114. Flatten Binary Tree to Linked List

2026-03-25 23:18:30 +03:00
parent a8727e17a1
commit 6b483ea6d1
5 changed files with 131 additions and 0 deletions
--- a/List/Solution.cs
+++ b/List/Solution.cs
@@ -0,0 +1,27 @@
+
+public class Solution
+{
+    public void Flatten(TreeNode? root)
+    {
+        if (root == null)
+            return;
+        var head = root;
+        var stack = new Stack<TreeNode>();
+        if (root.right != null)
+            stack.Push(root.right);
+        if (root.left != null)
+            stack.Push(root.left);
+        while (stack.Count > 0)
+        {
+            var node = stack.Pop();
+            head.left = null;
+            head.right = node;
+            head = node;
+            if (node.right != null)
+                stack.Push(node.right);
+            if (node.left != null)
+                stack.Push(node.left);
+
+        }
+    }
+}