def solve(a,b,c):
    if a==c==1:
        return -1
    if a==c:
        return 1+solve(a,b,c-1)
    if a>c:
        return solve(c,b,a)
    assert 1<=a<c
    if c<b or b<a:
        return 0
    if a==1:
        return -1
    if b==1 or b==2:
        return b-(a-1)
    return min(b-(a-1),c-(b-1)+min(a,b-2)-a)
for _ in range(int(input())):
 a,b,c=map(int,input().split())
 print(solve(a,b,c))