/**
 *    author:  pollob18
 *    created: July 2024
**/
#include<bits/stdc++.h>
#define ll    long long int
#define yes   "YES"
#define no    "NO"
#define nl    "\n"
using namespace std;

void solution()
{
    int a,b,c;
    cin>>a>>b>>c;
    int mx=max({a,b,c});
    int mn=min({a,b,c});
    int x=mx-mn;
    cout<<x/2<<nl;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int tc;
    cin>>tc;
    while(tc--)
    {
        solution();
    }
    return 0;

}