Buggy python submission (verdict: Runtime Error):
N, Q = map(int, input().split())
LV = (10**9-1).bit_length()
N0 = 2**LV
data = [10**10]*(2*N0)
lazy = [None]*(2*N0)

def gindex(l, r):
    L = l + N0; R = r + N0
    lm = (L // (L & -L)) >> 1
    rm = (R // (R & -R)) >> 1
    while L < R:
        if R <= rm:
            yield R
        if L <= lm:
            yield L
        L >>= 1; R >>= 1
    while L:
        yield L
        L >>= 1

def propagates(*ids):
    for i in reversed(ids):
        v = lazy[i-1]
        if v is None:
            continue
        lazy[2*i-1] = data[2*i-1] = lazy[2*i] = data[2*i] = v
        lazy[i-1] = None

def update(l, r, x):
    *ids, = gindex(l, r)
    propagates(*ids)

    L = N0 + l; R = N0 + r
    while L < R:
        if R & 1:
            R -= 1
            lazy[R-1] = data[R-1] = x
        if L & 1:
            lazy[L-1] = data[L-1] = x
            L += 1
        L >>= 1; R >>= 1
    for i in ids:
        data[i-1] = max(data[2*i-1], data[2*i])

def query(l, r):
    propagates(*gindex(l, r))
    L = N0 + l; R = N0 + r

    s = 0
    while L < R:
        if R & 1:
            R -= 1
            s =min(s,data[R-1])
        if L & 1:
            s =min(s,data[L-1])
            L += 1
        L >>= 1; R >>= 1
    return s

for n in range(N):
    s,t,x= map(int,input().split())
    l=x-t
    r=x-s
    if l<0 and r>=0:
        update(0, r+1, x)
    elif l>=0 and r>=0:
        update(l,r+1,x)
for j in range(Q):
    i=int(input())
    ans=query(i,i+1)
    if ans==10**10:
        print(-1)
    else:
        print(ans)


Fixed submission:
# coding: utf-8
import re
import math
import fractions
import random
from heapq import heappop,heappush
import time
import sys
input = sys.stdin.readline
#import numpy as np
mod=int(10**9+7)
inf=int(10**20)
class union_find():
    def __init__(self,n):
        self.n=n
        self.P=[a for a in range(N)]
        self.rank=[0]*n
 
    def find(self,x):
        if(x!=self.P[x]):self.P[x]=self.find(self.P[x])
        return self.P[x]
 
    def same(self,x,y):
        return self.find(x)==self.find(y)
 
    def link(self,x,y):
        if self.rank[x]<self.rank[y]:
            self.P[x]=y
        elif self.rank[y]<self.rank[x]:
            self.P[y]=x
        else:
            self.P[x]=y
            self.rank[y]+=1
 
    def unite(self,x,y):
        self.link(self.find(x),self.find(y))
 
    def size(self):
        S=set()
        for a in range(self.n):
            S.add(self.find(a))
        return len(S)
def bin_(num,size):
    A=[0]*size
    for a in range(size):
        if (num>>(size-a-1))&1==1:
            A[a]=1
        else:
            A[a]=0
    return A
def comb(n,r):return math.factorial(n)//math.factorial(n-r)//math.factorial(r)
def next_comb(num,size):
    x=num&(-num)
    y=num+x
    z=num&(~y)
    z//=x
    z=z>>1
    num=(y|z)
    if(num>=(1<<size)):return False
    else:
        return num
 

 
#main
N,Q=map(int,input().split())
E=[]
for a in range(N):
    s,t,x=map(int,input().split())
    E.append((s-x,1,x))
    E.append((t-x,0,x))

for a in range(Q):
    E.append((int(input()),2,0))
E.sort()
 
S=set()
H=[]
for time_,type_,x in E:
    if type_==1:
        S.add(x)
        heappush(H,x)
    elif type_==0:
        S.remove(x)
    else:
        while H and H[0] not in S:
            heappop(H)
        print(H[0] if H else -1)