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Polish the chapter of array and linkedlist
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@@ -7,8 +7,8 @@
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/* 双向链表节点 */
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class ListNode {
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var val: Int // 节点值
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var next: ListNode? // 后继节点引用(指针)
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weak var prev: ListNode? // 前驱节点引用(指针)
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var next: ListNode? // 后继节点引用
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weak var prev: ListNode? // 前驱节点引用
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init(val: Int) {
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self.val = val
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