二叉树的先序,中序,后序遍历

二叉树的遍历方法主要有先序遍历、中序遍历和后序遍历。先序遍历是指先访问根节点，然后按照先序遍历的方式递归遍历左子树和右子树。中序遍历是指先递归遍历左子树，然后访问根节点，最后递归遍历右子树。后序遍历是指先递归遍历左子树和右子树，最后访问根节点。这三种遍历方法可以使用递归和非递归的方式实现。举例来说，假设有一个二叉树，其根节点为A，左子树为B，右子树为C。先序遍历的结果是A -> B -> C，中序遍历的结果是B -> A -> C，后序遍历的结果是B -> C -> A。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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