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D - 4 CodeForces - 337AThe end of the school year is near and Ms. Manana, the teacher, will soon have to say goodbye to a yet another class. She decided to prepare a goodbye present for her n student...

A - 1 CodeForces - 510AFox Ciel starts to learn programming. The first task is drawing a fox! However, that turns out to be too hard for a beginner, so she decides to draw a snake instead.A snake is...

C - 3 HDU - 2059 (dp)C原题地址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...

C - 3 CodeForces - 469AThere is a game called “I Wanna Be the Guy”, consisting of n levels. Little X and his friend Little Y are addicted to the game. Each of them wants to pass the whole game.Littl...

集训进行了将近2个礼拜，这段时间以恢复性训练为主，我一直在密切关注大家的训练情况，目前为止，对大家的表现相当满意，首先是绝大部分队员的训练积极性很高，其次，都很遵守集训纪律，最后，老队员也起到了很好的带头作用，这里特别感谢为这次DP专题练习赛提供题目和测试数据的集训队队长xhd同学.特别高兴的是，跟随集训队训练的一批新队员表现非常好，进步也比较显著，特别是训练态度大大超出我的预期，我敢说，如果各...

B - 2 CodeForces - 82ASheldon, Leonard, Penny, Rajesh and Howard are in the queue for a “Double Cola” drink vending machine; there are no other people in the queue. The first one in the queue (Sheldo...

C - 3 HDU - 2191急！灾区的食物依然短缺！为了挽救灾区同胞的生命，心系灾区同胞的你准备自己采购一些粮食支援灾区，现在假设你一共有资金n元，而市场有m种大米，每种大米都是袋装产品，其价格不等，并且只能整袋购买。请问：你用有限的资金最多能采购多少公斤粮食呢？后记：人生是一个充满了变数的生命过程，天灾、人祸、病痛是我们生命历程中不可预知的威胁。月有阴晴圆缺，人有旦夕祸福，未来对...

E - 5 HDU - 1078FatMouse 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 < n...

A - 1 CodeForces - 509A （签到）A原题地址An n × n table a is defined as follows:The first row and the first column contain ones, that is: ai, 1 = a1, i = 1 for all i = 1, 2, …, n.Each of the remaining num...

G - 7 HDU - 1241The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large rectangular region of land at a time, and creates a gri...

A - 1 CodeForces - 711AA原题地址ZS the Coder and Chris the Baboon are travelling to Udayland! To get there, they have to get on the special IOI bus. The IOI bus has n rows of seats. There are 4 seats in...

C - A/B HDU - 1576要求(A/B)%9973，但由于A很大，我们只给出n(n=A%9973)(我们给定的A必能被B整除，且gcd(B,9973) = 1)。Input数据的第一行是一个T，表示有T组数据。每组数据有两个数n(0 <= n < 9973)和B(1 <= B &am

G - 7  HDU - 1241The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large rectangular region of land at a time, and creates a g...

C - 3 CodeForces - 451AAfter winning gold and silver in IOI 2014, Akshat and Malvika want to have some fun. Now they are playing a game on a grid made of n horizontal and m vertical sticks.An inters...

C - 3 CodeForces - 580AKefa decided to make some money doing business on the Internet for exactly n days. He knows that on the i-th day (1 ≤ i ≤ n) he makes ai money. Kefa loves progress, that’s why ...

B - 2 CodeForces - 69AA guy named Vasya attends the final grade of a high school. One day Vasya decided to watch a match of his favorite hockey team. And, as the boy loves hockey very much, even more...

C - 3 CodeForces - 271AIt seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.Now you are sug...

D - 4 CodeForces - 472AOne way to create a task is to learn from math. You can generate some random math statement or modify some theorems to get something new and build a new task from that.For exa...