import sys
input = sys.stdin.readline
def main():
    T = int(input())
    for _ in range(T):
        ans = 0
    
        A, B, C = map(int, input().split())
        if A == C == 1:
            print(-1)
            continue

        if B <= 2:
            max_cost = float('inf')
        else:
            max_cost = 0
            a = int(A)
            b = int(B)
            c = int(C)
            if a >= b:
                max_cost += a - (b - 1)
                a = b - 1
            if c >= b:
                max_cost += c - (b - 1)
                c = b - 1
            if a == c:
                max_cost += 1

        if A == 1 or C == 1 or A == C == 2:
            min_cost = float('inf')
        else:
            a = int(A)
            b = int(B)
            c = int(C)
            min_cost = 0
            if a == c:
                min_cost += 1
                c -= 1
            min_cost += max(b - (min(a,c) - 1),0)

        ans = min(max_cost, min_cost)
        if ans == float('inf'):
            print(-1)
        else:
            print(ans)

        


if __name__ == "__main__":
    main()