Submission #1222425

#	Time	Username	Problem	Language	Result	Execution time	Memory
1222425		erering	Teleporters (IOI08_teleporters)	C++20	75 / 100	666 ms	131072 KiB

teleporters

#include <bits/stdc++.h>
using namespace std;
//#define int long long
const int N=2e6+5,MOD=998244353;
#define pb push_back
#define endl '\n'
vector<int> adj[N];
int sz=0;
vector<bool> vis(N);
bool flag=0;
void dfs(int node){
    if(vis[node]){
        flag=1;
        return;
    }
    sz++;
    vis[node]=1;
    for(auto i:adj[node])dfs(i);
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n,m; cin>>n>>m;
    pair<int,int> p[n];
    vector<pair<int,int>> vec;
    for(int i=0;i<n;i++){
        cin>>p[i].first>>p[i].second;
        vec.pb({p[i].first,p[i].second}); vec.pb({p[i].second,p[i].first});
    }
    vec.pb({2e18,2e18});
    sort(vec.begin(),vec.end());
    int right=0;
    for(int i=0;i<vec.size()-1;i++){
        int y=vec[i].second;
      //  while(vec[right].second>=)
        int l=0,r=vec.size()-1;
        while(l<r){
            int mid=(l+r)/2;
            if(vec[mid].first>y)r=mid;
            else l=mid+1;
        }
        adj[i].pb(l);
    }
    int ans=0;
    vector<int> nigbig;
    for(int i=0;i<vec.size()-1;i++){
        if(vis[i])continue;
        flag=0;
        sz=0;
        dfs(i);
        //cout<<i<<' '<<flag<<' '<<sz<<endl;
        if(flag)nigbig.pb(sz);
        else ans=sz-1;
    }
 //   cout<<ans<<' '<<sz<<endl;
    sort(nigbig.begin(),nigbig.end());
    for(int i=nigbig.size()-1;i>=0 && m>0;i--){
        ans+=nigbig[i]+2;
        m--;
    }
   // cout<<ans<<endl;
    ans+=m/2*4;
    if(m%2)ans++;
    cout<<ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5
• Subtask 15: 5 / 5
• Subtask 16: 0 / 5
• Subtask 17: 0 / 5
• Subtask 18: 0 / 5
• Subtask 19: 0 / 5
• Subtask 20: 0 / 5