LeetCode 83. Remove Duplicates from Sorted List

83. Remove Duplicates from Sorted List

class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        ListNode dummy(-1);
        dummy.next = head;
        ListNode* walk = &dummy;
        ListNode* stop = &dummy;
        int val1 = 0xefffffff;
        while(walk->next !=NULL){
            walk = walk->next;
            int val2 = walk->val;
            if(val1 !=val2){
                stop->next = walk;
                stop = walk;
                val1 = val2;
            }   
        }
        if(stop != walk)
            stop->next = walk->next;
        return dummy.next;
    }
};