)));K=len(s);t=dict(enumerate(sorted(Y)));L=len(t);h=dict(zip(s.values(),s.keys()));w=dict(zip(t.values(),t.keys()));V=[[0]*-~K for i in r(L+1)];U=[i[:]for i in V];v=[i[:]for i in V]
for(a,b),c in R:U[w[c]][h[a]]+=1;U[w[c]][h[b]]+=-1
for i in r(L+1):
 for j in r(K):U[i][j+1]+=U[i][j]
for d,(e,f)in H:V[w[e]][h[d]]+=1;V[w[f]][h[d]]+=-1
for j in r(K+1):
 for i in r(L):V[i+1][j]+=V[i][j]
q=[(h[0],w[0])];v[w[0]][h[0]]=1;a=0
while q:
 x,y=q.pop();a+=(s[x]-s[x+1])*(t[y]-t[y+1])
 for e,f in[(-1,0),(1,0),(0,1),(0,-1)]:
  c=x+e;d=y+f
  if(0<=c<K)*(0<=d<L)*(v[d][c]==0)*(U[-~f//2+y][x]==0if f!=0else V[y][-~e//2+x]==0):q+=[(c,d)];v[d][c]=1
if a>F:a='INF'
print(a)

Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Runtime Error):
I=lambda:[int(i) for i in input().split()]

ans=0
inf=1<<65
n,m=I()
X=set([0,inf,-inf])
Y=set([0,inf,-inf])
R=[]
H=[]
for i in range(n):
    a,b,c=I()
    R.append(((a,b),c))
    Y.add(c)
    X.add(a)
    X.add(b)
 
n+=2
R.append(((-inf,inf),inf))
R.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=I()
    H.append((a,(b,c)))
    X.add(a)
    Y.add(b)
    Y.add(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))

xdc={}
c=1
for j in sorted(X):
    xdc[c]=j
    c+=1
nx=c-1
 
ydc={}
c=1
for j in sorted(Y):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.Ralues(),xdc.keys()))
ydcr=dict(zip(ydc.Ralues(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[i[:]for i in mpy]

for (a,b),c in R:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]

R=[[0]*(nx+1) for i in range(ny+1)]
q=[(xdcr[0],ydcr[0])]
R[ydcr[0]][xdcr[0]]=1

while q:
    cx,cy=q.pop()
    ans+=(xdc[cx]-xdc[cx+1])*(ydc[cy]-ydc[cy+1])
    for dx,dy in [(-1,0),(1,0),(0,1),(0,-1)]:
        nbx=cx+dx
        nby=cy+dy
        if (0>nbx>=nx)or(0>nby>=ny)or R[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[-~dy//2+cy][cx]==0:
                q.append((nbx,nby))
                R[nby][nbx]=1
        else:
            if mpy[cy][-~dx//2+cx]==0:
                q.append((nbx,nby))
                R[nby][nbx]=1
if ans>=inf:
    ans='INF'
print(ans)


Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Runtime Error):
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():*a,=map(int,open(0))
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()
 
class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<70
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)

n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))

for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)

m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))


X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1

Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1

xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))

mp=[[0]*(2*nx+2) for i in range(2*ny+2)]
mpx=[[0]*(2*nx+2) for i in range(2*ny+2)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]

XX=X+[inf]
for (a,b),c in V:
    a=XX[bisect.bisect(X,a-0.5)]
    b=XX[bisect.bisect_left(X,b)]
    mpx[ydcr[c]*2][xdcr[a]*2]+=1
    mpx[ydcr[c]*2][xdcr[b]*2+1]+=-1
for i in range(0,2*ny+2,2):
    for j in range(2*nx+1):
        mpx[i][j+1]+=mpx[i][j]

YY=Y+[inf]
for d,(e,f) in H:
    e=YY[bisect.bisect(Y,e-0.5)]
    f=YY[bisect.bisect_left(Y,f)]
    
    mp[ydcr[e]*2][xdcr[d]*2]+=1
    mp[ydcr[f]*2+1][xdcr[d]*2]+=-1
for j in range(0,2*nx+2,2):
    for i in range(2*ny+1):
        mp[i+1][j]+=mp[i][j]

for i in range(2*ny+2):
    for j in range(2*nx+2):
        mp[i][j]|=mpx[i][j]



v=[[0]*(2*nx+2) for i in range(2*ny+2)]
q=deque()
q.append((2*xdcr[0]+1,2*ydcr[0]+1))
v[2*ydcr[0]+1][2*xdcr[0]+1]=1
while q:
    cx,cy=q.popleft()
    px,py=cx>>1,cy>>1
    
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px-1])*(ydc[py]-ydc[py-1]),(xdc[px],xdc[px-1]),(ydc[py],ydc[py-1]))
    #show((cx,cy),px,py)
    for dx,dy in FourNb:
        nbx=cx+dx*2
        nby=cy+dy*2
        if (not 0<=nbx<2*nx+2) or (not 0<=nby<2*ny+2) or v[nby][nbx]==1:
            continue
        
        if mp[nby-dy][nbx-dx]==0:
            q.append((nbx,nby))
            v[nby][nbx]=1

if ans>=inf:
    ans='INF'
print(ans)



Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
import sys
from collections import deque
def I():return int(input())
def LI():return [int(i) for i in input().split()]

def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
mo=10**9+7
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)

n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))

for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)

m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))


X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1

Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1

xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))

mp=[[0]*(2*nx+2) for i in range(2*ny+2)]
mpx=[[0]*(2*nx+2) for i in range(2*ny+2)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]

for (a,b),c in V:
    mpx[ydcr[c]*2][xdcr[a]*2]+=1
    mpx[ydcr[c]*2][xdcr[b]*2+1]+=-1
for i in range(0,2*ny+2,2):
    for j in range(2*nx+1):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mp[ydcr[e]*2][xdcr[d]*2]+=1
    mp[ydcr[f]*2+1][xdcr[d]*2]+=-1
for j in range(0,2*nx+2,2):
    for i in range(2*ny+1):
        mp[i+1][j]+=mp[i][j]

for i in range(0,2*ny+2,2):
    for j in range(2*nx+2):
        mp[i][j]|=mpx[i][j]


v=[[0]*(2*nx+2) for i in range(2*ny+2)]
q=deque()
q.append((2*xdcr[0]+1,2*ydcr[0]+1))
v[2*ydcr[0]+1][2*xdcr[0]+1]=1
while q:
    cx,cy=q.popleft()
    px,py=cx>>1,cy>>1
    
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px-1])*(ydc[py]-ydc[py-1]),(xdc[px],xdc[px-1]),(ydc[py],ydc[py-1]))
    #show((cx,cy),px,py)
    for dx,dy in FourNb:
        nbx=cx+dx*2
        nby=cy+dy*2
        if (not 0<=nbx<2*nx+2) or (not 0<=nby<2*ny+2) or v[nby][nbx]==1:
            continue
        
        if mp[nby-dy][nbx-dx]==0:
            q.append((nbx,nby))
            v[nby][nbx]=1

if ans>=inf:
    ans='INF'
print(ans)



Fixed submission:
import sys,bisect,string,math,time,functools,random,fractions
from heapq import heappush,heappop,heapify
from collections import deque,defaultdict,Counter
from itertools import permutations,combinations,groupby
def Golf():n,*t=map(int,open(0).read().split())
def I():return int(input())
def S_():return input()
def IS():return input().split()
def LS():return [i for i in input().split()]
def LI():return [int(i) for i in input().split()]
def LI_():return [int(i)-1 for i in input().split()]
def NI(n):return [int(input()) for i in range(n)]
def NI_(n):return [int(input())-1 for i in range(n)]
def StoLI():return [ord(i)-97 for i in input()]
def ItoS(n):return chr(n+97)
def LtoS(ls):return ''.join([chr(i+97) for i in ls])
def GI(V,E,ls=None,Directed=False,index=1):
    org_inp=[];g=[[] for i in range(V)]
    FromStdin=True if ls==None else False
    for i in range(E):
        if FromStdin:
            inp=LI()
            org_inp.append(inp)
        else:
            inp=ls[i]
        if len(inp)==2:
            a,b=inp;c=1
        else:
            a,b,c=inp
        if index==1:a-=1;b-=1
        aa=(a,c);bb=(b,c);g[a].append(bb)
        if not Directed:g[b].append(aa)
    return g,org_inp
def GGI(h,w,search=None,replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1):
#h,w,g,sg=GGI(h,w,search=['S','G'],replacement_of_found='.',mp_def={'#':1,'.':0},boundary=1) # sample usage
    mp=[boundary]*(w+2);found={}
    for i in range(h):
        s=input()
        for char in search:
            if char in s:
                found[char]=((i+1)*(w+2)+s.index(char)+1)
                mp_def[char]=mp_def[replacement_of_found]
        mp+=[boundary]+[mp_def[j] for j in s]+[boundary]
    mp+=[boundary]*(w+2)
    return h+2,w+2,mp,found
def TI(n):return GI(n,n-1)
def bit_combination(n,base=2):
    rt=[]
    for tb in range(base**n):s=[tb//(base**bt)%base for bt in range(n)];rt+=[s]
    return rt
def gcd(x,y):
    if y==0:return x
    if x%y==0:return y
    while x%y!=0:x,y=y,x%y
    return y
def show(*inp,end='\n'):
    if show_flg:print(*inp,end=end)
 
YN=['YES','NO'];Yn=['Yes','No']
mo=10**9+7
inf=float('inf')
FourNb=[(-1,0),(1,0),(0,1),(0,-1)];EightNb=[(-1,0),(1,0),(0,1),(0,-1),(1,1),(-1,-1),(1,-1),(-1,1)];compas=dict(zip('WENS',FourNb));cursol=dict(zip('LRUD',FourNb))
l_alp=string.ascii_lowercase
#sys.setrecursionlimit(10**7)
input=lambda: sys.stdin.readline().rstrip()

class Tree:
    def __init__(self,inp_size=None,ls=None,init=True,index=0):
        self.LCA_init_stat=False
        self.ETtable=[]
        if init:
            if ls==None:
                self.stdin(inp_size,index=index)
            else:
                self.size=len(ls)+1
                self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def stdin(self,inp_size=None,index=1):
        if inp_size==None:
            self.size=int(input())
        else:
            self.size=inp_size
        self.edges,_=GI(self.size,self.size-1,index=index)
        return
    
    def listin(self,ls,index=0):
        self.size=len(ls)+1
        self.edges,_=GI(self.size,self.size-1,ls,index=index)
        return
 
    def __str__(self):
        return  str(self.edges)
 
    def dfs(self,x,func=lambda prv,nx,dist:prv+dist,root_v=0):
        q=deque()
        q.append(x)
        v=[-1]*self.size
        v[x]=root_v
        while q:
            c=q.pop()
            for nb,d in self.edges[c]:
                if v[nb]==-1:
                    q.append(nb)
                    v[nb]=func(v[c],nb,d)
        return v
 
    def EulerTour(self,x):
        q=deque()
        q.append(x)
        self.depth=[None]*self.size
        self.depth[x]=0
        self.ETtable=[]
        self.ETdepth=[]
        self.ETin=[-1]*self.size
        self.ETout=[-1]*self.size
        cnt=0
        while q:
            c=q.pop()
            if c<0:
                ce=~c
            else:
                ce=c
                for nb,d in self.edges[ce]:
                    if self.depth[nb]==None:
                        q.append(~ce)
                        q.append(nb)
                        self.depth[nb]=self.depth[ce]+1
            self.ETtable.append(ce)
            self.ETdepth.append(self.depth[ce])
            if self.ETin[ce]==-1:
                self.ETin[ce]=cnt
            else:
                self.ETout[ce]=cnt
            cnt+=1
        return
    
    def LCA_init(self,root):
        self.EulerTour(root)
        self.st=SparseTable(self.ETdepth,init_func=min,init_idl=inf)
        self.LCA_init_stat=True
        return
    
    def LCA(self,root,x,y):
        if self.LCA_init_stat==False:
            self.LCA_init(root)
        xin,xout=self.ETin[x],self.ETout[x]
        yin,yout=self.ETin[y],self.ETout[y]
        a=min(xin,yin)
        b=max(xout,yout,xin,yin)
        id_of_min_dep_in_et=self.st.query_id(a,b+1)
        return self.ETtable[id_of_min_dep_in_et]
 
class SparseTable: # O(N log N) for init, O(1) for query(l,r)
    def __init__(self,ls,init_func=min,init_idl=float('inf')):
        self.func=init_func
        self.idl=init_idl
        self.size=len(ls)
        self.N0=self.size.bit_length()
        self.table=[ls[:]]
        self.index=[list(range(self.size))]
        self.lg=[0]*(self.size+1)
        
        for i in range(2,self.size+1):
            self.lg[i]=self.lg[i>>1]+1
 
        for i in range(self.N0):
            tmp=[self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) for j in range(self.size)]
            tmp_id=[self.index[i][j] if self.table[i][j]==self.func(self.table[i][j],self.table[i][min(j+(1<<i),self.size-1)]) else self.index[i][min(j+(1<<i),self.size-1)] for j in range(self.size)]
            self.table+=[tmp]
            self.index+=[tmp_id]
    
    # return func of [l,r)
    def query(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        return self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))])
    
    # return index of which val[i] = func of v among [l,r)
    def query_id(self,l,r):
        if r>self.size:r=self.size
        #N=(r-l).bit_length()-1
        N=self.lg[r-l]
        a,b=self.index[N][l],self.index[N][max(0,r-(1<<N))]
        if self.table[0][a]==self.func(self.table[N][l],self.table[N][max(0,r-(1<<N))]):
            b=a
        return b
    
    def __str__(self):
        return str(self.table[0])
 
    def print(self):
        for i in self.table:
            print(*i)
 
class Comb:
    def __init__(self,n,mo=10**9+7):
        self.fac=[0]*(n+1)
        self.inv=[1]*(n+1)
        self.fac[0]=1
        self.fact(n)
        for i in range(1,n+1):
            self.fac[i]=i*self.fac[i-1]%mo
            self.inv[n]*=i
            self.inv[n]%=mo
        self.inv[n]=pow(self.inv[n],mo-2,mo)
        for i in range(1,n):
            self.inv[n-i]=self.inv[n-i+1]*(n-i+1)%mo
        return
    
    def fact(self,n):
        return self.fac[n]
        
    def invf(self,n):
        return self.inv[n]
 
    def comb(self,x,y):
        if y<0 or y>x:
            return 0
        return self.fac[x]*self.inv[x-y]*self.inv[y]%mo

def dijkstra(edge,st):
    # edge=[[(v_to,dist_to_v),...],[],...]
    # initialize: def: d=dist(st,i), prev=[previous vertex in minimum path], q[]
    n=len(edge)
    d=[(0 if st==i else inf) for i in range(n)]
    prev=[0]*n
    q=[(j,i) for i,j in enumerate(d)]
    heapify(q)
    v=[False]*n
    # calc
    while q:
        dist,cur=heappop(q)
        if v[cur]:
            continue
        v[cur]=True
        for dst,dist in edge[cur]:
            alt=d[cur]+dist
            if alt<d[dst]:
                d[dst]=alt
                prev[dst]=cur
                heappush(q,(alt,dst))
    return d,prev


show_flg=False
show_flg=True
ans=0
inf=1<<65
n,m=LI()
X=[0,inf,-inf]
Y=[0,inf,-inf]
V=[]
H=[]
for i in range(n):
    a,b,c=LI()
    V.append(((a,b),c))
    Y.append(c)
    X.append(a)
    X.append(b)
 
n+=2
V.append(((-inf,inf),inf))
V.append(((-inf,inf),-inf))
 
for i in range(m):
    a,b,c=LI()
    H.append((a,(b,c)))
    X.append(a)
    Y.append(b)
    Y.append(c)
 
m+=2
H.append((inf,(-inf,inf)))
H.append((-inf,(-inf,inf)))
 
 
X.sort()
xdc={}
c=1
for j in sorted(set(X)):
    xdc[c]=j
    c+=1
nx=c-1
 
Y.sort()
ydc={}
c=1
for j in sorted(set(Y)):
    ydc[c]=j
    c+=1
ny=c-1
 
xdcr=dict(zip(xdc.values(),xdc.keys()))
ydcr=dict(zip(ydc.values(),ydc.keys()))
 
mpy=[[0]*(nx+1+1) for i in range(ny+1+1)]
mpx=[[0]*(nx+1+1) for i in range(ny+1+1)]
#mpy=[[0]*(2*nx+2) for i in range(2*ny+2)]
 
for (a,b),c in V:
    mpx[ydcr[c]][xdcr[a]]+=1
    mpx[ydcr[c]][xdcr[b]]+=-1
for i in range(ny+1):
    for j in range(nx):
        mpx[i][j+1]+=mpx[i][j]
        
for d,(e,f) in H:
    mpy[ydcr[e]][xdcr[d]]+=1
    mpy[ydcr[f]][xdcr[d]]+=-1
for j in range(nx+1):
    for i in range(ny):
        mpy[i+1][j]+=mpy[i][j]


v=[[0]*(nx+1) for i in range(ny+1)]
q=deque()
q.append((xdcr[0],ydcr[0]))
v[ydcr[0]][xdcr[0]]=1


while q:
    cx,cy=q.popleft()
    px,py=cx,cy
    ans+=(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1])
    #show((cx,cy),(xdc[px]-xdc[px+1])*(ydc[py]-ydc[py+1]))
    for dx,dy in FourNb:
        nbx=cx+dx
        nby=cy+dy
        if (not 0<=nbx<nx) or (not 0<=nby<ny) or v[nby][nbx]==1:
            continue
        if dy!=0:
            if mpx[cy+(dy+1)//2][cx]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
        else:
            if mpy[cy][cx+(dx+1)//2]==0:
                q.append((nbx,nby))
                v[nby][nbx]=1
 
if ans>=inf:
    ans='INF'
print(ans)