diff --git a/104_maximum_depth_of_binary_tree/main.cpp b/104_maximum_depth_of_binary_tree/main.cpp
new file mode 100644
index 0000000..2320bce
--- /dev/null
+++ b/104_maximum_depth_of_binary_tree/main.cpp
@@ -0,0 +1,35 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+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 maxDepth(TreeNode *root) {
+        unordered_map<TreeNode *, bool> visited;
+        int maxDepth = 0;
+
+        function<void(TreeNode *, int)> dfs = [&](TreeNode *root, int currentDepth) {
+            if (!root) return;
+
+            if (visited[root]) return;
+            visited[root] = true;
+
+            maxDepth = max(maxDepth, currentDepth);
+
+            dfs(root->left, currentDepth + 1);
+            dfs(root->right, currentDepth + 1);
+        };
+
+        dfs(root, 1);
+
+        return maxDepth;
+    }
+};
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