Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline
from operator import setitem

def readlines(n):
    for _ in range(n):
        a, b = map(int, input().split())
        yield a, b

def main():
    n, q = map(int, input().split())
    edges = [[] for _ in range(n+1)]

    for a, b in readlines(n-1):
        edges[a].append(b)
        edges[b].append(a)

    counter = [0] * (n+1)
    for q, x in readlines(q):
        counter[q] += x

    def dfs(u, prev):
        for v in edges[u]:
            if v == prev:
                continue
            counter[v] += counter[u]
            dfs(v, u)

    dfs(1, 0)

    print(" ".join(map(str, counter[1:])))

main()

Fixed submission:
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)

def readlines(n):
    for _ in range(n):
        a, b = map(int, input().split())
        yield a, b

def main():
    n, q = map(int, input().split())
    edges = [[] for _ in range(n+1)]

    for a, b in readlines(n-1):
        edges[a].append(b)
        edges[b].append(a)

    counter = [0] * (n+1)
    for q, x in readlines(q):
        counter[q] += x

    def dfs(u, prev):
        for v in edges[u]:
            if v == prev:
                continue
            counter[v] += counter[u]
            dfs(v, u)

    dfs(1, 0)

    print(" ".join(map(str, counter[1:])))

main()

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline
from operator import setitem

def readlines(n):
    for _ in range(n):
        a, b = map(int, input().split())
        yield a, b

def main():
    n, q = map(int, input().split())
    edges = {i: 0 for i in range(n+1)}

    bigroot = False
    for a, b in readlines(n-1):
        if not bigroot and edges[b] > 0:
            edges = {v: k for k, v in edges.items()}
            bigroot = True

        if bigroot:
            edges[a] = b
        else:
            edges[b] = a

    counter = [0] * (n+1)

    for q, x in readlines(q):
        counter[q] += x

    iterator = range(n, 0, -1) if bigroot else range(1, n+1)
    for i in iterator:
        parent = edges[i]
        counter[i] += counter[parent]

    print(" ".join(map(str, counter[1:])))

main()

Fixed submission:
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)

def readlines(n):
    for _ in range(n):
        a, b = map(int, input().split())
        yield a, b

def main():
    n, q = map(int, input().split())
    edges = [[] for _ in range(n+1)]

    for a, b in readlines(n-1):
        edges[a].append(b)
        edges[b].append(a)

    counter = [0] * (n+1)
    for q, x in readlines(q):
        counter[q] += x

    def dfs(u, prev):
        for v in edges[u]:
            if v == prev:
                continue
            counter[v] += counter[u]
            dfs(v, u)

    dfs(1, 0)

    print(" ".join(map(str, counter[1:])))

main()

Buggy python submission (verdict: Runtime Error):
import sys
input = sys.stdin.readline
from operator import setitem

def readlines(n):
    for _ in range(n):
        a, b = map(int, input().split())
        yield a, b

def main():
    n, q = map(int, input().split())
    edges = {i: 0 for i in range(n+1)}

    bigroot = False
    for a, b in readlines(n-1):
        if not bigroot and edges[b] > 0:
            edges = {v: k for k, v in edges.items()}
            bigroot = True

        if bigroot:
            edges[a] = b
        else:
            edges[b] = a

    counter = [0] * (n+1)

    for q, x in readlines(q):
        counter[q] += x

    iterator = range(n+1, 0, -1) if bigroot else range(1, n+1)
    for i in iterator:
        parent = edges[i]
        counter[i] += counter[parent]

    print(" ".join(map(str, counter[1:])))

main()

Fixed submission:
import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)

def readlines(n):
    for _ in range(n):
        a, b = map(int, input().split())
        yield a, b

def main():
    n, q = map(int, input().split())
    edges = [[] for _ in range(n+1)]

    for a, b in readlines(n-1):
        edges[a].append(b)
        edges[b].append(a)

    counter = [0] * (n+1)
    for q, x in readlines(q):
        counter[q] += x

    def dfs(u, prev):
        for v in edges[u]:
            if v == prev:
                continue
            counter[v] += counter[u]
            dfs(v, u)

    dfs(1, 0)

    print(" ".join(map(str, counter[1:])))

main()