#include <iostream>
using namespace std;
int main()
{
    int n, x, y, num;
    cin >> n;
    for (int i = 0; i < n; i ++ )
    {
        num = 0;
        cin >> x >> y;
        if (x > y)
        {
            int t = x;
            x = y;
            y = t;
        }
        for(int j = x + 1; j < y; j ++ )
            if (j % 2 == 1 || j % 2 == -1)
                num += j;
        cout << num << endl;
    }
    return 0;
}