Create main.cpp

Author: JawadSher

17 - Binary Tree Data Structure Problems/35 - Flatten Binary Tree to Linked List/main.cpp

@@ -0,0 +1,32 @@
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+ * };
+ */
+class Solution {
+public:
+    void flatten(TreeNode* root) {
+        TreeNode* current = root;
+
+        while(current != NULL){
+            if(current -> left){
+                TreeNode* pred = current -> left;
+
+                while(pred -> right){
+                    pred = pred -> right;
+                }
+                pred -> right = current -> right;
+                current -> right = current -> left;
+            }
+            
+            current -> left = NULL;
+            current = current -> right;
+        }
+    }
+};