Submission #740272

#	Time	Username	Problem	Language	Result	Execution time	Memory
740272		Ahmed57	Teleporters (IOI08_teleporters)	C++17	100 / 100	479 ms	56312 KiB

teleporters

#include <bits/stdc++.h>

using namespace std;
int tele[2000005];
int le[2000005];
bool vis[2000005];
int ans = 0;bool ss = 0;
void dfs(int i){
    ans++;vis[i] = 1;
    if(tele[i]==0){ss = 1;return ;}
    if(!vis[tele[i]])dfs(tele[i]);
}
int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int n,m;
    cin>>n>>m;
    priority_queue<int> q;
    vector<pair<int,int>> v;
    vector<pair<int,int>> te;
    for(int i = 0;i<n;i++){
        int a,b;cin>>a>>b;
        v.push_back({a,b});v.push_back({b,a});
    }
    sort(v.begin(),v.end());
    for(int i = 0;i<v.size();i++){
        le[v[i].first] = i+1;
    }
    for(int i = 0;i<v.size();i++){
        tele[i+1] = le[v[i].second]+1;
    }
    int org = 0;
    for(int i = 1;i<=2*n+1;i++){
        if(!vis[i]){
            ss = 0;ans = 0;
            dfs(i);
            if(ss){
                org = ans-1;
            }else{
                q.push(ans);
            }
        }
    }
    while(m--){
        if(q.size()==0){
            org++;q.push(1);
        }else{
            org+=q.top()+2;q.pop();
        }
    }
    cout<<org<<endl;
}

Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for(int i = 0;i<v.size();i++){
      |                   ~^~~~~~~~~
teleporters.cpp:28:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for(int i = 0;i<v.size();i++){
      |                   ~^~~~~~~~~

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