func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T>   void read(T &x) {     x = 0;     bool f = 0;     char c = getchar();     for (; !isdigit(c); c = getchar())       if (c ==  - ) f = 1;     for (; isdigit(c); c = getchar()) x = x * 10 + (c ^ 48);     if (f) x = -x;   }   long long T, n, m, k;   int main() {     read(T);     while (T--) {       read(n), read(k);       k = k * k;       if ((n & 1) != (k & 1) || k > n)         puts( NO );       else         puts( YES );     }     return 0;   }   