随笔分类 - PTA甲级
摘要：Given two strings S1 and S2, S=S1−S2 is defined to be the remaining string after taking all the characters in S2 from S1. Your task
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摘要：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. F
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摘要：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 cou
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摘要：Zhejiang University has 40,000 students and provides 2,500 courses. Now given the registered course list of each student, you are supposed to output t
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摘要：The task is really simple: given N exits on a highway which forms a simple cycle, you are supposed to tell the shortest distance between any pair of e
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摘要：Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off th
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摘要：Shopping in Mars is quite a different experience. The Mars people pay by chained diamonds. Each diamond has a value (in Mars dollars M$). When making
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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：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：Being unique is so important to people on Mars that even their lottery is designed in a unique way. The rule of winning is simple: one bets on a numbe
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摘要：Given a string, you are supposed to output the length of the longest symmetric sub-string. For example, given Is PAT&TAP symmetric?, the longest symme
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摘要：Zhejiang University has 40000 students and provides 2500 courses. Now given the student name lists of all the courses, you are supposed to output the
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摘要：Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given { 32, 321, 3214, 0229, 87 }, we c
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摘要：The magic shop in Mars is offering some magic coupons. Each coupon has an integer N printed on it, meaning that when you use this coupon with a produc
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摘要：1036 Boys vs Girls (25分) This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all
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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：One way that the police finds the head of a gang is to check people's phone calls. If there is a phone call between A and B, we say that A and B is re
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摘要：With highways available, driving a car from Hangzhou to any other city is easy. But since the tank capacity of a car is limited, we have to find gas s
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摘要：To store English words, one method is to use linked lists and store a word letter by letter. To save some space, we may let the words share the same s
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摘要：Given any string of N (≥) characters, you are asked to form the characters into the shape of U. For example, helloworld can be printed as: h d e l l r
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