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給定一個數值不重複的已排序陣列和目標值，題目要求找出該目標值在這個陣列中的索引位置；若找不到則回傳插入數值的正確排序位置。

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.

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.

找出陣列裡元素的重複字元，沒有共同重複字元則回傳空字串。

Write a function to find the longest common prefix string amongst an array of strings.

If there is no common prefix, return an empty string "".

在一組陣列中找出兩個數，其加總恰等於給定值。 每個數不能被重複使用，且必剛好只有一個解。

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.