Problem p02936 (python)

Fixed submission:
from collections import deque

N, Q = map(int, input().split())
edge = [[] for i in range(N)]
ops = []
ans = [0] * N

for _ in range(N - 1):
    a, b = map(int, input().split())
    edge[a - 1].append(b - 1)
    edge[b - 1].append(a - 1)
for _ in range(Q):
    ops.append(tuple(map(int, input().split())))

for op in ops:
    node = op[0] - 1
    pnt = op[1]
    ans[node] += pnt

stack = deque()
stack.append((0, -1))

while stack:
    st = stack.pop()
    node, parent = st[0], st[1]
    children = edge[node]
    for child in children:
        if child == parent:
            continue
        ans[child] += ans[node]
        stack.append((child, node))

print(*ans)

Buggy submission (verdict: Runtime Error):
import sys
from collections import deque
sys.setrecursionlimit(10 ** 5)
input = sys.stdin.readline


def main():
    N, Q = map(int, input().split())
    ans = [[0, deque()] for _ in range(N)]

    for _ in range(N - 1):
        p, c = map(int, input().split())
        ans[p-1][1].append(c-1)
        ans[c-1][1].append(p-1)

    for _ in range(Q):
        p, v = map(int, input().split())
        ans[p-1][0] += v

    def add_value(node, parent):
        val = ans[node][0]
        children = ans[node][1]
        for child in children:
            if child == parent:
                continue
            ans[child][0] += val
            add_value(child, node)

    add_value(0, -1)

    print(' '.join([str(x[0]) for x in ans]))


if __name__ == '__main__':
    main()

Buggy submission (verdict: Runtime Error):
import sys
from collections import deque
sys.setrecursionlimit(10 ** 5)
input = sys.stdin.readline


def main():
    N, Q = map(int, input().split())
    ans = [0] * N
    con = [[0, deque()] for _ in range(N)]

    for _ in range(N - 1):
        p, c = map(int, input().split())
        con[p-1][1].append(c-1)

    for _ in range(Q):
        p, v = map(int, input().split())
        con[p-1][0] += v

    def add_value(node):
        val = con[node][0]
        for child in con[node][1]:
            con[child][0] += val
            add_value(child)

    add_value(0)

    print(' '.join([str(x[0]) for x in con]))


if __name__ == '__main__':
    main()

Buggy submission (verdict: Runtime Error):
P, n = map(int, input().split())
struct = [list(map(int, input().split())) for x in range(P-1)]
act = [list(map(int, input().split())) for y in range(n)]

A = []


def add_val(action):
    idx = action[0]
    val = action[1]

    A[idx][0] += val

    if A[idx][1]:
        for r in A[idx][1]:
            add_val([r, val])


for a in range(P + 1):
    A.append(list([0, []]))

for z in struct:
    p = z[0]
    p_ = z[1]
    A[p][1].append(p_)

for _ in act:
    add_val(_)


As = []
for _ in range(1, len(A)):
    As.append(A[_][0])

print(*As, sep=' ')

Buggy submission (verdict: Runtime Error):
P, n = map(int, input().split())
struct = [list(map(int, input().split())) for x in range(P-1)]
act = [list(map(int, input().split())) for y in range(n)]

A = []


def add_val(action):
    idx = action[0]
    val = action[1]

    A[idx][0] += val

    if A[idx][1]:
        for r in A[idx][1]:
            add_val([r, val])


for a in range(P + 1):
    A.append(list([0, []]))

for z in struct:
    p = z[0]
    p_ = z[1]
    A[p][1].append(p_)

for _ in act:
    add_val(_)


As = []
for _ in range(1, len(A)):
    As.append(A[_][0])

print(*As, sep=' ')