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Leetcode: Remove Duplicates from Sorted List II

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.

For example,
Given 1->2->3->3->4->4->5, return 1->2->5.
Given 1->1->1->2->3, return 2->3.

分析:要充分利用sorted的性质,如果是sorted的那么重复的元素是连接在一起的,实现细节要注意删除node和未删除node指针向后移动的不同。

class Solution {public:    ListNode *deleteDuplicates(ListNode *head) {        if(head == NULL || head->next == NULL) return head;                int dup = INT_MAX;        ListNode *dummy = new ListNode(-1);        dummy->next = head;                for(ListNode *prev = dummy, *p = head; p;  p = prev->next){            if(p->val == dup){                prev->next = p->next;            }else if(p->next && p->val == p->next->val){                dup = p->val;                prev->next = p->next;            }else prev = p;        }        return dummy->next;    }};

 

Leetcode: Remove Duplicates from Sorted List II