1 files changed, 57 insertions, 0 deletions
diff --git a/235/main.py b/235/main.py
new file mode 100755
index 0000000..29b186d
--- /dev/null
+++ b/235/main.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+
+# Definition for a binary tree node.
+class TreeNode:
+    def __init__(self, x):
+        self.val = x
+        self.left = None
+        self.right = None
+
+
+class Solution:
+    def lowestCommonAncestor(
+        self, root: "TreeNode", p: "TreeNode", q: "TreeNode"
+    ) -> "TreeNode":
+        if root is None:
+            return None
+
+        cur = root
+
+        while cur:
+            if cur.val > p.val and cur.val > q.val:
+                cur = cur.left
+            elif cur.val < p.val and cur.val < q.val:
+                cur = cur.right
+            else:
+                return cur
+
+
+def main():
+    node11 = TreeNode(6)
+    node12 = TreeNode(2)
+    node13 = TreeNode(8)
+    node14 = TreeNode(0)
+    node15 = TreeNode(4)
+    node16 = TreeNode(7)
+    node17 = TreeNode(9)
+    node18 = TreeNode(3)
+    node19 = TreeNode(5)
+
+    node11.left = node12
+    node11.right = node13
+    node12.left = node14
+    node12.right = node15
+    node13.left = node16
+    node13.right = node17
+    node15.left = node18
+    node15.right = node19
+
+    solution = Solution()
+    print(solution.lowestCommonAncestor(node11, node12, node15).val)
+    print(solution.lowestCommonAncestor(node11, node17, node19).val)
+    print(solution.lowestCommonAncestor(node11, node19, node17).val)
+    print(solution.lowestCommonAncestor(node11, node19, node14).val)
+
+
+if __name__ == "__main__":
+    main()