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40 lines
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40 lines
1.8 KiB
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<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>
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<p>Design an algorithm to insert a new node to a complete binary tree keeping it complete after the insertion.</p>
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<p>Implement the <code>CBTInserter</code> class:</p>
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<ul>
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<li><code>CBTInserter(TreeNode root)</code> Initializes the data structure with the <code>root</code> of the complete binary tree.</li>
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<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>
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<li><code>TreeNode get_root()</code> Returns the root node of the tree.</li>
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</ul>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/08/03/lc-treeinsert.jpg" style="width: 500px; height: 143px;" />
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<pre>
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<strong>Input</strong>
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["CBTInserter", "insert", "insert", "get_root"]
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[[[1, 2]], [3], [4], []]
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<strong>Output</strong>
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[null, 1, 2, [1, 2, 3, 4]]
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<strong>Explanation</strong>
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CBTInserter cBTInserter = new CBTInserter([1, 2]);
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cBTInserter.insert(3); // return 1
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cBTInserter.insert(4); // return 2
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cBTInserter.get_root(); // return [1, 2, 3, 4]
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li>The number of nodes in the tree will be in the range <code>[1, 1000]</code>.</li>
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<li><code>0 <= Node.val <= 5000</code></li>
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<li><code>root</code> is a complete binary tree.</li>
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<li><code>0 <= val <= 5000</code></li>
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<li>At most <code>10<sup>4</sup></code> calls will be made to <code>insert</code> and <code>get_root</code>.</li>
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</ul>
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