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[Easy - wk4 - Q3] 104. Maximum Depth of Binary Tree

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작성일 2022.05.23 00:53

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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:

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

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익명
작성일 2022.05.24 09:01

C++
Runtime: 12 ms, faster than 55.34% of C++ online submissions for Maximum Depth of Binary Tree.
Memory Usage: 18.9 MB, less than 14.43% of C++ online submissions for Maximum Depth of Binary Tree.

class Solution {
public:
    int maxDepth(TreeNode* root) {
        if (!root) return 0;
        return max(maxDepth(root->left), maxDepth(root->right)) + 1;
    }
};

익명
작성일 2022.06.01 20:43

JS
Runtime: 76 ms, faster than 78.73% of JavaScript online submissions for Maximum Depth of Binary Tree.
Memory Usage: 45 MB, less than 63.27% of JavaScript online submissions for Maximum Depth of Binary Tree.

var maxDepth = function(root) {
    let counter = 0
    let BFS = (root, level) => {
        if (!root) return;
        if (counter < level) {
            counter = level;
        }
        BFS(root.left, level+1);
        BFS(root.right,level+1);
    } 
    BFS(root, 1);
    return counter;
}

익명
작성일 2022.06.01 21:29

Java

class Solution {
  public int maxDepth(TreeNode root) {
    if (root == null) {
      return 0;
    } else {
      int left_height = maxDepth(root.left);
      int right_height = maxDepth(root.right);
      return java.lang.Math.max(left_height, right_height) + 1;
    }
  }
}