INF = 1e18
T = int(input())
ansl = []
for i in range(T):
    cost = INF
    a, b, c = map(int, input().split())
    candi = []

    if a == c == b + 1 and b >= 2:
        ansl.append(2)
        continue

    # b をminにする
    m = min(a, c)

    if a == c:
        if a > b + 1:
            cost1 = max(0, b - (m - 2)) + 1
            if m - 2 > 0:
                candi.append(cost1)
    else:
        cost2 = max(0, b - (m - 1))
        if m - 1 > 0:
            candi.append(cost2)

    # b をmaxにする
    if b >= 3 and not(a == c == 1):
        cost3 = 0
        if a >= b - 1:
            cost3 += a - (b - 1)
            a = b - 1
        if c >= b - 1:
            cost3 += c - (b - 1)
            c = b - 1
        if a == c:
            cost3 += 1

        candi.append(cost3)

    if candi:
        ans = min(candi)
    else:
        ans = -1
    
    ansl.append(ans)

print(*ansl, sep='\n')