Create beautiful-arrangement-ii.cpp

Author: kamyu104

C++/beautiful-arrangement-ii.cpp

@@ -0,0 +1,19 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    vector<int> constructArray(int n, int k) {
+        vector<int> result;
+        int left = 1, right = n;
+        while (left <= right) {
+            if (k > 1) {
+                result.emplace_back(k-- % 2 ? left++ : right--);
+            }
+            else {
+                result.emplace_back(k % 2 ? left++ : right--);
+            }
+        }
+        return result;
+    }
+};