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题目如下： In an alien language, surprisingly they also use english lowercase letters, but possibly in a different order. The order of the alphabet is some 阅读全文
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题目如下： Given an array of integers A with even length, return true if and only if it is possible to reorder it such that A[2 * i + 1] = 2 * A[2 * i] for 阅读全文
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题目如下： We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each stri 阅读全文
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题目如下： Given two integers n and k, you need to construct a list which contains ndifferent positive integers ranging from 1 to n and obeys the following 阅读全文