Submission #421038

#	Time	Username	Problem	Language	Result	Execution time	Memory
421038		faresbasbs	Friend (IOI14_friend)	C++14	0 / 100	1 ms	332 KiB

friend

#include <bits/stdc++.h>
#include "friend.h"
using namespace std;
vector<int> graph[1001];
vector<bool> used;
int n,k,val[1001];
bool which[1001];
vector<int> mt;

bool try_kuhn(int v) {
    if (used[v])
        return false;
    used[v] = true;
    for (int to : graph[v]) {
        if (mt[to] == -1 || try_kuhn(mt[to])) {
            mt[to] = v;
            return true;
        }
    }
    return false;
}

int findSample(int N , int confidence[] , int host[] , int protocol[]){
	which[0] = 0 , val[0] = 0;
	n = 1 , k = 0;
	for(int i = 1 ; i < N ; i += 1){
		if(protocol[i] == 0){
			which[i] = 1-which[host[i]];
			if(which[i] == 0){
				val[i] = n++;
				graph[val[i]].push_back(val[host[i]]);
			}else{
				val[i] = k++;
				graph[val[host[i]]].push_back(val[i]);
			}
		}else{
			which[i] = which[host[i]];
			if(which[i] == 0){
				val[i] = n++;
			}else{
				val[i] = k++;
			}
			for(auto j : graph[val[host[i]]]){
				if(which[j] == 0){
					graph[j].push_back(val[i]);
				}else{
					graph[val[i]].push_back(j);
				}
			}
		}
	}
	mt.assign(k, -1);
    vector<bool> used1(n, false);
    for (int v = 0; v < n; ++v) {
        for (int to : graph[v]) {
            if (mt[to] == -1) {
                mt[to] = v;
                used1[v] = true;
                break;
            }
        }
    }
    for (int v = 0; v < n; ++v) {
        if (used1[v])
            continue;
        used.assign(n, false);
        try_kuhn(v);
    }
    int mx = 0;
    for(int i = 0 ; i < k ; i += 1){
    	mx = max(mx,mt[i]+1);
    }
    return N-mx;
}

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