Help needed in Prefixing(FIX) of Starters 111

help
1

Can anyone point out the flaw here? The logic I’m applying is correct imo(guessing by seeing correct submitted solutions of other users)
Solution: 1033661824 - CodeChef

2

@s4ga
your logic is not fully correct
plzz refer my c++ code for better understanding

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

int main() {
	// your code goes here
	int t;
	cin>>t;
	while(t--)
	{
	    int n;
	    cin>>n;
	    int a[n];
	    int mx=0;
	    set<int> s;
	    for(int i=0;i<n;i++)
	    {
	        cin>>a[i];
	        mx=max(a[i],mx);
	    }
	    for(int i=0;i<n;i++)
	    {
	        if(!s.count(a[i]))
	        {
	            s.insert(a[i]);
	            cout<<a[i];
	        }
	        else
	        cout<<mx;
	        cout<<" ";
	    }
	    cout<<endl;
	}
	return 0;
}
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