1099.py

N = int(input())
target_number = 0

for target_number in range (1, N + 1):

    number = input().split()
    x, y = number
    x, y = int(x), int(y)

    result = 0

    if x == y:
        result = 0

    if x > y:
        for target_number in range(int(y) + 1, int(x)):
            if target_number % 2 != 0:
                result += target_number

    if x < y:
        for target_number in range(int(x) + 1, int(y)):
            if target_number % 2 != 0:
                result += target_number

    print(result)