题解 | #删除有序链表中重复的元素-I#

/**
 * struct ListNode {
 *	int val;
 *	struct ListNode *next;
 *	ListNode(int x) : val(x), next(nullptr) {}
 * };
 */
class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        auto fast = head, slow = head;
        while (fast) {
            while (fast && fast->val == slow->val) fast = fast->next;
            slow->next = fast;
            slow = slow->next;
        }
        return head;
    }
};