摘要： In Python, code blocks don't have explicit begin/end or curly braces to mark beginning and end of the block. Instead, code blocks are defined by inden 阅读全文

摘要： A A 2 2 3 3 4 4， 一共4对扑克牌。请你把它们排成一行。要求：两个A中间有1张牌，两个2之间有2张牌，两个3之间有3张牌，两个4之间有4张牌。请填写出所有符合要求的排列中，字典序最小的那个。例如：22AA3344 比 A2A23344 字典序小。当然，它们都不是满足要求的答案。 请通过 阅读全文

摘要： 把abcd...s共19个字母组成的序列重复拼接106次，得到长度为2014的串。接下来删除第1个字母（即开头的字母a），以及第3个，第5个等所有奇数位置的字母。得到的新串再进行删除奇数位置字母的动作。如此下去，最后只剩下一个字母，请写出该字母。答案是一个小写字母，请通过浏览器提交答案。不要填写任何 阅读全文

摘要： Sasha and Kolya decided to get drunk with Coke, again. This time they have k types of Coke. i-th type is characterised by its carbon dioxide concentra 阅读全文

摘要： It's New Year's Eve soon, so Ivan decided it's high time he started setting the table. Ivan has bought two cakes and cut them into pieces: the first c 阅读全文

摘要： Bob programmed a robot to navigate through a 2d maze. The maze has some obstacles. Empty cells are denoted by the character '.', where obstacles are d 阅读全文

摘要： Your friend has n cards. You know that each card has a lowercase English letter on one side and a digit on the other. Currently, your friend has laid 阅读全文

摘要： You are given two positive integer numbers a and b. Permute (change order) of the digits of a to construct maximal number not exceeding b. No number i 阅读全文

摘要： Luba is surfing the Internet. She currently has n opened tabs in her browser, indexed from 1 to n from left to right. The mouse cursor is currently lo 阅读全文

摘要： Jamie loves sleeping. One day, he decides that he needs to wake up at exactly hh: mm. However, he hates waking up, so he wants to make waking up less 阅读全文