#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
    int N, s, x, y;
    cin >> N;
    while (N -- ) {
        s = 0;
        cin >> x >> y;
        if (x > y) swap(x, y);
        for (++ x; x < y; x ++ ) {
            if (x % 2) s += x;
        }
        cout << s << endl;
    }


    return 0;
}