#include<iostream>
#include<cmath>

using namespace std;

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

    for(int i = 0;i < n;i ++)
    {
        int x, y;
        cin >> x >> y;
        if( x > y) swap( x, y);//注意x,y的大小

        if(x % 2 == 0) x = x + 1;
        else x = x + 2;

        int sum = 0;
        for(int i = x;i < y;i += 2) sum += i;

        cout << sum << endl;
    }
    return 0;
}