#include<iostream>
using namespace std;
int main()
{
    int T,a[100],b[100],c[100],i;
    cin>>T;
    cout<<endl;

    //to get the input:
    for(i=0;i<T;i++)
        {cin>>a[i]>>b[i]>>c[i];
        cout<<endl;
        }
    //core code of the problem:
    for(i=0;i<T;i++)
        {
            while(c[i])
                {if(a[i]>b[i])
                    {b[i]++;
                    c[i]--;
                    }
                else if(b[i]>a[i])
                    {a[i]++;
                    c[i]--;
                    }
                else if(a[i]==b[i])
                    break;
                }
        if(a[i]>b[i])
         cout<<a[i]-b[i]<<endl;
        else
         cout<<b[i]-a[i]<<endl;
        }
    return 0;
    }