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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5.  
  6.     long long n,k;
  7.  
  8.     cin>>n>>k;
  9.  
  10.     //cout<<n/2<<"\n";
  11.     if(k<=n/2 && n%2==0){
  12.         cout<<1+(k-1)*2<<"\n";
  13.     }
  14.     else if(k<=n/2+1 && n%2==1){
  15.         cout<<1+(k-1)*2<<"\n";
  16.     }
  17.     else{
  18.         long long t;
  19.         if(n%2==0){
  20.             t = k - n/2;
  21.         }
  22.         else t = k - n/2 - 1;
  23.         cout<<2 +(t-1)*2<<"\n";
  24.     }
  25.  
  26.  
  27.  
  28. }
  29.  
  30.  
  31.  
Success #stdin #stdout 0s 3472KB
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stdin
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284911189 142190783
stdout
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284381565
https://ideone.com/mOLxML
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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