#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000009



int main(){
	
	int T;
	cin>>T;
	
	for(int i=0;i<T;i++){
		int A,B,C;
		cin>>A>>B>>C;
		if(A>B&&C>B){
			if(A==C){
				if(B+1==A){
					if(B==1)cout<<-1<<endl;
					else cout<<2<<endl;
				}
				else{
					cout<<1<<endl;
				}
				
			}
			else{
				cout<<0<<endl;
			}
			continue;
		}
		if(A<B&&C<B){
			if(A==C){
				if(A==1)cout<<-1<<endl;
				else cout<<1<<endl;
			}
			else{
				cout<<0<<endl;
			}
			continue;
		}
		if(A>C)swap(A,C);
		
		int ans = 0;
		int x = 0;
		if(A==B){
			ans++;
			x++;
			if(A==C){
				ans+=2;
				x++;
			}
			if(B-x<=0)ans = -1;
		}
		else if(B==C){
			ans++;
			x++;
			if(C-1==A){
				ans++;
				x++;
			}
			if(C-x<=0)ans = -1;
		}
		else{
			ans = Inf;
			if(A!=1)ans = min(ans,B-A+1);
			if(B-A!=1)ans = min(ans,C-B+1);
			if(ans==Inf)ans = -1;
		}
		cout<<ans<<endl;
	}

	return 0;
}