[C语言][LeetCode][83]Remove Duplicates from Sorted List

题目

Remove Duplicates from Sorted List
Given a sorted linked list, delete all duplicates such that each element appear only once.

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

标签

Linked List

难度

简单

分析

题目意思是给定一个单链表，去除重复的节点，返回新链表。解题思路是，用一个临时指针指向list，如果p->val == p->next->val，则将p指针跳过p->next，指向p->next->next。

C代码实现

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     struct ListNode *next;
 * };
 */
struct ListNode* deleteDuplicates(struct ListNode* head) {
    struct ListNode * p;
    p = head;

    if(!head)
        return NULL;

    while(p && p->next)
    {
        if(p->val == p->next->val)
            p->next = p->next->next;
        else
            p = p->next;
    }

    return head;    
}