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Constructing Roads In JGShining’s Kingdom HDU - 1025 JGShining’s kingdom consists of 2n(n is no more than 500,000) small cities which are located in two parallel lines. Half of these cities are rich

D. Office Keystime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputThere are n people and k keys on a straigh

Problem B: qwb与矩阵Time Limit: 2 Sec  Memory Limit: 128 MBSubmit: 1097  Solved: 210[Submit][Status][Web Board]Description做完了辣么多的数学题，qwb好好睡了一觉。但是他做了一个梦：有一个n*m的矩阵，qwb在这个矩阵的左上角(1,1)，终

B. Sagheer, the Hausmeistertime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputSome people leave the lights at

PearlsTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2666    Accepted Submission(s): 1316Problem DescriptionIn Pearlania everyb

重温世界杯Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6880    Accepted Submission(s): 2406Problem Description世界杯结束了,意大利人连本带利的收回了法

Human Gene FunctionsTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 3819    Accepted Submission(s): 2178Problem DescriptionIt is wel

C. Vladik and Memorable Triptime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputVladik often travels by trains. He remem

HDU - 2059 龟兔赛跑 据说在很久很久以前，可怜的兔子经历了人生中最大的打击——赛跑输给乌龟后，心中郁闷，发誓要报仇雪恨，于是躲进了杭州下沙某农业园卧薪尝胆潜心修炼，终于练成了绝技，能够毫不休息得以恒定的速度(VR m/s)一直跑。兔子一直想找机会好好得教训一下乌龟，以雪前耻。 最近正值HDU举办50周年校庆，社会各大名流齐聚下沙，兔子也趁此机会向乌龟发起挑战。虽然乌龟深知获胜希望不大

HDU - 1078 FatMouse and Cheese FatMouse has stored some cheese in a city. The city can be considered as a square grid of dimension n: each grid location is labelled (p,q) where 0 <= p < n and 0 <= q <

题意：相当于在一个n*n的棋盘上放k个车，并且互相不能吃，问有几种方法组合数学分析：任意两个不能同行不能同列，转换到线段上就是n行中选k行，n列中选k列，转换到二维就是将它们相乘那么就是  A(n,k)*A(n,k)/A(k,k)=C(n,k)*A(n,k)