Compute number of distinct values in an array.

Distinct.java

import java.util.Arrays;

public class Distinct {
	public int distinctElements(int[] A) {
		if(A == null || A.length == 0) {
			return 0;
		}
		
		Arrays.sort(A);
		
		int counter = 1;
		for(int i = 1; i < A.length; i++) {
			if(A[i] != A[i - 1]) {
				counter++;
			}
		}
		
		return counter;
	}
}