from collections import deque
N = int(input())

for n in range(N):
    a, b, c = map(int, input().split())
    if c > a:
        a, c = c, a

    if a == b == c and a >= 3:
        print(3)
    elif  b > a > c or a > c > b:
        print(0)
    elif a > b and b == c and b >= 2:
        print(1)
    elif a == b and b > c and c >= 2:
        print(2)
    elif a == c and b > a and a >= 2:
        print(1)
    elif a == c and b < a and b >= 2:
        print(2)
    elif c >= 2:
        print(b - c + 1)
    else:
        print(-1)