even_pair_sum_op.cpp~

#include<iostream>
using namespace std;
int main()
{
    long long repeat,a,b,temp;
    cin>>repeat;
    while(repeat--)
    {
        cin>>a>>b;
        if(a>b)
        {
            temp=a;
            a=b;
            b=a;    
        }
        if(b%2==0)
            cout<<(b/2)*a<<endl;
        else if(b%2==1 && a%2==1)
        {
            cout<<((b/2)+(b-(b/2)))*((a/2)+(a-(a/2)))<<endl;
        }
        else
        {
            cout<<((b/2)+(b-(b/2)))*(a/2)<<endl;
        } 
    }
}