Remove Duplicates from Sorted List.cpp

/**
 * 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) {
        auto curr = head;
        while(curr)
        {
            auto next = curr->next;
            while(next && curr->val == next->val)
                next = next->next;
            curr->next = next;
            curr = curr->next;
        }
        return head;
    }
};