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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 a string s of '(' , ')' and lowercase English characters. Your task is to remove the minimum number of parentheses ( '(' or ')', in any po 阅读全文
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题目如下： Given an array of integers nums and an integer k. A subarray is called nice if there are k odd numbers on it. Return the number of nice sub-arra 阅读全文
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题目如下： You are given two strings s1 and s2 of equal length consisting of letters "x" and "y" only. Your task is to make these two strings equal to each 阅读全文