Submission #1333943

#TimeUsernameProblemLanguageResultExecution timeMemory
1333943killerzaluuAstronomer (BOI23_astronomer)C++20
0 / 100
0 ms344 KiB
#include <bits/stdc++.h> 
using namespace std;

int main() {
  long long n,k,i; 
  double s,t;
  cin>>k>>n>>s>>t;
  
  double a[n+1], b[n+1], sad[n+1];
  
  for(i=1; i<=n; i++) {
    cin>>a[i]>>b[i];
  }
  
  if(t<=s) {
    for(i=1; i<=n; i++) {
      sad[i]=sqrt(a[i]*a[i]+b[i]*b[i]);
    }
    

    
    sort(sad+1, sad+n+1);
    
    cout<<(double) sad[n+1-k]*t<<endl;
  }
  
  
}
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