随笔分类 - pat
problems from pat
摘要：It is said that in 2013, there were about 100 graduate schools ready to proceed over 40,000 applications in Zhejiang Province. It would help a lot if
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摘要：A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes
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摘要：There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at any s
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摘要：Indeed there are many different tourist routes from our city to Rome. You are supposed to find your clients the route with the least cost while gainin
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摘要：A traveler's map gives the distances between cities along the highways, together with the cost of each highway. Now you are supposed to write a progra
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摘要：Given a singly linked list, you are supposed to rearrange its elements so that all the negative values appear before all of the non-negatives, and all
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摘要：Given two strings S~1~ and S~2~, S = S~1~ - S~2~ is defined to be the remaining string after taking all the characters in S~2~ from S~1~. Your task is
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摘要：Shuffling is a procedure used to randomize a deck of playing cards. Because standard shuffling techniques are seen as weak, and in order to avoid "ins
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摘要：To prepare for PAT, the judge sometimes has to generate random passwords for the users. The problem is that there are always some confusing passwords
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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：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：Eva would like to make a string of beads with her favorite colors so she went to a small shop to buy some beads. There were many colorful strings of b
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摘要：Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are
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摘要：Given a syntax tree (binary), you are supposed to output the corresponding infix expression, with parentheses reflecting the precedences of the operat
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摘要：Given N rational numbers in the form "numerator/denominator", you are supposed to calculate their sum. Input Specification: Each input file contains o
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摘要：Given a sequence of positive integers and another positive integer p. The sequence is said to be a "perfect sequence" if M <= m * p where M and m are
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摘要：Formation is very important when taking a group photo. Given the rules of forming K rows with N people as the following: The number of people in each
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摘要：Scientific notation is the way that scientists easily handle very large numbers or very small numbers. The notation matches the regular expression [+-
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摘要：Mooncake is a Chinese bakery product traditionally eaten during the Mid-Autumn Festival. Many types of fillings and crusts can be found in traditional
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摘要：About 900 years ago, a Chinese philosopher Sima Guang wrote a history book in which he talked about people's talent and virtue. According to his theor
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