Submission #895067

#	Time	Username	Problem	Language	Result	Execution time	Memory
895067		abcvuitunggio	Teleporters (IOI08_teleporters)	C++17	100 / 100	328 ms	59896 KiB

teleporters

#include <bits/stdc++.h>
using namespace std;
int n,m,w[1000001],e[1000001],c[2000002],p[2000002],nxt[2000002],res,vis[2000002];
priority_queue <int> q;
int main(){
    ios_base::sync_with_stdio(NULL);cin.tie(nullptr);
    cin >> n >> m;
    iota(nxt,nxt+2000001,1);
    for (int i=1;i<=n;i++){
        cin >> w[i] >> e[i];
        p[w[i]]=p[e[i]]=i;
        nxt[w[i]-1]=e[i];
        nxt[e[i]-1]=w[i];
        c[w[i]-1]=c[e[i]-1]=1;
    }
    vis[2000001]=1;
    for (int i=0;i<=2000000;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;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
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• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 5 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5