LeetCode 83. Remove Duplicates from Sorted List

/**
 * 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==NULL)
            return head;
        ListNode* term = head;
        
        int pre = term->val;
        
        while(term->next!=NULL)
        {
            if(term->next->val == pre)
            {
                ListNode* temp = term->next->next;
                term->next = temp;
                continue;
            }
            
            pre = term->next->val;   
            term = term->next;
        }
        
        return head;
        
    }
};