#include <iostream>

using namespace std;

int main()
{
    int n;
    cin >> n;

    int x,y;

    for (int i = 1; i<=n;i++)
    {
        cin >> x >> y;
        if (x > y)
        {
            int t;
            t = x;
            x = y;
            y = t;
        }

        int sum =0;

        for (int j = x + 1;j < y; j ++)
        {
            if (j % 2 != 0 ) sum += j;
        }
        cout << sum << endl;
        sum = 0;
    }
    return 0;
}