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.
2020-02-12
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