---
# System prepended metadata

title: 104. Maximum Depth of Binary Tree
tags: [C++, LeetCode-Easy]

---

# 104. Maximum Depth of Binary Tree
Difficulty: Easy

## Solution

```cpp=
/**
*** Author: R-CO
*** E-mail: daniel1820kobe@gmail.com
*** Date: 2020-10-15
**/
#include <algorithm>
#include <cstdlib>

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) {
    int depth = 0;
    depth = findMaxDepth(root, depth);

    return depth;
  }

 private:
  int findMaxDepth(TreeNode *node, int depth) {
    if (node == nullptr) {
      return depth;
    }

    ++depth;
    return std::max(findMaxDepth(node->left, depth),
                    findMaxDepth(node->right, depth));
  }
};

int main(int argc, char *argv[]) { return EXIT_SUCCESS; }

```

## Result

Success
Details 
Runtime: 8 ms, faster than 94.69% of C++ online submissions for Maximum Depth of Binary Tree.
Memory Usage: 19.5 MB, less than 9.04% of C++ online submissions for Maximum Depth of Binary Tree.

###### tags: `LeetCode-Easy` `C++`
