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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll  long long int
  4.  
  5.  
  6. ll a[300010]={0};
  7. int main()
  8. {
  9.     ll n,w,i,g,b;
  10.     cin>>n>>w;
  11.     double ans=0;
  12.  
  13.     for(i=1;i<=2*n;i++)
  14.         cin>>a[i];
  15.  
  16.     sort(a+1,a+n+n+1);
  17.     g=a[1];
  18.     b=a[n+1];
  19.  
  20.     if(b*0.5<=g)
  21.         ans=b*0.5*n+b*n;
  22.     else
  23.         ans=g*n+2*g*n;
  24.  
  25.     if(ans>w)
  26.         ans=w;
  27.     cout<<setprecision(10)<<ans<<"\n";
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0s 5448KB
comments (?)
stdin 
1 5
2 3
stdout 
4.5
https://ideone.com/1POnoF
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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