标签:
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
.
思路:
简单题,没什么好说的。
class Solution { public: ListNode *deleteDuplicates(ListNode *head) { if(head == NULL) return NULL; ListNode * ans = head; ListNode * anscur = ans; //记录答案链表的最后一个指针 ListNode * cur = head->next; //记录判断的是原链表中的哪一个指针 while(cur != NULL) { if(anscur->val != cur->val) //只有值变化的时候才把指针接到ans链表后面 节省操作 { anscur->next = cur; anscur = anscur->next; } cur = cur->next; } anscur->next = NULL; //防止最后的指针是重复的,给ans结尾 return ans; } };
大神的代码更加简洁, 没有必要新建一个头结点,就用原来的头结点就好。
class Solution { public: ListNode *deleteDuplicates(ListNode *head) { if(NULL == head) return head; ListNode *cur = head, *nxt = head->next; while (nxt) { if (cur->val != nxt->val) cur = cur->next = nxt; else if (!nxt->next) cur->next = nxt->next; nxt = nxt->next; } return head; } };
【leetcode】Remove Duplicates from Sorted List (easy)
标签:
原文地址:http://www.cnblogs.com/dplearning/p/4232188.html