首页 > itarticle > leetcode 0203

leetcode 0203

admin 11月 13, 2020 0

Desicription

Remove all elements from a linked list of integers that have value val.

Example:

1 2	Input: 1->2->6->3->4->5->6, val = 6 Output: 1->2->3->4->5

Solution


 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class  {
public:
    ListNode* removeElements(ListNode* head, int val) {
        while(head) {
            if(head->val == val) {
                ListNode* tmp = head;
                head = head->next;
                free(tmp);
            }
            else
                break;
        }
        ListNode* trav = head;
        while(trav) {
            while(trav->next && trav->next->val == val) {
                ListNode* tmp = trav->next;
                trav->next = trav->next->next;
                free(tmp);
            }
            trav = trav->next;
        }
        return head;
    }
};