随笔分类 - PAT
摘要：哈利·波特要考试了，他需要你的帮助。这门课学的是用魔咒将一种动物变成另一种动物的本事。例如将猫变成老鼠的魔咒是haha，将老鼠变成鱼的魔咒是hehe等等。反方向变化的魔咒就是简单地将原来的魔咒倒过来念，例如ahah可以将老鼠变成猫。另外，如果想把猫变成鱼，可以通过念一个直接魔咒lalala，也可以将
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摘要：“六度空间”理论又称作“六度分隔（Six Degrees of Separation）”理论。这个理论可以通俗地阐述为：“你和任何一个陌生人之间所间隔的人不会超过六个，也就是说，最多通过五个人你就能够认识任何一个陌生人。”如图1所示。 图1 六度空间示意图 “六度空间”理论虽然得到广泛的认同，并且正
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摘要：给定一个有N个顶点和E条边的无向图，请用DFS和BFS分别列出其所有的连通集。假设顶点从0到N−1编号。进行搜索时，假设我们总是从编号最小的顶点出发，按编号递增的顺序访问邻接点。 输入格式: 输入第1行给出2个整数N(0)和E，分别是图的顶点数和边数。随后E行，每行给出一条边的两个端点。每行中的数字
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摘要：将一系列给定数字插入一个初始为空的小顶堆H[]。随后对任意给定的下标i，打印从H[i]到根结点的路径。 输入格式: 每组测试第1行包含2个正整数N和M(≤)，分别是插入元素的个数、以及需要打印的路径条数。下一行给出区间[-10000, 10000]内的N个要被插入一个初始为空的小顶堆的整数。最后一行
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摘要：给定一个插入序列就可以唯一确定一棵二叉搜索树。然而，一棵给定的二叉搜索树却可以由多种不同的插入序列得到。例如分别按照序列{2, 1, 3}和{2, 3, 1}插入初始为空的二叉搜索树，都得到一样的结果。于是对于输入的各种插入序列，你需要判断它们是否能生成一样的二叉搜索树。 输入格式: 输入包含若干组
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摘要：算术表达式有前缀表示法、中缀表示法和后缀表示法等形式。日常使用的算术表达式是采用中缀表示法，即二元运算符位于两个运算数中间。请设计程序将中缀表达式转换为后缀表达式。 输入格式: 输入在一行中给出不含空格的中缀表达式，可包含+、-、*、\以及左右括号()，表达式不超过20个字符。 输出格式: 在一行中
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摘要：Given a constant K and a singly linked list L, you are supposed to reverse the links of every K elements on L. For example, given L being 1→2→3→4→5→6,
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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：People often have a preference among synonyms of the same word. For example, some may prefer "the police", while others may prefer "the cops". Analyzi
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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：For any 4-digit integer except the ones with all the digits being the same, if we sort the digits in non-increasing order first, and then in non-decre
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摘要：Given two sets of integers, the similarity of the sets is defined to be /, where Nc is the number of distinct common numbers shared by the two sets
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摘要：Programming Ability Test (PAT) is organized by the College of Computer Science and Technology of Zhejiang University. Each test is supposed to run sim
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摘要：Forbes magazine publishes every year its list of billionaires based on the annual ranking of the world's wealthiest people. Now you are supposed to si
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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：Excel can sort records according to any column. Now you are supposed to imitate this function. Input Specification: Each input file contains one test
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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：Behind the scenes in the computer's memory, color is always talked about as a series of 24 bits of information for each pixel. In an image, the color
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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：Given any positive integer N, you are supposed to find all of its prime factors, and write them in the format N = p1k1×p2k2×⋯×pm
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