Rearrange Matrix without Duplicates in Each Column

import java.util.*;
public class Hello {

    public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int r=sc.nextInt();
		int c=sc.nextInt();
		int[][]a=new int[r][c];
		int count[]=new int[999999];
		int k=0;
		for(int i=0;i<r;i++)
		{
		    for(int j=0;j<c;j++)
		    {
		        a[i][j]=sc.nextInt();
		        count[a[i][j]]++;
		    }
		}
		for(int i=0;i<count.length;i++)
		{
		    if(count[i]>c)
		    {
		        System.out.print("NO"); 
		        System.exit(0);
		    }
		    else
		    {
		        k++;
		    }
		}
		if(k==count.length)
		{
		    System.out.print("YES");
		}
	}
}