<p>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 <strong>non-decreasing order</strong> by height. Let this ordering be represented by the integer array <code>expected</code> where <code>expected[i]</code> is the expected height of the <code>i<sup>th</sup></code> student in line.</p> <p>You are given an integer array <code>heights</code> representing the <strong>current order</strong> that the students are standing in. Each <code>heights[i]</code> is the height of the <code>i<sup>th</sup></code> student in line (<strong>0-indexed</strong>).</p> <p>Return <em>the <strong>number of indices</strong> where </em><code>heights[i] != expected[i]</code>.</p> <p> </p> <p><strong>Example 1:</strong></p> <pre> <strong>Input:</strong> heights = [1,1,4,2,1,3] <strong>Output:</strong> 3 <strong>Explanation:</strong> heights: [1,1,<u>4</u>,2,<u>1</u>,<u>3</u>] expected: [1,1,<u>1</u>,2,<u>3</u>,<u>4</u>] Indices 2, 4, and 5 do not match. </pre> <p><strong>Example 2:</strong></p> <pre> <strong>Input:</strong> heights = [5,1,2,3,4] <strong>Output:</strong> 5 <strong>Explanation:</strong> heights: [<u>5</u>,<u>1</u>,<u>2</u>,<u>3</u>,<u>4</u>] expected: [<u>1</u>,<u>2</u>,<u>3</u>,<u>4</u>,<u>5</u>] All indices do not match. </pre> <p><strong>Example 3:</strong></p> <pre> <strong>Input:</strong> heights = [1,2,3,4,5] <strong>Output:</strong> 0 <strong>Explanation:</strong> heights: [1,2,3,4,5] expected: [1,2,3,4,5] All indices match. </pre> <p> </p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= heights.length <= 100</code></li> <li><code>1 <= heights[i] <= 100</code></li> </ul>