摘要： 题目描述 There is a rectangular room, covered with square tiles. Each tile is colored either red or black. A man is standing on a black tile. From a tile, 阅读全文

摘要： 题目： Description A magic island Geraldion, where Gerald lives, has its own currency system. It uses banknotes of several values. But the problem is, th 阅读全文

摘要： Description A math instructor is too lazy to grade a question in the exam papers in which students are supposed to produce a complicated formula for t 阅读全文

摘要： Description 在N*N的方格棋盘放置了N个皇后，使得它们不相互攻击（即任意2个皇后不允许处在同一排，同一列，也不允许处在与棋盘边框成45角的斜线上。 你的任务是，对于给定的N，求出有多少种合法的放置方法。 Description 在N*N的方格棋盘放置了N个皇后，使得它们不相互攻击（即任意 阅读全文

摘要： Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 10 阅读全文

摘要： 似乎已经习惯了从寝室出入机房，从机房出入食堂，三点一线的生活，暑假留在学校，确实是一个正确的选择，因为，这段时间，我可以无忧无虑的学习，再也不用担心考试，担心作业，担心查到，我只需要天天专注于一件事情，就是刷题~~~ 清晨起床，背上书包，从寝室出发，来到三点一线的机房，打开电脑，开始了一天的行... 阅读全文

摘要： 描述 A robot has to patrol around a rectangular area which is in a form of mxn grid (m rows and n columns). The rows are labeled from 1 to m. The column 阅读全文

摘要： Description Little Valentine liked playing with binary trees very much. Her favorite game was constructing randomly looking binary trees with capital 阅读全文

摘要： Description 某部队进行新兵队列训练，将新兵从一开始按顺序依次编号，并排成一行横队，训练的规则如下：从头开始一至二报数，凡报到二的出列，剩下的向小序号方向靠 拢，再从头开始进行一至三报数，凡报到三的出列，剩下的向小序号方向靠拢，继续从头开始进行一至二报数。。。，以后从头开始轮流进行一至二报 阅读全文

摘要： Description Two bored soldiers are playing card war. Their card deck consists of exactly n cards, numbered from 1 to n, all values are different. They 阅读全文