Largest number from given array

#1

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

int mycompare(string X, string Y)
{
// first append Y at the end of X
string XY = X.append(Y);

// then append X at the end of Y 
string YX = Y.append(X); 

// Now see which of the two formed numbers is greater 
return XY.compare(YX) > 0 ? 1: 0;

}

int main() {

int t;
cin>>t;

while(t>0)
{
	int n;
	cin>>n;

	int arr[n];

	for(int i=0;i<n;i++)
	{
		cin>>arr[n];
	}

	sort(arr[0],arr[n-1],mycompare);

	for(int i=0;i<n;i++)
	{
		cout<<arr[i];
	}
}
return 0;

}

Please let me know the mistake

#2

Hey @arsh_goyal you were committing basic syntax errors ,here is your corrected code


If your doubt is resolved ,please mark it as resolved

#3

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