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<p>「层序遍历 Level-Order Traversal」从顶至底、一层一层地遍历二叉树,并在每层中按照从左到右的顺序访问结点。</p>
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<p>层序遍历本质上是「广度优先搜索 Breadth-First Traversal」,其体现着一种“一圈一圈向外”的层进遍历方式。</p>
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<p><img alt="二叉树的层序遍历" src="../binary_tree_traversal.assets/binary_tree_bfs.png" /></p>
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<p align="center"> Fig. 二叉树的层序遍历 </p>
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<h3 id="_1">算法实现<a class="headerlink" href="#_1" title="Permanent link">¶</a></h3>
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<p>广度优先遍历一般借助「队列」来实现。队列的规则是“先进先出”,广度优先遍历的规则是 ”一层层平推“ ,两者背后的思想是一致的。</p>
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<p>相对地,前、中、后序遍历皆属于「深度优先遍历 Depth-First Traversal」,其体现着一种“先走到尽头,再回头继续”的回溯遍历方式。</p>
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<p>如下图所示,左侧是深度优先遍历的的示意图,右上方是对应的递归实现代码。深度优先遍历就像是绕着整个二叉树的外围“走”一圈,走的过程中,在每个结点都会遇到三个位置,分别对应前序遍历、中序遍历、后序遍历。</p>
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<p><img alt="二叉搜索树的前、中、后序遍历" src="../binary_tree_traversal.assets/binary_tree_dfs.png" /></p>
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<p align="center"> Fig. 二叉树的前 / 中 / 后序遍历 </p>
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