Description standard input/output Announcement   Statements There is a set of n segments with the lengths li. Find a segment with an integer length so that it could form a non-degenerate triangle with any two segments from the set, or tell that such…

standard input/output You must have heard about Agent Mahone! Dr. Ibrahim hired him to catch the cheaters in the Algorithms course. N students cheated and failed this semester and they all want to know who Mahone is in order to take revenge! Agent Ma…

Description standard input/output Announcement   Statements A permutation of n numbers is a sequence of integers from 1 to n where each number is occurred exactly once. If a permutation p1, p2, ..., pn has an index i such that pi = i, this index is c…

最近意志力好飘摇..不知道坚不坚持得下去.. 这么弱还瞎纠结...可以滚了.. 水题都不会做.. LCS (A) 水 LCS (B) 没有看题 Gym 100989C 水 1D Cafeteria (B) 不会捉 Gym 100989E 水 Gym 100989F 水 Mission in Amman (B) 没看题 Queue (A) 感觉题意理解得有问题啊 #include <iostream> #include <cstdio> #include <cstring>…

来源 poj 3348 Your friend to the south is interested in building fences and turning plowshares into swords. In order to help with his overseas adventure, they are forced to save money on buying fence posts by using trees as fence posts wherever possibl…

呵呵哒.WA了无数次,一开始想的办法最终发现都有缺陷.首先需要知道: 1)线段不相交,一定面积为0 2)有一条线段与X轴平行,面积一定为0 3)线段相交,但是能接水的三角形上面线段把下面的线段完全覆盖. (1),(2)的情况简单,主要是解决(3).下面对(3)进行讨论,如下图所示,设p1,p2是两线段各自位置较高的点,p0为两线段的交点,向量e是三角形p0p1p2的关于边p1p2的外侧法向量.则当e的终点位于第1,2象限时才会有积水,3,4象限是没有的.判断e的方向可以根据它与(p0p1+p0p…

Problem G. Grave 题目连接: http://codeforces.com/gym/100531/attachments Description Gerard develops a Halloween computer game. The game is played on a rectangular graveyard with a rectangular chapel in it. During the game, the player places new rectangul…

L. Ministry of Truth Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100187/problem/K Description Andrey works in the Ministry of Truth. His work is changing articles in newspapers and magazines so that they praise the Party an…

H. Mysterious Photos Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100187/problem/H Description Everyone probably heard the rumours about the constellation of Bermuda Triangle: any person who looks to this constellation of th…

C. CinderellaTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100685/problem/C Description Cinderella is given a task by her Stepmother before she is allowed to go to the Ball. There are N (1 ≤ N ≤ 1000) bottles with water in th…