Submission #1029543

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1029543	2024-07-21 03:45:07	12345678	Teleporters (IOI08_teleporters)	C++17	70 / 100	1058 ms	35668 KiB

teleporters

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#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[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;
        if (mp[i]>n) p[mp[i]-n]=lst;
        else p[mp[i]+n]=lst;
        lst=mp[i];
    }
    st=lst;
    while (st!=-1) vs[st]=1, res++, st=p[st];
    //for (int i=1; i<=n; i++) cout<<vs[i]<<' '<<vs[i+n]<<'\n';
    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;
 
 
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