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:
        if b > c + 1:
            print(1)
        elif b == c + 1 and c >= 2:
            print(2)
    elif a == c and b > a and a >= 2:
        print(1)
    elif a == c and b < a:
        if a > b + 1:
            print(1)
        if a == b + 1 and b >= 2:
            print(2)
    elif (not a == b and not b == c and not c == a) and (c >= 2 or c == 1 and b > c + 1):
        t = 10000000000
        if c >= 2:
            t = min(t, b - c + 1)
        if b > c + 1:
            t = min(t, a - b + 1)
        if t == 10000000000:
            print(-1)
        else:
            print(t)
    else:
        print(-1)