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#1051 - Height Checker
Problem Description
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].
Solution
/**
* @param {number[]} heights
* @return {number}
*/
var heightChecker = function(heights) {
return [...heights]
.sort((a, b) => a - b)
.filter((expected, i) => heights[i] !== expected).length;
};