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39 lines
2.0 KiB
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<p>Given the <code>root</code> of a binary tree and two integers <code>val</code> and <code>depth</code>, add a row of nodes with value <code>val</code> at the given depth <code>depth</code>.</p>
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<p>Note that the <code>root</code> node is at depth <code>1</code>.</p>
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<p>The adding rule is:</p>
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<ul>
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<li>Given the integer <code>depth</code>, for each not null tree node <code>cur</code> at the depth <code>depth - 1</code>, create two tree nodes with value <code>val</code> as <code>cur</code>'s left subtree root and right subtree root.</li>
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<li><code>cur</code>'s original left subtree should be the left subtree of the new left subtree root.</li>
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<li><code>cur</code>'s original right subtree should be the right subtree of the new right subtree root.</li>
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<li>If <code>depth == 1</code> that means there is no depth <code>depth - 1</code> at all, then create a tree node with value <code>val</code> as the new root of the whole original tree, and the original tree is the new root's left subtree.</li>
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</ul>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/03/15/addrow-tree.jpg" style="width: 500px; height: 231px;" />
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<pre>
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<strong>Input:</strong> root = [4,2,6,3,1,5], val = 1, depth = 2
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<strong>Output:</strong> [4,1,1,2,null,null,6,3,1,5]
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</pre>
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<p><strong>Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/03/11/add2-tree.jpg" style="width: 500px; height: 277px;" />
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<pre>
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<strong>Input:</strong> root = [4,2,null,3,1], val = 1, depth = 3
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<strong>Output:</strong> [4,2,null,1,1,3,null,null,1]
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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 is in the range <code>[1, 10<sup>4</sup>]</code>.</li>
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<li>The depth of the tree is in the range <code>[1, 10<sup>4</sup>]</code>.</li>
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<li><code>-100 <= Node.val <= 100</code></li>
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<li><code>-10<sup>5</sup> <= val <= 10<sup>5</sup></code></li>
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<li><code>1 <= depth <= the depth of tree + 1</code></li>
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</ul>
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