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划拳是古老中国酒文化的一个有趣的组成部分。酒桌上两人划拳的方法为：每人口中喊出一个数字，同时用手比划出一个数字。如果谁比划出的数字正好等于两人喊出的数字之和，谁就赢了，输家罚一杯酒。两人同赢或两人同输则继续下一轮，直到唯一的赢家出现。 下面给出甲、乙两人的划拳记录，请你统计他们最后分别喝了多少杯酒。 阅读全文
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给定一个正数数列，我们可以从中截取任意的连续的几个数，称为片段。例如，给定数列 { 0.1, 0.2, 0.3, 0.4 }，我们有 (0.1) (0.1, 0.2) (0.1, 0.2, 0.3) (0.1, 0.2, 0.3, 0.4) (0.2) (0.2, 0.3) (0.2, 0.3, 0 阅读全文
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著名的快速排序算法里有一个经典的划分过程：我们通常采用某种方法取一个元素作为主元，通过交换，把比主元小的元素放到它的左边，比主元大的元素放到它的右边。 给定划分后的 N 个互不相同的正整数的排列，请问有多少个元素可能是划分前选取的主元？ 例如给定 $N = 5$, 排列是1、3、2、4、5。则： 1 阅读全文
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火星人是以 13 进制计数的： 地球人的 0 被火星人称为 tret。 地球人数字 1 到 12 的火星文分别为：jan, feb, mar, apr, may, jun, jly, aug, sep, oct, nov, dec。 火星人将进位以后的 12 个高位数字分别称为：tam, hel, 阅读全文
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Consider a positive integer N written in standard notation with k+1 digits ai as ak⋯a1a0 with 0 for all i and ak>0. Then N is palindrom 阅读全文
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The "eight queens puzzle" is the problem of placing eight chess queens on an 8 chessboard so that no two queens threaten each other. Thus, a solution 阅读全文
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John got a full mark on PAT. He was so happy that he decided to hold a raffle（抽奖） for his followers on Weibo -- that is, he would select winners from 阅读全文
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Given some segments of rope, you are supposed to chain them into one rope. Each time you may only fold two segments into loops and chain them into one 阅读全文
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"Damn Single (单身狗)" is the Chinese nickname for someone who is being single. You are supposed to find those who are alone in a big party, so they can 阅读全文
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Two integers are called "friend numbers" if they share the same sum of their digits, and the sum is their "friend ID". For example, 123 and 51 are fri 阅读全文
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"Let's C" is a popular and fun programming contest hosted by the College of Computer Science and Technology, Zhejiang University. Since the idea of th 阅读全文