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存量题库数据更新
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<p>A leaf of a node is a node that has no children.</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/2019/01/30/tree1.png" style="width: 534px; height: 358px;" />
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<pre>
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<strong>Input:</strong> root = [0,1,2,3,4,3,4]
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<strong>Output:</strong> "dba"
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</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/2019/01/30/tree2.png" style="width: 534px; height: 358px;" />
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<pre>
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<strong>Input:</strong> root = [25,1,3,1,3,0,2]
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<strong>Output:</strong> "adz"
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</pre>
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<p><strong>Example 3:</strong></p>
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<p><strong class="example">Example 3:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2019/02/01/tree3.png" style="height: 490px; width: 468px;" />
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<pre>
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<strong>Input:</strong> root = [2,2,1,null,1,0,null,0]
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