Harryxun/testdata huggingface dataset:
Buggy python submission (verdict: Runtime Error):
s=input()
t=input()
ans=""
k=0
l=0
for i in range(len(s)):
    x=i+k
    y=0
    if x>=len(s):
        break
    if s[i+k]==t[0]:
        for j in range(len(t)):
            if (s[x+j]==t[j] or s[x+j]=="?")and x+j<len(s):
                y+=1
            else:
                break
        if y==len(t):
            ans+=t
            k+=len(t)-1
            l=1
        
    else:
        ans+=s[i+k]

ans=ans.replace("?","a")  
if l==1:
    print(ans)    
else:
    print("UNRESTORABLE")

Fixed submission:
s=input()
t=input()

ls=len(s)
lt=len(t)

def f(a,b):
    r=""
    for i in range(lt):
        if a[i]==b[i] or a[i]=="?":
            r+=b[i]
        else:
            return False
    return True
        
ans=[]

for i in range(ls-lt+1):
    c=""
    if f(s[i:i+lt],t):
        c+=s[0:i]
        c+=t
        c+=s[i+lt:ls]
        c=c.replace("?","a")
        ans.append(c)

if ans==[]:
    print("UNRESTORABLE")
else:
    print(min(ans))

Buggy python submission (verdict: Runtime Error):
s=input()
t=input()
ans=""
k=0
l=0
for i in range(len(s)):
    x=i+k
    y=0
    if x>=len(s):
        break
    if s[i+k]==t[0]:
        for j in range(len(t)):
            if (s[x+j]==t[j] or s[x+j]=="?")and x+j<len(s):
                y+=1
            else:
                break
        if y==len(t):
            ans+=t
            k+=len(t)
            l=1
        
    else:
        ans+=s[i]

ans=ans.replace("?","a")  
if l==1:
    print(ans)    
else:
    print("UNRESTORABLE")

Fixed submission:
s=input()
t=input()

ls=len(s)
lt=len(t)

def f(a,b):
    r=""
    for i in range(lt):
        if a[i]==b[i] or a[i]=="?":
            r+=b[i]
        else:
            return False
    return True
        
ans=[]

for i in range(ls-lt+1):
    c=""
    if f(s[i:i+lt],t):
        c+=s[0:i]
        c+=t
        c+=s[i+lt:ls]
        c=c.replace("?","a")
        ans.append(c)

if ans==[]:
    print("UNRESTORABLE")
else:
    print(min(ans))
Buggy python submission (verdict: Time Limit Exceeded):
n,k=map(int,input().split())
xy=[]
x=[]
y=[]
ans=10**100
for i in range(n):
    tmp=[int(j) for j in input().split()]
    xy.append(tmp)
    x.append(tmp[0])
    y.append(tmp[1])

import itertools
for xx in itertools.combinations(x,2):
    for yy in itertools.combinations(y,2):
        p=0
        for i,j in xy:
            if min(xx)<=i and i<=max(xx) and min(yy)<=j and j<=max(yy):
                p+=1
        if p==k:
            ans=min(ans,(max(xx)-min(xx))*(max(yy)-min(yy)))
print(ans)



Fixed submission:
n,k=map(int,input().split())
xy=[]
for i in range(n):
    tmp=[int(j) for j in input().split()]
    xy.append((tmp[0],tmp[1]))
from operator import itemgetter
xy.sort(key=itemgetter(1))
xy.sort(key=itemgetter(0))
xy=tuple(xy)
l=tuple(enumerate(xy))
ans=10**100
for i,(a,b) in l[:n-k+1]:
    for j,(c,d) in l[i+k-1:]:
        l1=sorted(y for x,y in xy[i:j+1])
        l2=l1[k-1:]
        for p,q in zip(l1,l2):
            if p<=b and q>=d:
                ans=min(ans,(c-a)*(q-p))
print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
a,b,c,d,e,f=map(int, input().split())
 
W=[100*a*x + 100*b*y for x in range(0,31) for y in range(0,31) if 0<(100*a*x+100*b*y)<=f]
S=[c*x+d*y for x in range(0,3001) for y in range(0,3001) if 0<(c*x+d*y)<=f]
 
dense = 0
sugar = 0
mass = 100*a
for w in W:
    for s in S:
        if (w+s<=f and s<=(w*e/100) and dense*(s+w)<s):
            dense=s/(s+w)
            sugar=s
            mass=s+w
print(mass,sugar)

Fixed submission:
a,b,c,d,e,f=map(int, input().split())
 
W=[100*a*x + 100*b*y for x in range(0,31) for y in range(0,31) if 0<(100*a*x+100*b*y)<=f]
S=[c*x+d*y for x in range(0,3001) for y in range(0,3001) if 0<(c*x+d*y)<=f]
 
dense = 0
sugar = 0
mass = 100*a
for w in W:
    for s in S:
        if (w+s<=f and s<=(w*e/100) and dense*(s+w)<s):
            dense=s/(s+w)
            sugar=s
            mass=s+w
print(mass,sugar)
Buggy python submission (verdict: Time Limit Exceeded):
import sys
input = sys.stdin.readline
n=int(input())
d=[]
ans=0
for i in range(n):
    tmp=[int(j) for j in input().split()]
    d.append(tmp)
for i in range(n):
    for j in range(i+1,n):
        ans+=d[i][j]

for i in range(n):
    for j in range(i+1,n):
        for k in range(n):
            if i==k or j==k:
                continue
            if d[i][j]>d[i][k]+d[k][j]:
                print(-1)
                exit()
            elif d[i][j]==d[i][k]+d[k][j]:
                ans-=d[i][j]
                break
print(ans)


Fixed submission:
n=int(input())
d=[]
ans=0
for i in range(n):
    tmp=[int(j) for j in input().split()]
    d.append(tmp)
for i in range(n):
    for j in range(i+1,n):
        ans+=d[i][j]

for i in range(n):
    for j in range(i+1,n):
        for k in range(n):
            if i==k or j==k:
                continue
            if d[i][j]>d[i][k]+d[k][j]:
                print(-1)
                exit()
            elif d[i][j]==d[i][k]+d[k][j]:
                ans-=d[i][j]
                break
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
d=[]
ans=0
for i in range(n):
    tmp=[int(j) for j in input().split()]
    d.append(tmp)
for i in range(n):
    for j in range(i+1,n):
        ans+=d[i][j]

for i in range(n):
    for j in range(i+1,n):
        for k in range(n):
            if i==k or j==k:
                continue
            if d[i][j]>d[i][k]+d[k][j]:
                print(-1)
                exit()
            elif d[i][j]==d[i][k]+d[k][j]:
                ans-=d[i][j]
                break
print(ans)


Fixed submission:
n=int(input())
d=[]
ans=0
for i in range(n):
    tmp=[int(j) for j in input().split()]
    d.append(tmp)
for i in range(n):
    for j in range(i+1,n):
        ans+=d[i][j]

for i in range(n):
    for j in range(i+1,n):
        for k in range(n):
            if i==k or j==k:
                continue
            if d[i][j]>d[i][k]+d[k][j]:
                print(-1)
                exit()
            elif d[i][j]==d[i][k]+d[k][j]:
                ans-=d[i][j]
                break
print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
n,m,R=map(int,input().split())
r=[int(i) for i in input().split()]
inputs=[]
d=[[10**100 for i in range(n+1)] for i in range(n+1)]
for i in range(m):
    a,b,c=map(int,input().split())
    d[a][b]=c
    d[b][a]=c

def warshall_floyd(d):
    #d[i][j]: iからjへの最短距離
    for k in range(n+1):
        for i in range(n+1):
            for j in range(n+1):
                d[i][j] = min(d[i][j],d[i][k] + d[k][j])
    return d
d=warshall_floyd(d)
ans=10**100
import itertools
for x in itertools.permutations(r):
    p=0
    for i in range(1,R):
        p+=d[x[i-1]][x[i]]
    ans=min(ans,p)
print(ans)

Fixed submission:
n,m,R=map(int,input().split())
r=[int(i) for i in input().split()]
inputs=[]
d=[[10**100 for i in range(n+1)] for i in range(n+1)]
for i in range(m):
    a,b,c=map(int,input().split())
    d[a][b]=c
    d[b][a]=c

def warshall_floyd(d):
    #d[i][j]: iからjへの最短距離
    for k in range(n+1):
        for i in range(n+1):
            for j in range(n+1):
                d[i][j] = min(d[i][j],d[i][k] + d[k][j])
    return d
d=warshall_floyd(d)
ans=10**100
import itertools
for x in itertools.permutations(r):
    p=0
    for i in range(1,R):
        p+=d[x[i-1]][x[i]]
    ans=min(ans,p)
print(ans)
Buggy python submission (verdict: Runtime Error):
n=int(input())
p=[int(i) for i in input().split()]

ans=0

if p[0]==1:
    ans+=1
    p[1]=1

for i in range(1,n):
    if p[i]==i+1:
        if p[i-1]==i:
            ans+=1
            p[i]=i
        else:
            if p[i+1]!=i+2:
                ans+=1
                p[i]=p[i-1]

print(ans)

Fixed submission:
n=int(input())
p=[int(i) for i in input().split()]

ans=0

if p[0]==1:
    ans+=1
    p[1]=1

for i in range(1,n):
    if p[i]==i+1:
        if p[i-1]==i:
            ans+=1
            p[i]=i
        else:
            if i+1!=n:
                if p[i+1]!=i+2:
                    ans+=1
                    p[i]=p[i-1]
            else:
                ans+=1

print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
a=[int(i) for i in input().split()]
b=[]
for i in range(n):
    if i%2==0:
        l=[a[i]]
        l.extend(b)
        b=l
        
    else:
        b.append(a[i])

if n%2==0:
    b.reverse()

for i in range(n):
    if i!=n-1:
        print(b[i],end=" ")
    else:
        print(b[i])




Fixed submission:
from collections import deque
n=int(input())
a=[int(i) for i in input().split()]
b=deque()
for i in range(n):
    if i%2==0:
        b.appendleft(a[i])
        
    else:
        b.append(a[i])

if n%2==0:
    b.reverse()

for i in range(n):
    if i!=n-1:
        print(b[i],end=" ")
    else:
        print(b[i])

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
a=[int(i) for i in input().split()]
b=[]
for i in a:
    b.append(i)
    b.reverse()

for i in range(n):
    if i!=n-1:
        print(b[i],end=" ")
    else:
        print(b[i])






Fixed submission:
from collections import deque
n=int(input())
a=[int(i) for i in input().split()]
b=deque()
for i in range(n):
    if i%2==0:
        b.appendleft(a[i])
        
    else:
        b.append(a[i])

if n%2==0:
    b.reverse()

for i in range(n):
    if i!=n-1:
        print(b[i],end=" ")
    else:
        print(b[i])
Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
a=[int(i) for i in input().split()]
al=a[0:n]
am=a[n:2*n]
ar=a[n:3*n]

import bisect
al.sort()
ls=sum(al)
ar.sort()
rs=sum(ar[0:n])
ans=ls-rs
for i in range(n):
    p=am[i]
    l=bisect.bisect_left(al,p)
    if l>i:
        ls=ls-al[i]+p
        al.insert(l,p)
    else:
        al.insert(l,p)
    r=bisect.bisect_left(ar,p)
    if r>n:
        del ar[r]
    elif r<=n:
        rs=rs-p+ar[n]
        del ar[r]
    ans=max(ans,ls-rs)

print(ans)










Fixed submission:
import heapq
n=int(input())
a=[int(i) for i in input().split()]
 
heap_left=[]
left=0
for i in range(n):
    left+=a[i]
    heapq.heappush(heap_left,a[i])
 
lst_left=[left]
for i in range(n,2*n):
    tmp=heapq.heappushpop(heap_left,a[i])
    left=left-tmp+a[i]
    lst_left+=[left]
 
heap_right=[]
right=0
for i in range(2*n,3*n):
    right+=a[i]
    heapq.heappush(heap_right,-a[i])
 
lst_right=[right]
for i in range(2*n-1,n-1,-1):
    tmp=heapq.heappushpop(heap_right,-a[i])
    right=right-(-tmp)+a[i]
    lst_right+=[right]
 

ans=-10**100
for i in range(n+1):
    ans=max(ans,lst_left[i]-lst_right[-(i+1)])
 
print (ans)
Buggy python submission (verdict: Runtime Error):
#ベルマンフォード法
import numpy as np
from scipy.sparse import csr_matrix
from scipy.sparse.csgraph import bellman_ford

n,m=map(int,input().split())
edge=np.array([input().split() for _ in range(m)],dtype=np.int64).T
graph=csr_matrix(((-edge[2],edge[:2]-1)),(n,n))

while True:
    try:
        #False->無向グラフ True->有効グラフ
        ans=bellman_ford(graph,directed=True,indices=[0])[0].astype(int)
        print(-ans[-1])
        break
    except:
        #負経路の場合
        print("inf")
        break

Fixed submission:
n,m=map(int,input().split())
abc=[]
for i in range(m):
    abc.append([int(j) for j in input().split()])
b=[float("INF")]*(n+1)
b[1]=0
for i in range(1,n+1):
    for s,t,u in abc:
        if b[t]>b[s]-u:
            b[t]=b[s]-u
            if i==n and t==n:
                print("inf")
                exit()
print(-b[-1])
Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split())
k=n
ans=0
for i in range(k):
    if m>=2:
        n-=1
        m-=2
        ans+=1

k=m
for i in range(k):
    if m>=4:
        m-=4
        ans+=1

print(ans)




Fixed submission:
n,m=map(int,input().split())

ans=0
if 2*n<=m:
    ans+=n
    n=0
    m-=2*ans
elif 1<=n and 2<=m:
    ans+=m//2
    n-=m
    m-=(m//2)*2
   

ans+=m//4

print(ans)
Buggy python submission (verdict: Time Limit Exceeded):
import numpy as np
from scipy.sparse import csr_matrix
from scipy.sparse.csgraph import dijkstra

n,m=map(int,input().split())
l=[]
for i in range(n):
    for j in input().split()[1:]:
        l.append((i,int(j)+n-1,1))
edge=np.array(l,dtype=np.int64).T
graph=csr_matrix(((edge[2],edge[:2])),(n+m,n+m))
ans=dijkstra(graph,directed=False,indices=0)
for i in ans[:n]:
    if i==float("inf"):
        print("NO")
        exit()
print("YES")

Fixed submission:
import numpy as np
from scipy.sparse import csr_matrix
from scipy.sparse.csgraph import connected_components
import sys
input=sys.stdin.readline

n,m=map(int,input().split())
l=[]
for i in range(n):
    for j in input().split()[1:]:
        l.append((i,int(j)+n-1,1))
edge=np.array(l,dtype=np.int64).T
graph=csr_matrix(((edge[2],edge[:2])),(n+m,n+m))

_,ll=connected_components(graph)

if 1 in ll[:n]:
    print("NO")
else:
    print("YES")

Buggy python submission (verdict: Time Limit Exceeded):
n,m=map(int,input().split())
l=[[]for i in range(m+1)]
par=[-1 for i in range(n)]
def root(a):
    if par[a]<0:
        return a
    else:
        return root(par[a])

def size(a):
    return -par[root(a)]

def connect(a,b):
    a=root(a)
    b=root(b)
    if a==b:
        return False
    if size(a)<size(b):
        a,b=b,a
    par[a]+=par[b]
    par[b]=a
    return True

for i in range(n):
    ll=[int(j) for j in input().split()[1:]]
    for j in ll:
        for k in l[j]:
            if root(i)!=root(k):
                connect(i,k)
        l[j].append(i)

for i in par:
    if -i==n:
        print("YES")
        exit()
print("NO")

Fixed submission:
import numpy as np
from scipy.sparse import csr_matrix
from scipy.sparse.csgraph import connected_components
import sys
input=sys.stdin.readline

n,m=map(int,input().split())
l=[]
for i in range(n):
    for j in input().split()[1:]:
        l.append((i,int(j)+n-1,1))
edge=np.array(l,dtype=np.int64).T
graph=csr_matrix(((edge[2],edge[:2])),(n+m,n+m))

_,ll=connected_components(graph)

if 1 in ll[:n]:
    print("NO")
else:
    print("YES")
Buggy python submission (verdict: Runtime Error):
n,x=map(int,input().split())
m=2*n-1
if x==1 or x==m:
    print("No")
    exit()
ll=list(range(1,2*n))
if x!=2:
    l=[x-1,x,x+1,x-2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x-2)
else:
    l=[x+1,x,x-1,x+2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x+2)

ans=[]
for i in range(len(ll)):
    if i==n-2:
        ans+=l
    ans.append(ll[i])

print("Yes")
for i in ans:
    print(i)



Fixed submission:
n,x=map(int,input().split())
m=2*n-1
if x==1 or x==m:
    print("No")
    exit()
if n==2:
    print("Yes")
    for i in [1,2,3]:
        print(i)
    exit()
ll=list(range(1,2*n))
if x!=2:
    l=[x-1,x,x+1,x-2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x-2)
else:
    l=[x+1,x,x-1,x+2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x+2)

ans=[]
for i in range(len(ll)):
    if i==n-2:
        ans+=l
    ans.append(ll[i])
if len(ll)==n-2:
    ans+=l
print("Yes")
for i in ans:
    print(i)

Buggy python submission (verdict: Runtime Error):
n,x=map(int,input().split())
m=2*n-1
if x==1 or x==m:
    print("No")
    exit()
ll=list(range(1,2*n))
if x!=2:
    l=[x-1,x,x+1,x-2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x-2)
else:
    l=[x+1,x,x-1,x+2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x+2)

ans=[]
k=0
for i in range(len(ll)+1):
    if i==n-2:
        ans+=l
        k=-1
    else:
        ans.append(ll[i+k])

print("Yes")
for i in ans:
    print(i)



Fixed submission:
n,x=map(int,input().split())
m=2*n-1
if x==1 or x==m:
    print("No")
    exit()
if n==2:
    print("Yes")
    for i in [1,2,3]:
        print(i)
    exit()
ll=list(range(1,2*n))
if x!=2:
    l=[x-1,x,x+1,x-2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x-2)
else:
    l=[x+1,x,x-1,x+2]
    ll.remove(x-1)
    ll.remove(x)
    ll.remove(x+1)
    ll.remove(x+2)

ans=[]
for i in range(len(ll)):
    if i==n-2:
        ans+=l
    ans.append(ll[i])
if len(ll)==n-2:
    ans+=l
print("Yes")
for i in ans:
    print(i)
Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
ta=[]
t=0
a=0
ans=[[0,0]]
for i in range(n):
    p=[int(j) for j in input().split()]
    t=max(t,p[0])
    a=max(a,p[1])
    i,j=1,1
    while True:
        if p[0]*i>=t and p[1]*j>=a and p[0]*i>=ans[-1][0] and p[1]*j>=ans[-1][1]:
            ans.append([p[0]*i,p[1]*j])
            break
        i+=1
        j+=1
 
print(sum(ans[-1]))

Fixed submission:
n=int(input())
ta=[]
t=0
a=0
ans=[[1,1]]
for i in range(n):
    p=[int(j) for j in input().split()]
    i=max(ans[-1][0]//p[0],ans[-1][1]//p[1])
    while True:
        if p[0]*i>=ans[-1][0] and p[1]*i>=ans[-1][1]:
            ans.append([p[0]*i,p[1]*i])
            break
        i+=1

print(sum(ans[-1]))

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
ta=[]
t=0
a=0
ans=[[0,0]]
for i in range(n):
    p=[int(j) for j in input().split()]
    t=max(t,p[0])
    a=max(a,p[1])
    i,j=1,1
    while True:
        if p[0]*i>=t and p[1]*j>=a and p[0]*i>=ans[-1][0] and p[1]*j>=ans[-1][1]:
            ans.append([p[0]*i,p[1]*j])
            break
        i+=1
        j+=1

print(sum(ans[-1]))

Fixed submission:
n=int(input())
ta=[]
t=0
a=0
ans=[[1,1]]
for i in range(n):
    p=[int(j) for j in input().split()]
    i=max(ans[-1][0]//p[0],ans[-1][1]//p[1])
    while True:
        if p[0]*i>=ans[-1][0] and p[1]*i>=ans[-1][1]:
            ans.append([p[0]*i,p[1]*i])
            break
        i+=1

print(sum(ans[-1]))
Buggy python submission (verdict: Time Limit Exceeded):
x=input()
n=len(x)
while True:
    x=x.replace("ST","")
    if n==len(x):
        break
    else:
        n=len(x)
print(n)

Fixed submission:
x=input()
s,t=0,0
for i in x:
    if i=="S":
        s+=1
    else:
        if s>0:
            s-=1
        else:
            t+=1
print(s+t)
Buggy python submission (verdict: Time Limit Exceeded):
h,w,n=map(int,input().split())
s=set()
l=[[0,0],[1,1],[1,-1],[-1,1],[-1,-1],[0,1],[0,-1],[1,0],[-1,0]]
ans=[(h-2)*(w-2),0,0,0,0,0,0,0,0,0]
for i in range(n):
    a,b=[int(j) for j in input().split()]
    s.add((a,b))
    for i,j in l:
        if a+i>=1 and a+i<=h and b+j>=1 and b+j<=w:
            c=0
            for p,q in l:
                if a+i+p>=1 and a+i+p<=h and b+j+q>=1 and b+j+q<=w:
                    if (a+i+p,b+j+q) in s:
                        c+=1
                else:
                    c=0
                    break
            if c!=0:
                ans[c-1]-=1
                ans[c]+=1

for i in range(10):
    print(ans[i])







Fixed submission:
h,w,n=map(int,input().split())
s=set()
l=[[0,0],[1,1],[1,-1],[-1,1],[-1,-1],[0,1],[0,-1],[1,0],[-1,0]]
ans=[(h-2)*(w-2),0,0,0,0,0,0,0,0,0]
for i in range(n):
    a,b=[int(j) for j in input().split()]
    s.add((a,b))
    for i,j in l:
        if a+i>=1 and a+i<=h and b+j>=1 and b+j<=w:
            c=0
            for p,q in l:
                if a+i+p>=1 and a+i+p<=h and b+j+q>=1 and b+j+q<=w:
                    if (a+i+p,b+j+q) in s:
                        c+=1
                else:
                    c=0
                    break
            if c!=0:
                ans[c-1]-=1
                ans[c]+=1

for i in range(10):
    print(ans[i])
Buggy python submission (verdict: Runtime Error):
n,a=[int(i) for i in input().split()]
x=[int(i) for i in input().split()]
y=[i-a for i in x]
m=sum(x)+1
dp=[[0 for j in range(m*2+1)] for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(-m,1+m):
        if j-y[i-1]>=-m:
            dp[i][j]=dp[i-1][j]+dp[i-1][j-y[i-1]]
        else:
            dp[i][j]=dp[i-1][j]

print(dp[n][0]-1)


Fixed submission:
n,a=[int(i) for i in input().split()]
x=[int(i) for i in input().split()]
y=[i-a for i in x]
m=sum(x)+1
dp=[[0 for j in range(m*2+1)] for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(-m,1+m):
        if j-y[i-1]>=-m and j-y[i-1]<=1+m:
            dp[i][j]=dp[i-1][j]+dp[i-1][j-y[i-1]]
        else:
            dp[i][j]=dp[i-1][j]

print(dp[n][0]-1)
Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
s=input()
m=len(s)
mod=10**9+7
dp=[[0]*(n+1) for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(n+1):
        if j==0:
            dp[i][j]+=dp[i-1][j]+dp[i-1][j+1]
        elif j==n:
            dp[i][j]+=dp[i-1][j-1]*2
        else:
            dp[i][j]+=dp[i-1][j-1]*2+dp[i-1][j+1]
        dp[i][j]%=mod
def div(a,b):
    return (a*pow(b,mod-2,mod))%mod
print(div(dp[n][m],pow(2,m)))


Fixed submission:
n=int(input())
s=input()
m=len(s)
mod=10**9+7
dp=[[0]*(n+1) for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(n+1):
        if j==0:
            dp[i][j]+=dp[i-1][j]+dp[i-1][j+1]
        elif j==n:
            dp[i][j]+=dp[i-1][j-1]*2
        else:
            dp[i][j]+=dp[i-1][j-1]*2+dp[i-1][j+1]
        dp[i][j]%=mod
def div(a,b):
    return (a*pow(b,mod-2,mod))%mod
print(div(dp[n][m],pow(2,m)))

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
s=input()
m=len(s)
mod=10**9+7
dp=[[0]*(n+1) for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(n+1):
        if j==0:
            dp[i][j]+=dp[i-1][j]*2**j+dp[i-1][j+1]*2**(j+1)
        elif j==n:
            dp[i][j]+=dp[i-1][j-1]*2*2**(j-1)
        else:
            dp[i][j]+=dp[i-1][j-1]*2*2**(j-1)+dp[i-1][j+1]*2**(j+1)
        dp[i][j]//=2**j
        dp[i][j]%=mod

print(dp[n][m]%mod)
#print((dp[n][m]//(pow(2,m)))%mod)






Fixed submission:
n=int(input())
s=input()
m=len(s)
mod=10**9+7
dp=[[0]*(n+1) for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(n+1):
        if j==0:
            dp[i][j]+=dp[i-1][j]+dp[i-1][j+1]
        elif j==n:
            dp[i][j]+=dp[i-1][j-1]*2
        else:
            dp[i][j]+=dp[i-1][j-1]*2+dp[i-1][j+1]
        dp[i][j]%=mod
def div(a,b):
    return (a*pow(b,mod-2,mod))%mod
print(div(dp[n][m],pow(2,m)))

Buggy python submission (verdict: Time Limit Exceeded):
n=int(input())
s=input()
m=len(s)
mod=10**9+7
dp=[[0]*(n+1) for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(n+1):
        if j==0:
            dp[i][j]+=dp[i-1][j]*2**j+dp[i-1][j+1]*2**(j+1)
        elif j==n:
            dp[i][j]+=dp[i-1][j-1]*2*2**(j-1)
        else:
            dp[i][j]+=dp[i-1][j-1]*2*2**(j-1)+dp[i-1][j+1]*2**(j+1)
        dp[i][j]//=2**j
        dp[i][j]%=mod

print(dp[n][m]%mod)
#print((dp[n][m]//(pow(2,m)))%mod)






Fixed submission:
n=int(input())
s=input()
m=len(s)
mod=10**9+7
dp=[[0]*(n+1) for i in range(n+1)]
dp[0][0]=1
for i in range(1,n+1):
    for j in range(n+1):
        if j==0:
            dp[i][j]+=dp[i-1][j]+dp[i-1][j+1]
        elif j==n:
            dp[i][j]+=dp[i-1][j-1]*2
        else:
            dp[i][j]+=dp[i-1][j-1]*2+dp[i-1][j+1]
        dp[i][j]%=mod
def div(a,b):
    return (a*pow(b,mod-2,mod))%mod
print(div(dp[n][m],pow(2,m)))
Buggy python submission (verdict: Runtime Error):
N, K = map(int, input().split())
A = [int(i)-1 for i in input().split()]
l = []
d = {}
p = 0
while p not in d:
    d[p] = len(l)
    l.append(p)
    p = A[p]
if K <= len(l):
    print(l[K] + 1)
    exit()
K -= d[p]
K %= len(l) - d[p]
print(l[K + d[p]] + 1)

Fixed submission:
N, K = map(int, input().split())
A = [int(i)-1 for i in input().split()]
l = []
d = {}
p = 0
while p not in d:
    d[p] = len(l)
    l.append(p)
    p = A[p]
if K < len(l):
    print(l[K % len(l)] + 1)
    exit()
elif K == len(l):
    print(p + 1)
    exit()
K -= d[p]
K %= len(l) - d[p]
print(l[K + d[p]] + 1)