A school is trying to take an annual photo of all the students. The students are asked to stand in a single file line in non-decreasing order by height. Let this ordering be represented by the integer array `expected` where `expected[i]` is the expected height of the `ith` student in line.

You are given an integer array `heights` representing the current order that the students are standing in. Each `heights[i]` is the height of the `ith` student in line (0-indexed).

Return the number of indices where `heights[i] != expected[i]`.

Example 1:

    Input: heights = [1,1,4,2,1,3]
    Output: 3
    Explanation:
    heights:  [1,1,4,2,1,3]
    expected: [1,1,1,2,3,4]
    Indices 2, 4, and 5 do not match.

Example 2:

    Input: heights = [5,1,2,3,4]
    Output: 5
    Explanation:
    heights:  [5,1,2,3,4]
    expected: [1,2,3,4,5]
    All indices do not match.

Example 3:

    Input: heights = [1,2,3,4,5]
    Output: 0
    Explanation:
    heights:  [1,2,3,4,5]
    expected: [1,2,3,4,5]
    All indices match.

Constraints:

- `1 <= heights.length <= 100`
- `1 <= heights[i] <= 100`