Create height-checker.cpp

Author: kamyu104

C++/height-checker.cpp

@@ -0,0 +1,15 @@
+// Time:  O(nlogn)
+// Space: O(n)
+
+class Solution {
+public:
+    int heightChecker(vector<int>& heights) {
+        vector<int> sorted_heights{heights};
+        sort(sorted_heights.begin(), sorted_heights.end());
+        int result = 0;
+        for (int i = 0; i < heights.size(); ++i) {
+            result += static_cast<int>(heights[i] != sorted_heights[i]);
+        }
+        return result;
+    }
+};