题解 | #NC25 删除有序链表中重复的元素-I#

/**
 * struct ListNode {
 *    int val;
 *    struct ListNode *next;
 * };
 */

class Solution {
public:
    /**
     * 
     * @param head ListNode类 
     * @return ListNode类
     */
    ListNode* deleteDuplicates(ListNode* head) {
        // write code here
        ListNode* list = head;
        if(list == NULL){
           return list; 
        }

        //初始化
        ListNode* curNode = list;
        int curValue = list->val;
        list = list->next;

        while(list){
           if(list->val == curValue){
               curNode->next = list->next;
               ListNode* tmp = list;
               list = list->next;
               free(tmp);
           }
           else{
               curNode = list;
               curValue = list->val;
               list = list->next;
           }
        }
        return head;
    }
};