Submission #404155

#	Time	Username	Problem	Language	Result	Execution time	Memory
404155		bigg	Friend (IOI14_friend)	C++14	19 / 100	20 ms	2796 KiB

friend

#include "friend.h"
#include<bits/stdc++.h>
using namespace std;
// Find out best sample
const int MAXN = 1e5 + 10;
vector<int> grafo[MAXN];
int dp[MAXN][5], v[MAXN], comp[MAXN], maxc[MAXN];

void dfsc(int x, int p, int c){
	comp[x] = c;
	for(int v : grafo[x]){
		if(v == p) continue;
		dfsc(v, x, c);
	}
}

void dfs(int x, int p){
	dp[x][0] = 0, dp[x][1] = v[x];
	for(int v : grafo[x]){
		if(v == p) continue;
		dfs(v, x);
		dp[x][0] += max(dp[v][0], dp[v][1]);
		dp[x][1] += dp[v][0];
	}
}

int findSample(int n,int confidence[],int host[],int protocol[]){
	int ans= 0;
	for(int i = 0; i < n; i++) v[i] = confidence[i];
	for(int i = 1; i < n; i++){
		grafo[host[i]].push_back(i);
		grafo[i].push_back(host[i]);
	}
	int c = 0;
	for(int i = 0; i < n; i++){
		if(!comp[i]){
			dfsc(i,i, ++c);
		}
	}
	for(int i = 0; i < n; i++){
		dfs(i, i);

		maxc[comp[i]] = max(maxc[comp[i]], dp[i][1]);
	}
	for(int i = 1; i <= c; i++) ans += maxc[i];
	return ans;
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 8
• Subtask 3: 0 / 8
• Subtask 4: 19 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31