(Leetcode 2021 刷题计划) 83. 删除排序链表中的重复元素

示例 1：
输入：head = [1,1,2]
输出：[1,2]

示例 2：
输入：head = [1,1,2,3,3]
输出：[1,2,3]

class Solution {
public:
    ListNode* deleteDuplicates(ListNode* head) {
        ListNode* curNode = head;
        while(curNode && curNode->next) {
            if (curNode->val == curNode->next->val) {
                ListNode* deleteNode = curNode->next;
                curNode->next = curNode->next->next;
                delete deleteNode;
            } else {
                curNode = curNode->next;
            }
        }
        return head;
    }
};