func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1000 * 100 + 20;   int main() {     ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);     int t;     cin >> t;     while (t--) {       long long n, k;       cin >> n >> k;       if (k % 2 == n % 2 && (k * k) <= n)         cout <<  YES  << endl;       else         cout <<  NO  << endl;     }     return 0;   }   