def solve():
    a,b,c = map(int,input().split())
    ans = 0
    if a < c:
        a,c = c,a
    elif a == c:
        if c > 1:
            c -= 1
            ans += 1
        else:
            print(-1)
            return
    if a < b:
        print(ans)
    elif a == b:
        if a - 1 > c:
            print(ans + 1)
        elif a - 1 == c:
            if c == 1:
                print(-1)
            else:
                print(ans + 2)
    else: # a > b:
        tmp = 10 ** 9
        if b < c:
            print(ans)
            return
        if b - c > 1:
            tmp = min(tmp,a - b + 1)
        if c > 1:
            tmp = min(tmp, b - c + 1)
        if tmp == 10 ** 9:
            print(-1)
        else:
            print(ans + tmp)

for _ in range(int(input())):
    solve()