Maximum Depth of Binary Tree Problem
Description
LeetCode Problem 104.
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:
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Input: root = [3,9,20,null,null,15,7]
Output: 3
Example 2:
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Input: root = [1,null,2]
Output: 2
Example 3:
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Input: root = []
Output: 0
Example 4:
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Input: root = [0]
Output: 1
Constraints:
- The number of nodes in the tree is in the range [0, 10^4].
- -100 <= Node.val <= 100
Sample C++ Code
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class Solution {
public:
int maxDepth(TreeNode* root) {
if (root == NULL)
return 0;
else if ((root->left == NULL) && (root->right == NULL))
return 1;
else if (root->left == NULL)
return maxDepth(root->right) + 1;
else if (root->right == NULL)
return maxDepth(root->left) + 1;
else
return max(maxDepth(root->left), maxDepth(root->right)) + 1;
}
};