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29 lines
860 B
HTML
29 lines
860 B
HTML
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<p>Given a binary tree, find its minimum depth.</p>
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<p>The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.</p>
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<p><strong>Note:</strong> A leaf is a node with no children.</p>
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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/2020/10/12/ex_depth.jpg" style="width: 432px; height: 302px;" />
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<pre>
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<strong>Input:</strong> root = [3,9,20,null,null,15,7]
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<strong>Output:</strong> 2
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> root = [2,null,3,null,4,null,5,null,6]
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<strong>Output:</strong> 5
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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>[0, 10<sup>5</sup>]</code>.</li>
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<li><code>-1000 <= Node.val <= 1000</code></li>
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</ul>
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