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[Leetcode] Remove Nth Node From End of List
Given a linked list, remove the nth node from the end of list and return its head.
For example,
Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from the end, the linked list becomes 1->2->3->5.
Note:
Given n will always be valid.
Try to do this in one pass.
Solution:
快慢指针。快的比慢的快n个位置,这样快的指针指到末尾的时候,慢的指针刚好距离list末尾n个位置。
1 /** 2 * Definition for singly-linked list. 3 * public class ListNode { 4 * int val; 5 * ListNode next; 6 * ListNode(int x) { 7 * val = x; 8 * next = null; 9 * }10 * }11 */12 public class Solution {13 public ListNode removeNthFromEnd(ListNode head, int n) {14 ListNode dummy=new ListNode(0);15 dummy.next=head;16 17 ListNode fast=dummy, slow=dummy;18 while(fast!=null&&n>0){19 fast=fast.next;20 n--;21 }22 while(fast.next!=null){23 fast=fast.next;24 slow=slow.next;25 }26 slow.next=slow.next.next;27 return dummy.next;28 }29 }
第一次提交的时候报错,问题在:
slow.next=slow.next.next;
我写成了
slow.next=fast;
当时由于自己只在草稿纸上画了下n=2的例子,而忘记了n的含义:nth node from the end of list.
[Leetcode] Remove Nth Node From End of List
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