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19. Remove Nth Node From End of List(C++)

2024-09-07 04:25:21   208人阅读

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.

Solution :
 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 myhead(0);
13         myhead.next=head;
14         ListNode *p=&myhead,*q=&myhead;
15         for(int i=0;i<n;i++) p=p->next;
16         while(p->next!=NULL){
17             p=p->next;
18             q=q->next;
19         }
20         q->next=q->next->next;
21         return myhead.next;
22     }
23 };

 

19. Remove Nth Node From End of List(C++)


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