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剑指 Offer 06. 从尾到头打印链表 #65

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@Geekhyt

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@Geekhyt

原题链接

递归

  1. “递” 阶段先走至链表末尾
  2. head === null 为递归终止条件
  3. “归” 阶段依次将每个节点上的值加入列表,即可实现链表值的倒序输出
constreversePrint=function(head){returnhead===null ?[] :reversePrint(head.next).concat(head.val)}
  • 时间复杂度: O(n)
  • 空间复杂度: O(n)

  1. 借助两个栈,先将链表中每个节点的值 push 进 stack1
  2. 然后再从 stack1 中 pop 出每个节点的值放入 stack2
constreversePrint=function(head){conststack1=[]conststack2=[]while(head){stack1.push(head.val)head=head.next}constk=stack1.length;for(leti=0;i<k;i++){stack2[i]=stack1.pop()}returnstack2}
  • 时间复杂度: O(n)
  • 空间复杂度: O(n)

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