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存量题库数据更新
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<p>A node <code>a</code> is an ancestor of <code>b</code> if either: any child of <code>a</code> is equal to <code>b</code> or any child of <code>a</code> is an ancestor of <code>b</code>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></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/2020/11/09/tmp-tree.jpg" style="width: 400px; height: 390px;" />
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<pre>
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<strong>Input:</strong> root = [8,3,10,1,6,null,14,null,null,4,7,13]
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@@ -15,7 +15,7 @@
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|10 - 13| = 3
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Among all possible differences, the maximum value of 7 is obtained by |8 - 1| = 7.</pre>
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<p><strong>Example 2:</strong></p>
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<p><strong class="example">Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2020/11/09/tmp-tree-1.jpg" style="width: 250px; height: 349px;" />
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<pre>
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<strong>Input:</strong> root = [1,null,2,null,0,3]
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