1051. Height Checker.cpp

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