LeetCode Remove Duplicates from Sorted List

1.题目

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.

2.解决方案

class Solution {
public:
    ListNode *deleteDuplicates(ListNode *head) {
        if(!head)
          return NULL;
        ListNode* firstNode = head;
        ListNode* currentNode = head;
        ListNode* nextNode = head;
        while(currentNode->next){
            if(currentNode->val == currentNode->next->val){
                if(currentNode->next->next){
                    currentNode->next = currentNode->next->next;
                }else{
                    currentNode->next = NULL;
                }
            }else{
                currentNode = currentNode->next;
            }

        }
        return head;

    }
};

思路:比较简单的list删除操作。

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