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559. Maximum Depth of N-ary Tree 👍

  • Time: $O(n)$
  • Space: $O(h)$
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class Solution {
 public:
  int maxDepth(Node* root) {
    if (root == nullptr)
      return 0;

    int ans = 0;

    for (Node* child : root->children)
      ans = max(ans, maxDepth(child));

    return 1 + ans;
  }
};

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class Solution {
  public int maxDepth(Node root) {
    if (root == null)
      return 0;

    int ans = 0;

    for (Node child : root.children)
      ans = Math.max(ans, maxDepth(child));

    return 1 + ans;
  }
}

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class Solution:
  def maxDepth(self, root: 'Node') -> int:
    if not root:
      return 0
    if not root.children:
      return 1
    return 1 + max(self.maxDepth(child) for child in root.children)