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哑节点 #84

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lovelmh13 opened this issue Jun 22, 2021 · 0 comments

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lovelmh13 commented Jun 22, 2021

从链表头部开始处理的时候，添加一个哑节点，哑节点.next 指向真正的链表头。为了避免链表初始化的时候没有可用节点，而且链表构造过程需要指针移动，进而会导致头指针的丢失，无法返回结果。

这个哑节点的值是多少，无所谓。

例题： leetcode 2. 两数相加

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