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  1. #include <bits/stdc++.h>
  2. using namespace std ;
  3. int main(){
  4.     long long n , k ;
  5.     cin >> n >> k ;
  6.     long long le = n - n / 2 ;
  7.     long long div4 = n / 4 ;
  8.     long long du2 = n / 2 - div4 ;
  9.     long long kotm = ( le * le ) + ( 2 * le * du2 ) ;
  10.     long long ans = n * n ;
  11.     long long tm = ans - kotm ;
  12.     if ( tm < k )
  13.         cout << 0 << endl ;
  14.     else
  15.         cout << kotm + k << endl ;
  16. }
  17.  
Success #stdin #stdout 0s 5312KB
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7581120826207216128
https://ideone.com/gdCbdK
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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