LeetCode之旅（15）

Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear onlyonce.

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

非常简单。

/** * 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) {        if (!head) return head;        ListNode *tail = head->next, *p = head;        for (; tail; tail=tail->next) {            if (p->val == tail->val)                p->next = tail->next;            else                p = p->next;        }        return head;    }};