제출 #1029553

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1029553		12345678	Teleporters (IOI08_teleporters)	C++17	80 / 100	157 ms	31688 KiB

teleporters

#include <bits/stdc++.h>

using namespace std;

const int nx=1e6+5;

int n, m, u, v, mp[2*nx], p[2*nx], res, vs[2*nx], st, lst=-1, cnt[nx];

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m;
    for (int i=1; i<=n; i++) cin>>u>>v, mp[u]=i, mp[v]=i+n;
    for (int i=2000000; i>=0; i--)
    {
        if (!mp[i]) continue;
        //cout<<"here "<<i<<' '<<mp[i]<<' '<<lst<<'\n';
        if (mp[i]>n) p[mp[i]-n]=lst;
        else p[mp[i]+n]=lst;
        lst=mp[i];
    }
    //for (int i=1; i<=2*n; i++) cout<<i<<' '<<p[i]<<'\n';
    st=lst;
    //cout<<"st "<<st<<'\n';
    //return 0;
    while (st!=-1) vs[st]=1, res++, st=p[st];
    for (int i=1; i<=2*n; i++)
    {
        if (!vs[i])
        {
            int sz=1, tmp=i;
            while (p[tmp]!=i) vs[tmp]=1, sz++, tmp=p[tmp];
            vs[tmp]=1;
            cnt[sz]++;
        }
    }
    vector<int> pv;
    for (int i=1; i<=n; i++) while (cnt[i]-->0) pv.push_back(i);
    while (m>0&&!pv.empty()) res+=pv.back()+2, pv.pop_back(), m--;
    res+=2*m;
    if (m%2) res--;
    cout<<res;
}

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