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DescriptionProblems in Computer Science are often classified as belonging to a certain class of problems (e.g., NP, Unsolvable, Recursive). In this pr... 阅读全文
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DescriptionIn 1949 the Indian mathematician D.R. Kaprekar discovered a class of numbers called self-numbers. For any positive integer n, define d(n) t... 阅读全文
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DescriptionThe king pays his loyal knight in gold coins. On the first day of his service, the knight receives one gold coin. On each of the next two d... 阅读全文
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DescriptionMany graduate students of Peking University are living in Wanliu Campus, which is 4.5 kilometers from the main campus – Yanyuan. Students i... 阅读全文
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DescriptionBill and Ted are taking a road trip. But the odometer in their car is broken, so they don't know how many miles they have driven. Fortunate... 阅读全文
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Description题目描述：大家知道，给出正整数n，则1到n这n个数可以构成n！种排列，把这些排列按照从小到大的顺序（字典顺序）列出，如n=3时，列出1 2 3，1 3 2，2 1 3，2 3 1，3 1 2，3 2 1六个排列。任务描述：给出某个排列，求出这个排列的下k个排列，如果遇到最后一个... 阅读全文
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DescriptionUgly numbers are numbers whose only prime factors are 2, 3 or 5. The sequence 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, ... shows the first 10 ugly n... 阅读全文
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DescriptionWrite a program to read four lines of upper case (i.e., all CAPITAL LETTERS) text input (no more than 72 characters per line) from the inpu... 阅读全文
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DescriptionIf a and d are relatively prime positive integers, the arithmetic sequence beginning witha and increasing by d, i.e., a, a + d,a + 2d, a + ... 阅读全文
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DescriptionA checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum... 阅读全文