From 713154644bc45e88e69271f35451d56212455de4 Mon Sep 17 00:00:00 2001
From: Sangeeth Sudheer <sangeeth96@users.noreply.github.com>
Date: Mon, 25 Apr 2022 11:30:32 +0530
Subject: [PATCH] maximum-depth-of-bt py3

---
 0104_maximum-depth-of-binary-tree/README.md   | 24 +++++++++++++++++
 .../python3/bfs.py                            |  0
 .../python3/dfs-pre-order-global.py           | 27 +++++++++++++++++++
 .../python3/dfs-pre-order-oneliner.py         | 17 ++++++++++++
 .../python3/solution.py                       |  0
 5 files changed, 68 insertions(+)
 create mode 100644 0104_maximum-depth-of-binary-tree/README.md
 create mode 100644 0104_maximum-depth-of-binary-tree/python3/bfs.py
 create mode 100644 0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-global.py
 create mode 100644 0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-oneliner.py
 create mode 100644 0104_maximum-depth-of-binary-tree/python3/solution.py

diff --git a/0104_maximum-depth-of-binary-tree/README.md b/0104_maximum-depth-of-binary-tree/README.md
new file mode 100644
index 0000000..1fa41ac
--- /dev/null
+++ b/0104_maximum-depth-of-binary-tree/README.md
@@ -0,0 +1,24 @@
+Given the `root` of a binary tree, return _its maximum depth_.
+
+A binary tree's **maximum depth** is the number of nodes along the longest path from the root node down to the farthest leaf node.
+
+**Example 1:**
+
+![](https://assets.leetcode.com/uploads/2020/11/26/tmp-tree.jpg)
+
+    Input: root = [3,9,20,null,null,15,7]
+    Output: 3
+    
+
+**Example 2:**
+
+    Input: root = [1,null,2]
+    Output: 2
+    
+
+**Constraints:**
+
+*   The number of nodes in the tree is in the range `[0, 104]`.
+*   `-100 <= Node.val <= 100`
+
+https://leetcode.com/problems/maximum-depth-of-binary-tree
\ No newline at end of file
diff --git a/0104_maximum-depth-of-binary-tree/python3/bfs.py b/0104_maximum-depth-of-binary-tree/python3/bfs.py
new file mode 100644
index 0000000..e69de29
diff --git a/0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-global.py b/0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-global.py
new file mode 100644
index 0000000..be31424
--- /dev/null
+++ b/0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-global.py
@@ -0,0 +1,27 @@
+# Time: O(N)
+# Space: O(N)
+
+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+class Solution:
+    maxDepthValue = 0
+    
+    def maxDepth(self, root: Optional[TreeNode]) -> int:
+        '''
+        Recursive DFS pre-order but storing max globally
+        '''
+        def findMax(node, depth):
+            if node is None: return None
+            
+            currDepth = depth + 1
+            self.maxDepthValue = max(currDepth, self.maxDepthValue)
+            findMax(node.left, currDepth)
+            findMax(node.right, currDepth)
+        
+        findMax(root, 0)
+        
+        return self.maxDepthValue
diff --git a/0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-oneliner.py b/0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-oneliner.py
new file mode 100644
index 0000000..81f9278
--- /dev/null
+++ b/0104_maximum-depth-of-binary-tree/python3/dfs-pre-order-oneliner.py
@@ -0,0 +1,17 @@
+# Time: O(N)
+# Space: O(N)
+
+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+class Solution:
+    maxDepthValue = 0
+    
+    def maxDepth(self, root: Optional[TreeNode]) -> int:
+        '''
+        Recursive DFS
+        '''
+        return 0 if root is None else 1 + max(self.maxDepth(root.left), self.maxDepth(root.right))
diff --git a/0104_maximum-depth-of-binary-tree/python3/solution.py b/0104_maximum-depth-of-binary-tree/python3/solution.py
new file mode 100644
index 0000000..e69de29