[Leetcode] Remove Duplicates from Sorted List II

最新推荐文章于 2022-04-03 22:46:44 发布

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本文介绍了一种优化算法，用于处理单链表中的重复节点问题，通过逐个检查并移除重复元素，确保链表的唯一性。

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode *deleteDuplicates(ListNode *head) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        ListNode* root = NULL;
        ListNode** ppNext = &root;
        
        while (head)
        {
            if (head->next == NULL || head->next->val != head->val)
            {
                *ppNext = head;
                ppNext = &(head->next);
                head = head->next;
            }
            else
            {
                int val = head->val;
                do
                {
                    head = head->next;
                } while (head != NULL && head->val == val);
            }
        }
        
        *ppNext = NULL;
        return root;
    }
};