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Nim游戏的概述： 还记得这个游戏吗？给出n列珍珠，两人轮流取珍珠，每次在某一列中取至少1颗珍珠，但不能在两列中取。最后拿光珍珠的人输。后来，在一份资料上看到，这种游戏称为“拈（Nim）”。据说，它源自中国，经由被贩卖到美洲的奴工们外传。辛苦的工人们，在工作闲暇之余，用石头玩游戏以排遣寂寞。后来流传 阅读全文
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David has a white board with 2×N2 \times N2×N grids.He decides to paint some grids black with his brush.He always starts at the top left corner and en 阅读全文
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Give a string SSS and NNN string TiT_iTi , determine whether TiT_iTi is a subsequence of SSS. If ti is subsequence of SSS, print YES,else print NO. 阅读全文
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Problem Description Taotao is glad to see that lots of students have registered for today's algorithm competition. Thus he wants to pull a banner on t 阅读全文
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DreamGrid City is a city with intersections arranged into a grid of rows and columns. The intersection on the -th row and the -th column can be descri 阅读全文
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Edward, the emperor of the Marjar Empire, wants to build some bidirectional highways so that he can reach other cities from the capital as fast as pos 阅读全文
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Last week, n students participated in the annual programming contest of Marjar University. Students are labeled from 1 to n. They came to the competit 阅读全文
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In mathematics, a polygonal number is a number represented as dots or pebbles arranged in the shape of a regular polygon. The dots are thought of as a 阅读全文
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Description It's easy for ACMer to calculate A^X mod P. Now given seven integers n, A, K, a, b, m, P, and a function f(x) which defined as following. 阅读全文
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A sequence of integers is called a peak, if and only if there exists exactly one integer such that , and for all , and for all . Given an integer sequ 阅读全文