# coding: utf-8
# Your code here!
N=int(input())

for _ in range(N):
    A,B,C=map(int,input().split())
    
    ans=0
    if (B>A and B>C) or (B<A and B<C):
        if A==C:
            if A==1:
                print(-1)
                exit()
            else:
                ans+=1
        print(ans)
    else:
        if B<3 or (A==1 and C==1):
            print(-1)
        else:
            mx=B-1
            mi=min(A,C)-1
            print(min(max(A,C)-mx,B-mi))