1051. Height Checker

Easy

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

class Solution:
    def heightChecker(self, heights: List[int]) -> int:
        sheights = sorted(heights)
        res = 0

        for i in range(len(heights)):
            if heights[i] != sheights[i]:
                res += 1

        return res