#include <cstdio>
#include <string>
#include <set>
#include <vector>
#include <algorithm>

using namespace std;
const int maxn = 200;

long long n,m;

int main()
{
    int T;
    scanf("%d",&T);
    while(T--){
        scanf("%lld%lld",&n,&m);
        //if (n&1) n--;
        m = min( m , n/2 );
        printf("%lld\n",2*n*m - m*(2*m+1) );
    }
    return 0;
}