LeetCode - Algorithms - 701. Insert into a Binary Search Tree

Problem

701. Insert into a Binary Search Tree

Java

Recursion

© Robert Sedgewick and Kevin Wayne

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/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode() {}
 *     TreeNode(int val) { this.val = val; }
 *     TreeNode(int val, TreeNode left, TreeNode right) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
class Solution {
    public TreeNode insertIntoBST(TreeNode root, int val) {
        return recur(root, val);
    }
    
    private  TreeNode recur(TreeNode node, int val) {
        if (node == null) {
            return new TreeNode(val);
        }
        if (val < node.val) {
            node.left = recur(node.left, val);
        } else if (val > node.val) {
            node.right = recur(node.right, val);
        } else {
            node.val = val;
        }
        return node;
    }
}

Submission Detail

  • 35 / 35 test cases passed.
  • Runtime: 0 ms, faster than 100.00% of Java online submissions for Insert into a Binary Search Tree.
  • Memory Usage: 39.1 MB, less than 98.22% of Java online submissions for Insert into a Binary Search Tree.