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程式語言 - LeetCode - C++ - 82. Remove Duplicates from Sorted List II

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題目：


解答：

/**
 * 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 ans;
        ans.next = head;

        ListNode *pre = &ans;
        ListNode *cur = head;

        while (cur) {
            if (cur->next && cur->val == cur->next->val) {
                int v = cur->val;

                while (cur && cur->val == v) {
                    cur = cur->next;
                }

                pre->next = cur;
            }
            else {
                pre = cur;
                cur = cur->next;
            }
        }

        return ans.next;
    }
};