摘要：描述 给你n根火柴棍，你可以拼出多少个形如“A+B=C”的等式？等式中的A、B、C是用火柴棍拼出的整数（若该数非零，则最高位不能是0）。用火柴棍拼数字0-9的拼法如图所示： 注意： 1. 加号与等号各自需要两根火柴棍 2. 如果A≠B，则A+B=C与B+A=C视为不同的等式（A、B、C>=0） 3. 阅读全文

摘要：Petr stands in line of n people, but he doesn't know exactly which position he occupies. He can say that there are no less than a people standing in f 阅读全文

摘要：You are given a broken clock. You know, that it is supposed to show time in 12- or 24-hours HH:MM format. In 12-hours format hours change from 1 to 12 阅读全文

摘要：描述 Jim is fond of reading books, and he has so many books that sometimes it's hard for him to manage them. So he is asking for your help to solve this 阅读全文

摘要：描述 A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = <x1, x2, ..., xm> another 阅读全文