LeetCode 83. 删除排序链表中的重复元素

题目描述

83. 删除排序链表中的重复元素

解法

一组快慢指针就搞定了

/** * 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) {
    
        if (head == nullptr) return nullptr;
        ListNode* slow = head;
        ListNode* fast = head;
        while (fast != nullptr)
        {
    
            if (fast->val != slow->val)
            {
    
                slow->next = fast;
                slow = slow->next;
            }
            fast = fast->next;
        }
        slow->next = nullptr;
        return head;
    }
};