摘要： Description C国的死对头A国这段时间正在进行军事演习，所以C国间谍头子Derek和他手下Tidy又开始忙乎了。A国在海岸线沿直线布置了N个工兵营地,Derek和Tidy的任务就是要监视这些工兵营地的活动情况。由于采取了某种先进的监测手段，所以每个工兵营地的人数C国都掌握的一清二楚,每个工 阅读全文

摘要： Description 7月17日是Mr.W的生日，ACM-THU为此要制作一个体积为Nπ的M层生日蛋糕，每层都是一个圆柱体。 设从下往上数第i(1 <= i <= M)层蛋糕是半径为Ri, 高度为Hi的圆柱。当i < M时，要求Ri > Ri+1且Hi > Hi+1。 由于要在蛋糕上抹奶油，为尽可 阅读全文

摘要： Description Let us consider the sequence a1, a2,..., an of non-negative integer numbers. Denote as ci,j the number of occurrences of the number i amon 阅读全文

摘要： Description For a set of sequences of integers｛a1，a2，a3，...an｝, we define a sequence｛ai1,ai2,ai3...aik｝in which 1<=i1<i2<i3<...<ik<=n, as the sub-sequ 阅读全文

摘要： Problem Description FatMouse prepared M pounds of cat food, ready to trade with the cats guarding the warehouse containing his favorite food, JavaBean 阅读全文

摘要： Problem Description There is a strange lift.The lift can stop can at every floor as you want, and there is a number Ki(0 <= Ki <= N) on every floor.Th 阅读全文

摘要： Problem Description After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because Turing Tree could easily have 阅读全文

摘要： Problem Description Tired of playing computer games, alpc23 is planning to play a game on numbers. Because plus and subtraction is too easy for this g 阅读全文

摘要： Description Given a connected, undirected graph G = (V, E), where V is the vertex set consisting a collection of nodes, and E is the set of edges, eac 阅读全文

摘要： Description Nemo is a naughty boy. One day he went into the deep sea all by himself. Unfortunately, he became lost and couldn't find his way home. The 阅读全文