1051. Height checker

//1051. Height checker

class Solution {
    public int heightChecker(int[] heights) {
        int[] expected = new int[heights.length];
        int count = 0;

        for(int i = 0; i < heights.length; i++) {
            expected[i] = heights[i];
        }

        Arrays.sort(expected);

        for(int i = 0; i < heights.length; i++) {
            if(heights[i] != expected[i]) {
                count++;
            }
        }

        return count;
    }
}