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701. Insert into a Binary Search Tree 👍

  • Time: $O(\log n) \to O(n)$
  • Space: $O(\log n) \to O(n)$
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class Solution {
 public:
  TreeNode* insertIntoBST(TreeNode* root, int val) {
    if (root == nullptr)
      return new TreeNode(val);
    if (root->val > val)
      root->left = insertIntoBST(root->left, val);
    else
      root->right = insertIntoBST(root->right, val);
    return root;
  }
};

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class Solution {
  public TreeNode insertIntoBST(TreeNode root, int val) {
    if (root == null)
      return new TreeNode(val);
    if (root.val > val)
      root.left = insertIntoBST(root.left, val);
    else
      root.right = insertIntoBST(root.right, val);
    return root;
  }
}

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class Solution:
  def insertIntoBST(self, root: TreeNode | None, val: int) -> TreeNode | None:
    if not root:
      return TreeNode(val)
    if root.val > val:
      root.left = self.insertIntoBST(root.left, val)
    else:
      root.right = self.insertIntoBST(root.right, val)
    return root
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