Package g0901_1000.s0919_complete_binary_tree_inserter

Class CBTInserter

java.lang.Object

g0901_1000.s0919_complete_binary_tree_inserter.CBTInserter

public class CBTInserter
extends Object

919 - Complete Binary Tree Inserter.<p>Medium</p> <p>A <strong>complete binary tree</strong> is a binary tree in which every level, except possibly the last, is completely filled, and all nodes are as far left as possible.</p> <p>Design an algorithm to insert a new node to a complete binary tree keeping it complete after the insertion.</p> <p>Implement the <code>CBTInserter</code> class:</p> <ul> <li><code>CBTInserter(TreeNode root)</code> Initializes the data structure with the <code>root</code> of the complete binary tree.</li> <li><code>int insert(int v)</code> Inserts a <code>TreeNode</code> into the tree with value <code>Node.val == val</code> so that the tree remains complete, and returns the value of the parent of the inserted <code>TreeNode</code>.</li> <li><code>TreeNode get_root()</code> Returns the root node of the tree.</li> </ul> <p><strong>Example 1:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2021/08/03/lc-treeinsert.jpg" alt="" /></p> <p><strong>Input</strong> [&ldquo;CBTInserter&rdquo;, &ldquo;insert&rdquo;, &ldquo;insert&rdquo;, &ldquo;get_root&rdquo;] [<a href="1,-2">1, 2</a>, [3], [4], []]</p> <p><strong>Output:</strong> [null, 1, 2, [1, 2, 3, 4]]</p> <p><strong>Explanation:</strong></p> <pre><code> CBTInserter cBTInserter = new CBTInserter([1, 2]); cBTInserter.insert(3); // return 1 cBTInserter.insert(4); // return 2 cBTInserter.get\_root(); // return [1, 2, 3, 4] </code></pre> <p><strong>Constraints:</strong></p> <ul> <li>The number of nodes in the tree will be in the range <code>[1, 1000]</code>.</li> <li><code>0 <= Node.val <= 5000</code></li> <li><code>root</code> is a complete binary tree.</li> <li><code>0 <= val <= 5000</code></li> <li>At most <code>10⁴</code> calls will be made to <code>insert</code> and <code>get_root</code>.</li> </ul>

Constructor Summary

Constructors

Constructor	Description
CBTInserter(TreeNode root)

Method Summary

Modifier and Type	Method	Description
TreeNode	getRoot()
int	insert(int val)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CBTInserter

public CBTInserter(TreeNode root)

Method Details

insert

public int insert(int val)

getRoot

public TreeNode getRoot()