제출 #895072

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
895072		abcvuitunggio	Teleporters (IOI08_teleporters)	C++17	100 / 100	279 ms	29644 KiB

teleporters

#include <bits/stdc++.h>
using namespace std;
const int mx=2000001;
int n,m,w,e,c[mx+1],nxt[mx+1],res,vis[mx+1];
priority_queue <int> q;
int main(){
    ios_base::sync_with_stdio(NULL);cin.tie(nullptr);
    cin >> n >> m;
    iota(nxt,nxt+mx,1);
    for (int i=1;i<=n;i++){
        cin >> w >> e;
        nxt[w-1]=e;
        nxt[e-1]=w;
        c[w-1]=c[e-1]=1;
    }
    vis[mx]=1;
    for (int i=0;i<mx;i++){
        if (!vis[i]){
            int s=0,x=i;
            while (!vis[x]){
                s+=c[x];
                vis[x]=1;
                x=nxt[x];
            }
            if (x!=i)
                res=s;
            else
                q.push(s);
        }
    }
    while (!q.empty()&&m){
        res+=q.top()+2;
        q.pop();
        m--;
    }
    cout << res+m+m/2*2;
}

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