[Leetcode] Remove Duplicates from Sorted List

最新推荐文章于 2022-04-03 22:46:44 发布

原创最新推荐文章于 2022-04-03 22:46:44 发布 · 402 阅读

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/**
 * 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
        if (!head) return NULL;
        
        ListNode* prev = head;
        ListNode* cur = head->next;
        
        if (!cur) return head;
        
        while (cur)
        {
            if (cur->val == prev->val)
            {
                prev->next = cur->next;
                delete cur;
                cur = prev->next;
            }
            else
            {    
                prev = cur;
                cur = cur->next;                
            }
        }
        
        return head;
    }
};

/**
 * 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
        if (!head) return NULL;
        
        ListNode** front = &head;
        ListNode* cur = head->next;
        
        while (cur)
        {
            if (cur->val != (*front)->val)
            {
                front = &(*front)->next;
                *front = cur;                
            }
            cur = cur->next;
        }
        front = &(*front)->next;
        *front = NULL;
        
        return head;
    }
};