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.
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* struct ListNode *next;
* };
*/
struct ListNode* removeNthFromEnd(struct ListNode* head, int n) {
int i,l;
struct ListNode *L, *tmp;
L=head;
tmp = (struct ListNode* ) malloc( sizeof(struct ListNode* ) );
for(l=0;L!=NULL;l++)
{
L=L->next;
}
if(l==n) return head->next;
L=head;
for(i=0;i<l-n-1;i++)
{
L=L->next;
}
tmp=L->next;
L->next=tmp->next;
free(tmp);
return head;
}
没有使用双指针,注意头结点!!!!