題目給定一個已排序好的linked list，要求將所有重複的node皆刪除，使得每個元素均只出現一次。
Given a sorted linked list, delete all duplicates such that each element appear only once.
2020-02-20
2020-02-07
LeetCode: Merge Two Sorted Lists
回傳兩個已經排序過的linked list的合併，僅能使用原有的linked list回傳。
Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.
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