height-checker.cpp

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