#include<bits/stdc++.h>
#define REP(i,n) for(int i=0,i##_len=int(n);i<i##_len;++i)
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
#define All(x) (x).begin(),(x).end()
#define rAll(x) (x).rbegin(),(x).rend()
using namespace std;
using ll = long long;

int main(){
    int T;cin>>T;
    REP(q,T){
        int A,B,C;
        cin>>A>>B>>C;
        if(A>C) swap(A,C);
        if((C-B)*(B-A)<0) cout<<0<<endl;
        else if(A==1){
            if(B<=2) cout<<-1<<endl;
            else if(C==1) cout<<-1<<endl;
            else cout<<max(C-B+1,0)<<endl;
        }
        else if(B==1){
            if(A+C<=4) cout<<-1<<endl;
            else if(A==C) cout<<1<<endl;
            else cout<<0<<endl;
        }
        else if(A==B){
            if(A==C){
                if(A==2) cout<<-1<<endl;
                else cout<<3<<endl;
            }
            else{
                cout<<1<<endl;
            }
        }
        else if(B==C){
            if(A+1==C) cout<<2<<endl;
            else cout<<1<<endl;
        }
        else if(A+1==B){
            cout<<2<<endl;
        }
        else cout<<min(B-A+1,C-B+1)<<endl;
    }
}