Codeforces 1327A. Sum of Odd Integers Solution

 Solution in C++:

///**********ALLAH IS ALMIGHTY************///

///AH Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh 

1. #include<iostream>
2. using namespace std;
3. int main()
4. {
5. long long t,n,k;
6. cin>>t;
7. while(t--)
8. {
9. cin>>n>>k;
10. if(k*k<=n)
11. {
12. if((n+k)%2==0)
13. cout<<"YES"<<endl;
14. else
15. cout<<"NO"<<endl;
16. }
17. else
18. cout<<"NO"<<endl;
19. }
20. }