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