【leetcode】Remove Linked List Elements(easy)
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
思路:简单题。
//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) {
ListNode fakeHead = ListNode(); //伪头部,化简代码
fakeHead.next = head;
ListNode *p = &fakeHead;
while(NULL != p->next)
{
if(p->next->val == val) //当前数字的下一个需要被删除 删掉后重新判断当前位置的下一个数
p->next = p->next->next;
else //当前位置的下一个不需要删除,把当前位置后移
p = p->next;
}
return fakeHead.next;
}
};
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