diff --git a/LeetCode-CN/104.cpp b/LeetCode-CN/104.cpp
new file mode 100644
index 0000000..08a0d0c
--- /dev/null
+++ b/LeetCode-CN/104.cpp
@@ -0,0 +1,24 @@
+class Solution {
+public:
+	int maxDepth(TreeNode* root) {
+		if (!root) return 0;
+		std::queue<std::pair<TreeNode*, int>> bus;
+		bus.push(std::make_pair(root, 1));
+		int hmax = 1;
+		while (!bus.empty())
+		{
+			std::pair<TreeNode*,int> now = bus.front();
+			hmax = std::max(hmax, now.second);
+			bus.pop();
+			if (now.first->left)
+			{
+				bus.push(std::make_pair(now.first->left, now.second + 1));
+			}
+			if (now.first->right)
+			{
+				bus.push(std::make_pair(now.first->right, now.second + 1));
+			}
+		}
+		return hmax;
+	}
+};