#include <iostream>
#include <cstring>
#include <utility>
#include <vector>
#include <cstdio>
#include <queue>
#include <algorithm>
#include <map>
#include <cmath>
#include <complex>
#include <array>
#include <ctime>
#include <cassert>
#include <set>
#include <iomanip>
#include <random>
#include <cstdlib>
#include <chrono>
#include <bitset>

using namespace std;


long long int solve(int n, int m) {
    if (m == 0) {
        return 0;
    }
    m = min(m, n / 2);
    long long int sub = (long long int) (3 + 3 + 4 * (m - 1)) * m / 2;
    long long int add = (long long int) 2 * n * m;
    return add - sub;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t; cin >> t;
    while (t--) {
        int n, m; cin >> n >> m;
        cout << solve(n, m) << "\n";

    }

}