PermCheck - Check whether array A is a permutation (Codility Test)

Solution.java

import java.util.Arrays;

/**
 * Created by mateus marquezini on 27-04-2016.
 */
public class Solution {
    public int solution(int[] A) {

	Arrays.sort(A);

	if (A[0] != 1) {
	    return 0;
	}

	for (int i = 0; i < A.length - 1; i++) {
	    if (A[i] + 1 != A[i + 1]) {
		return 0;
	    }
	}
	return 1;
    }
}