LeetCode 83. Remove Duplicates from Sorted List

题目描述:

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.

删除连表中的重复元素, 比较简单. 要注意不能造成内存泄漏.

/**
 * 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) {
        ListNode *node = head, *true_next;
        
        while(node){
            while(node->next != NULL && node->next->val == node->val){
                ListNode *toDel = node->next;
                node->next = node->next->next;
                delete toDel;
            }
            node = node->next;
        }
        
        return head;
    }
};