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题目 The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N 阅读全文
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题目 Eva loves to collect coins from all over the universe, including some other planets like Mars. One day she visited a universal shopping mall which 阅读全文
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题目 Zhejiang University has 40,000 students and provides 2,500 courses. Now given the registered course list of each student, you are supposed to outpu 阅读全文