Help me in solving FRUITS problem

help
,
1

My issue

i have used a simple approach, i just reduced the apple or oranges till my money(k) got exhausted, i am failing on a hidden test case

My code

#include <bits/stdc++.h>
using namespace std;

int main() {
	// your code goes here
    int t; cin>>t;
    while(t--){
        int a,o,k;
        cin>>a>>o>>k;
        while(k--){
            if(a>o)  a--;
            else o--;
        }
        cout<<abs(a-o)<<endl;
    }
}

Problem Link: Chef and Fruits Practice Coding Problem