제출 #615021

#제출 시각아이디문제언어결과실행 시간메모리
615021cheissmart친구 (IOI14_friend)C++14
19 / 100
2 ms468 KiB
#include "friend.h"
#include <bits/stdc++.h>
#define F first
#define S second
#define V vector
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(), (v).end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pi;
typedef V<int> vi;

const int INF = 1e9 + 7, N = 1003;

vi G[N];
int dp[N][2];

int findSample(int n, int a[], int host[], int op[]) {
	for(int i = 1; i < n; i++) {
		if(op[i]) return 0; // not tree
		if(op[i] == 0) {
			G[host[i]].PB(i);
			G[i].PB(host[i]);
		} else if(op[i] == 1) {
			for(int j:G[host[i]]) {
				G[j].PB(i);
				G[i].PB(j);
			}
		} else {
			for(int j:G[host[i]]) {
				G[j].PB(i);
				G[i].PB(j);
			}
			G[host[i]].PB(i);
			G[i].PB(host[i]);
		}
	}
	function<void(int)> dfs = [&] (int u) {
		dp[u][1] += a[u];
		for(int v:G[u]) if(v > u) {
			dfs(v);
			dp[u][1] += dp[v][0];
			dp[u][0] += max(dp[v][0], dp[v][1]);
		}
	};	
	dfs(0);
	return max(dp[0][0], dp[0][1]);
}
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