1 files changed, 20 insertions, 0 deletions

diff --git a/top-interview-questions/easy/trees/01_maximum_depth_of_binary_tree.cc b/top-interview-questions/easy/trees/01_maximum_depth_of_binary_tree.cc
new file mode 100644
index 0000000..4d13af7
--- /dev/null
+++ b/top-interview-questions/easy/trees/01_maximum_depth_of_binary_tree.cc
@@ -0,0 +1,20 @@
+/**
+ * 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:
+    int max(int a, int b) { return a > b ? a : b; }
+
+    int maxDepth(TreeNode* root) {
+        if (!root) return 0;
+        return 1 + max(maxDepth(root->left), maxDepth(root->right));
+    }
+};