Height Checker.cpp

/* 
    Solution by Rahul Surana
    
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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].


    ***********************************************************
*/


class Solution {
public:
    int heightChecker(vector<int>& heights) {
        vector<int> idx = heights;
        int ans = 0;
        sort(idx.begin(),idx.end());
        for(int i = 0; i < idx.size(); i++) if(idx[i] != heights[i]) ans++;
        return ans;
    }
};