T = int(input())
ans_list = []
for i in range(T):
    ans = 0
    A, B, C = list(map(int, input().split()))
    if A == C:
        if A == 1:
            ans_list.append(-1)
            continue
        else:
            ans += 1
            A -= 1
    if A <= B <= C:
        ba = B - A + 1
        cb = C - B + 1
        if C - cb == A:
            cb += 1
        if B <= ba and C <= cb:
            ans_list.append(-1)
        elif B <= ba:
            ans_list.append(ans + cb)
        elif C <= cb:
            ans_list.append(ans + ba)
        else:
            ans_list.append(ans + min([ba, cb]))
    elif C <= B <= A:
        bc = B - C + 1
        ab = A - B + 1
        if A - ab == C:
            ab += 1
        if B <= bc and A <= ab:
            ans_list.append(-1)
        elif B <= bc:
            ans_list.append(ans + ab)
        elif A <= ab:
            ans_list.append(ans + bc)
        else:
            ans_list.append(ans + min([bc, ab]))
    else:
        ans_list.append(ans)

for i in ans_list:
    print(i)