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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.
思路:先从头遍历等到长度length,在从头遍历,根据当前结点次序与长度length和n的关系确定要删除的结点。
1 /** 2 * Definition for singly-linked list. 3 * struct ListNode { 4 * int val; 5 * ListNode *next; 6 * ListNode(int x) : val(x), next(NULL) {} 7 * }; 8 */ 9 class Solution {10 public:11 ListNode *removeNthFromEnd(ListNode *head, int n) {12 ListNode *p=head,*q;13 int length=0;14 while(p!=NULL)15 {16 length++;17 p=p->next;18 }19 p=head;20 head=q;21 q->next=p;22 while(p!=NULL)23 {24 if(length==n)25 {26 q->next=p->next;27 break;28 }29 else30 {31 q=p;32 p=p->next;33 length--;34 }35 }36 return head->next;37 }38 };
LeetCode:Remove Nth Node From End of List
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