Submission #479373

#	Time	Username	Problem	Language	Result	Execution time	Memory
479373		lacito	Friend (IOI14_friend)	C++14	23 / 100	3 ms	332 KiB

friend

#include "friend.h"
#include <bits/stdc++.h>
using namespace std;

vector<vector<int>> g;
vector<int> par;
vector<bool> vis;

bool dfs(int v){
	vis[v] = true;
	for(int u : g[v])
		if(par[u] == -1 || (!vis[par[u]] && dfs(par[u]))) {
			par[v] = u;
			par[u] = v;
			return true;
		}
	return false;
}

// Find out best sample
int findSample(int n,int confidence[],int host[],int protocol[]){
	vector<bool> color(n);
	g.resize(n);
	for (int i = 1; i < n; i++) {
		if (protocol[i] == 0) {
			color[i] = !color[host[i]];
			g[i].push_back(host[i]);
			g[host[i]].push_back(i);
		} else {
			color[i] = color[host[i]];
			for (int u : g[host[i]]) {
				g[i].push_back(u);
				g[u].push_back(i);
			}
		}

	}
	par.assign(n, -1);
	int ans = 0;
	for (int i = 0; i < n; i++) {
		if (color[i]) continue;
		vis.assign(n, false);
		if (dfs(i)) ans++;
	}
	
	return n - ans;
}

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