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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.
第三遍：
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 header = new ListNode(-1);15 header.next = head;16 ListNode fast = header, cur = header, lazy = header;17 for(int i = 0; i < n; i ++)18 fast = fast.next;19 20 while(fast != null){21 fast = fast.next;22 lazy = cur;23 cur = cur.next;24 }25 lazy.next = cur.next;26 return header.next;27 }28 }
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