C++ :

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

int main(){
	int n,i,j,x,c;
	string s[1000];
	string t;
	cin>>n;
	for (i = 0;i < n;i++){
		cin>>x;
		while (x != 0){
			c = x % 10;
			x = x / 10;
			s[i] = (char)(c + 48) + s[i];
		}
	}
	for (i = 1;i < n;i++){
		for (j = 0;j < n - i;j++){
			if (s[j] < s[j + 1]){
				t = s[j];
				s[j] = s[j + 1];
				s[j + 1] = t;
			}
		}
	}
	for (i = 0;i < n;i++){
		cout<<s[i];
	}
}

Java :

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n];
		int t;
		for(int i=0;i<a.length;i++){
			a[i] = sc.nextInt();
		}
		for(int i=1;i<=n-1;i++){
			for(int j=0;j<n-i;j++){
				int x = Integer.parseInt(a[j]+""+a[j+1]);
				int y = Integer.parseInt(a[j+1]+""+a[j]);
				if(x < y){
					t = a[j];
					a[j] = a[j+1];
					a[j+1] = t;
				}
			}
		}
		for(int i=0;i<a.length;i++){
			System.out.print(a[i]);
		}
	}
	
	
}

Python :

input()
li = input().split()
li.sort(reverse=True)
for i in li:
   print(i,end='')