제출 #1071755

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1071755		cpdreamer	친구 (IOI14_friend)	C++14	0 / 100	1 ms	860 KiB

friend

#include "friend.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <utility>
#define V vector
#define F first
#define S second
#define P pair
#define pb push_back
#define all(v) v.begin(),v.end()
typedef long long ll;
using namespace __gnu_pbds;
using namespace std;
V<int>adj[(int)1001];
void dfs(int n,bool vis[],V<int>&vp){
    if(vis[n])return;
    vis[n]=true;
    vp.pb(n);
    for(auto u:adj[n]) {
        dfs(u, vis,vp);
    }
}
bool custom(P<int,int>a,P<int,int>b){
    return a.S<=b.S;
}
int findSample(int n,int confidence[],int host[],int protocol[]){
    for(int i=1;i<n;i++){
        if(protocol[i]==0){
            adj[host[i]].pb(i);
            adj[i].pb(host[i]);
        }
        else{
            for(auto u:adj[host[i]]){
                adj[u].pb(i);
                adj[i].pb(u);
            }
        }
    }
    bool vis[n];
    memset(vis,false,sizeof(vis));
    V<V<int>>component;
    for(int i=0;i<n;i++){
        if(!vis[i]){
            V<int>vp;
            dfs(i,vis,vp);
            component.pb(vp);
        }
    }
    int s=0;
    for(auto u:component){
        V<P<int,int>>v;
        for(auto x:u){
            v.pb({x,adj[x].size()});
        }
        sort(all(v),custom);
        set<int>st;
        for(auto x:v){
            if(st.count(x.F))continue;
            s++;
            for(auto vertex:adj[x.F]){
                st.insert(vertex);
            }
        }
    }
    return s;
}

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