Q4Sort012Array

package com.java.rohit;

/******************************************************************************


https://practice.geeksforgeeks.org/problems/sort-an-array-of-0s-1s-and-2s/0
*******************************************************************************/
import java.util.*;
public class Q4Sort012Array
{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int arr[]=new int[n];
for(int i=0;i<n;i++) {
	arr[i]=sc.nextInt();
}
int low=0,mid=0,high=0;
int i;
for(i=0;i<n;i++) {
	if(arr[i]==0)
		low++;
	else if(arr[i]==1)
		mid++;
	else
		high++;
}
i=0;
while (low > 0) {
    arr[i++] = 0;
    low--;
}

while (mid > 0) {
    arr[i++] = 1;
    mid--;
}

while (high > 0) {
    arr[i++] = 2;
    high--;
}
for(int j=0;j<n;j++)
System.out.print(arr[j]);

}
}