【链表】leetcode_83_删除排序链表中的重复元素

【链表】leetcode_83_删除排序链表中的重复元素

c++

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode() : val(0), next(nullptr) {}
 *     ListNode(int x) : val(x), next(nullptr) {}
 *     ListNode(int x, ListNode *next) : val(x), next(next) {}
 * };
 */
class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        ListNode *dummyHead = new ListNode(10000);
        dummyHead->next = head;
        ListNode *cur = dummyHead;
        
        while(cur && cur->next){
            if (cur->val == cur->next->val){
            ListNode *tmp = cur->next;
            cur->next = cur->next->next;
            delete tmp;
            }else{
                cur = cur->next;
            }
        }
        ListNode *re = dummyHead->next;
        delete dummyHead;
        return re;
    }
};