#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-O3")
#define F first
#define S second
#define pb push_back
#define N +200500
#define M ll(1e9 + 7)
#define sz(x) (int)x.size()
#define re return
#define oo ll(1e9)
#define el '\n'
#define pii pair <int, int>
#define err ld(1e-9)
#define last(x) x.back()
#define all(x) (x.begin(), x.end())
using namespace std;
//using namespace __gnu_pbds;
//typedef tree <int, null_type, less_equal <int> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef long long ll;
typedef long double ld;
ll f[N], ans, i, n, u, v, a[N];
vector <ll> g[N];
void dfs(ll v, ll pr)
{
f[v] = (a[v] == 1) ? 1 : -1e9;
for (auto u : g[v])
{
if (u == pr) continue;
dsf(u, v);
f[v] = max(f[v], f[v] + f[u]);
}
}
int main()
{
srand(time(0));
ios_base::sync_with_stdio(0);
iostream::sync_with_stdio(0);
ios::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
// in("input.txt");
// out("output.txt");
cin >> n;
for (i = 1; i < n; i++)
{
cin >> u >> v;
g[v].pb(u);
g[u].pb(v);
}
for (i = 1; i <= n; i++) cin >> a[i];
dfs(1, -1);
ans = 1;
for (i = 1; i <= n; i++) ans = max(ans, f[i]);
cout << "1/" << ans;
}
//
//00000
//00110
//00111
//00011
//00000
Compilation message
mag.cpp: In function 'void dfs(ll, ll)':
mag.cpp:39:9: error: 'dsf' was not declared in this scope
dsf(u, v);
^~~
