func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     int x, y;     while (t--) {       cin >> x >> y;       if (y <= sqrt(x)) {         if (x % 2 == 0 && y % 2 == 0)           cout <<  YES  << endl;         else if (x % 2 == 1 && y % 2 == 1)           cout <<  YES  << endl;         else           cout <<  NO  << endl;       } else         cout <<  NO  << endl;     }   }   