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。

  1. //Definition for singly-linked list.
  2. struct ListNode {
  3. int val;
  4. ListNode *next;
  5. ListNode(int x) : val(x), next(NULL) {}
  6. };
  7.  
  8. class Solution {
  9. public:
  10. ListNode* removeElements(ListNode* head, int val) {
  11. ListNode fakeHead = ListNode(); //伪头部,化简代码
  12. fakeHead.next = head;
  13. ListNode *p = &fakeHead;
  14. while(NULL != p->next)
  15. {
  16. 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
  17. p->next = p->next->next;
  18. else //当前位置的下一个不需要删除,把当前位置后移
  19. p = p->next;
  20. }
  21. return fakeHead.next;
  22. }
  23. };

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