Remove all elements from a linked list of integers that have value val.
Example Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5
AC代码如下：
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* removeElements(ListNode* head, int val) {
while(head!=NULL&&head->val==val)//遍历到第一个节点值不等于val的节点
head=head->next;
ListNode* ret=head;//返回指针
ListNode* p;//保存要删除节点的前一个节点指针
while(head!=NULL){
p=head;
head=head->next;
while(head!=NULL&&head->val==val)
head=head->next;
p->next=head;
}
return ret;
}
};
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