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  1. #include "bits/stdc++.h"
  2. using namespace std;
  3. long double t,n,k,ans;
  4. int main()
  5. {
  6.     cin>>t;
  7.     while(t--)
  8.     {
  9.         cin>>n>>k;
  10.  
  11.         ans=2+1.*(k-1)*2*(n-1)/k;
  12.         cout<<setprecision(15)<<ans<<"\n";
  13.     }
  14. }
Success #stdin #stdout 0s 15224KB
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https://ideone.com/k7slv4
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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