Submission #1113931

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113931		Dan4Life	Power Plant (JOI20_power)	C++17	100 / 100	127 ms	34500 KiB

power

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)
const int N = (int)2e5+2;
int n;
string gen;
vector<int> adj[N];
int dp[N], ans;

int dfs(int s, int p){
	vector<int> v; v.clear();
	for(auto u : adj[s]){
		if(u==p) continue;
		dfs(u,s); v.pb(dp[u]);
	}
	int sum = 0, best = 0, ok = (gen[s]=='1');
	for(auto u : v) sum+=u, best=max(best,u);
	ans = max({ans, sum-ok, best+ok});
	dp[s] = max(ok,sum-ok); return ans;
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n;
	for(int i = 1; i < n; i++){
		int a, b; cin >> a >> b;
		adj[a].pb(b), adj[b].pb(a);
	}
	cin >> gen; gen='$'+gen;
	cout << dfs(1,-1) << "\n";
}

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