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Polish the chapter of array and linkedlist
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@ -11,8 +11,8 @@ import java.util.*;
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/* 双向链表节点 */
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class ListNode {
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int val; // 节点值
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ListNode next; // 后继节点引用(指针)
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ListNode prev; // 前驱节点引用(指针)
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ListNode next; // 后继节点引用
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ListNode prev; // 前驱节点引用
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ListNode(int val) {
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this.val = val;
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