using System;

public class Program

{

    public static void Main()

    {

int N =Convert.ToInt32(Console.ReadLine());

        string[] V;

        int aux2, X, Y, soma=0; 

        for (int x =0; x <N; x++){

            V = Console.ReadLine().Split(' ');

            X = int.Parse(V[0]);

            Y = int.Parse(V[1]);

            if(X>Y){

            aux2= X;

            X=Y;

            Y=aux2;

            }   

            for (int aux = X+1; aux <Y; aux++){

                if (aux%2!=0){

                 soma += aux;

                }

                }

                Console.WriteLine(soma);

                soma=0;

    }

    }

}