This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std ;
const int MAX = 2e5 + 10 ;
int n ;
int mark[MAX] ;
vector< vector<int> >adj(MAX) ;
int ans = 0 ;
int dp[MAX] ;
void dfs(int node , int par)
{
int cnt = 0 ;
for(auto &child : adj[node])
{
if(child == par)
continue ;
dfs(child , node) ;
cnt += dp[child] ;
if(mark[node])
ans = max(ans , dp[child] + 1) ;
}
if(mark[node])
dp[node] = max(1 , cnt - 1) ;
else
dp[node] = cnt ;
ans = max(ans , dp[node]) ;
}
int main()
{
ios_base::sync_with_stdio(0) ;
cin.tie(0) ;
cin>>n ;
for(int i = 0 ; i < n-1 ; ++i)
{
int x , y ;
cin>>x>>y ;
adj[x].push_back(y) ;
adj[y].push_back(x) ;
}
for(int i = 1 ; i <= n ; ++i)
{
char c ;
cin>>c ;
mark[i] = (c - '0') ;
}
dfs(1 , -1) ;
return cout<<ans<<"\n" , 0 ;
}
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