Submission #312786

#	Time	Username	Problem	Language	Result	Execution time	Memory
312786		Jarif_Rahman	Power Plant (JOI20_power)	C++17	0 / 100	1 ms	384 KiB

power

#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;
int n; str s;
vector <vector<int>> v;
ll ans =  0;
ll dfs(int nd, int ss){
    ll r = '0'-s[nd];
    bool bl = (r==-1);
    ll mx = 0;
    if(ss == -1 && v[nd].size() == 1) r = 1;
    for(int x: v[nd]) if(x != ss){
        ll y = dfs(x, nd);
        mx = max(mx, y);
        r+=y;
    }
    if(bl) r = max(r, mx);
    return max(r, (ll)s[nd] - '0');
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    v = vector<vector<int>> (n+1);
    for(int i = 1; i < n; i++){
        int a, b; cin >> a >> b;
        v[a].pb(b);
        v[b].pb(a);
    }
    cin >> s;
    s = "x"+s;
    for(int i = 1; i <= n; i++) if(s[i] == '1') ans = max(ans, dfs(i, -1));
    cout << ans << "\n";
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 53