Leetcode 1051.高度检查

class Solution {
public:
    int heightChecker(vector<int>& heights) {
        vector<int> expected(heights);
        int t=expected.size(),ans=0;
        sort(expected.begin(),expected.end());
        for (int i=0;i<t;i++)
            if (expected[i]!=heights[i])
                ans+=1;
        return ans;
    }
};