#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int t;
    cin >> t;
    while(t--){
        long long a, b, c;
        cin >> a >> b >> c;
        long long max_value = max(a, max(b,c));
        long long min_value = min(a, min(b,c));
        long long K =  int((max_value-min_value)/2);
        cout << K << endl;
    }
}