83. Remove Duplicates from Sorted List

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class Solution
{
public:
    // ListNode* deleteDuplicates(ListNode* head)
    ListNode* deleteDuplicates(ListNode *m_head)
    {
        if(!m_head) return nullptr;

        for(auto iter = m_head; iter->next; )
        {
            if(iter->val == iter->next->val)
                iter->next = iter->next->next;
            else
                iter = iter->next;
        }

        return m_head;
    }
};