Height Checker

1051. Height Checker

 

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 i^th 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 i^th 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

 

Solution to the above Question

class Solution {

public:

    int heightChecker(vector<int>& heights) {

        int count =0;

        vector<int>expected=heights;

        sort(expected.begin(),expected.end());

        for(int i=0; i<heights.size(); i++){

            if(heights[i]!=expected[i]){

                count++;

            }

        }

        return count;

    }

};