此題要求將輸入的已排序陣列移除重複的項目，必須在同一陣列下操作，最後回傳陣列之長度。
Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length.
2020-02-10
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此題要求將輸入的已排序陣列移除重複的項目，必須在同一陣列下操作，最後回傳陣列之長度。
Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length.