随笔分类 - PAT
摘要：Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 2469135
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摘要：A Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, publishers, and published years
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摘要：Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to ou
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摘要：A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number
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摘要：A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a re
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摘要：It is vitally important to have all the cities connected by highways in a war. If a city is occupied by the enemy, all the highways from/toward that c
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摘要：To evaluate the performance of our first year CS majored students, we consider their grades of three courses only: C - C Programming Language, M - Mat
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摘要：With the 2010 FIFA World Cup running, football fans the world over were becoming increasingly excited as the best players from the best teams doing ba
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摘要：Given a pair of positive integers, for example, 6 and 110, can this equation 6 = 110 be true? The answer is yes, if 6 is a decimal number and 110 is a
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摘要：This time, you are supposed to find A×BA\times BA×B where AAA and BBB are two polynomials. Input Specification: Each input file contains one test case
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摘要：The highest building in our city has only one elevator. A request list is made up with N positive numbers. The numbers denote at which floors the elev
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摘要：1007 Maximum Subsequence Sum （25 分） Given a sequence of K integers { N1, N2, ..., NK }. A continuous subsequence is defined to be { Ni, N
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摘要：At the beginning of every day, the first person who signs in the computer room will unlock the door, and the last one who signs out will lock the door
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摘要：Given a non-negative integer N, your task is to compute the sum of all the digits of N, and output every digit of the sum in English. Input Specificat
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摘要：A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Specification: Each inp
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摘要：As an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities connected by some ro
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摘要：This time, you are supposed to find A+BA+BA+B where AAA and BBB are two polynomials. Input Specification: Each input file contains one test case. Each
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摘要：1001 A+B Format （20 分） Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (un
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