#include <iostream>
#include <algorithm>

using namespace std;

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

    while(n--)
    {
        int x, y;
        cin >> x >> y;

        int ans = 0;
        if(x > y) swap(x, y);
        for(int i = x + 1; i < y; i++)
        {
            if(i % 2 != 0) ans += i;
        }
        cout << ans << endl;
    }

    return 0;
}