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203. Remove Linked List Elements
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
题目大意:
删除链表中全部的目标元素。
代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | /** * 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) head = head->next; if (head == NULL) return NULL; ListNode * p = head->next; ListNode * q = head; while (p) { if (p->val != val) { q->next = p; q = p; } else { q->next = NULL; } p = p->next; } return head; } }; |
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