func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int t;     long long int n, k;     cin >> t;     while (t--) {       cin >> n >> k;       if (n < k * k) {         cout <<  NO  << endl;         continue;       } else {         if ((n % 2 == 1 && k % 2 == 1) || (n % 2 == 0 && k % 2 == 0))           cout <<  YES  << endl;         else           cout <<  NO  << endl;       }     }     return 0;   }   