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Description: You are given a string representing an attendance record for a student. The record only contains the following three characters: 'A' : Ab 阅读全文
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Description: On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or 阅读全文
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Description: Given an integer n, return the number of trailing zeroes in n!. Example 1: Input: 3 Output: 0 Explanation: 3! = 6, no trailing zero. Exam 阅读全文
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Description: You are given an array of strings words and a string chars. A string is good if it can be formed by characters from chars (each character 阅读全文
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Description: Given a matrix A, return the transpose of A. The transpose of a matrix is the matrix flipped over it's main diagonal, switching the row a 阅读全文
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Description Given an array A of strings made only from lowercase letters, return a list of all characters that show up in all strings within the list 阅读全文