#include<stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    int x,y,j,f,z[10001] = { 0 },i;
    for(i = 0; i < n; i++)
    {
        scanf("%d%d",&x,&y);
        if (x > y)
        {
            f = x;
            x = y;
            y = f;
        }
        for (j = x + 1; j < y; j++)
        {
            if(j % 2 != 0)
            z[i] += j;
        }
    }
    for(i = 0; i < n; i++)
    printf("%d\n",z[i]);
    return 0;
}