/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	static void separate4Colors(int[] a) {
		int[] index = new int[4];
		for(int n : a) {
    		int r = n % 4;
    		if (r != 3) {
        		index[r+1]++;
    		}
		}
		index[2] += index[1];
		index[3] += index[2];
		int[] res = new int[a.length];
		for(int n : a) {
    		res[index[n%4]++] = n;
		}
		System.arraycopy(res, 0, a, 0, a.length);
	}
	public static void main (String[] args) throws java.lang.Exception
	{
		int[] a = new int[]{0,2,4,5,6,8,7,9,10,12,14,15,17,20,1};
		System.out.println(Arrays.toString(a));
		separate4Colors(a);
		System.out.println(Arrays.toString(a));
	}
}

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