import sys
sys.setrecursionlimit(1000000000)
n = int(input())
if n==1:
print(1)
quit()
edges = [[] for i in range(n+1)]
par = [-1 for i in range(n+1)]
visited = [False for i in range(n+1)]
for i in range(n-1):
a,b = map(int, input().split())
edges[a].append(b)
edges[b].append(a)
sus = input()
root = 1
flag = False
def dfs(a):
for i in edges[a]:
if not visited[i]:
par[i] = a
visited[i] = True
dfs(i)
visited[root] = True
dfs(root)
dps = [-1 for i in range(n+1)]
used = [0 for i in range(n+1)]
ans = -1
def dp(a):
global ans
if dps[a] != -1:
return dps[a]
sum = 0
maxi = 0
for i in edges[a]:
if i == par[a]: continue
sum += dp(i)
maxi = max(maxi, dp(i))
if sus[a-1]=="1":
ans = max(ans, maxi+1, sum-1)
else:
ans = max(ans,sum)
dps[a] = max(sum-int(sus[a-1]), int(sus[a-1]))
return dps[a]
dp(root)
print(ans)
Compilation message
power.cpp:1:1: error: 'import' does not name a type
1 | import sys
| ^~~~~~
