Closed Fences A closed fence in the plane is a set of non-crossing, connected line segments with N corners (3 < N < 200). The corners or vertices are each distinct and are listed in counter-clockwise order in an array {xi, yi}, i in (1..N). Every pa…

Electric Fences Kolstad & Schrijvers Farmer John has decided to construct electric fences. He has fenced his fields into a number of bizarre shapes and now must find the optimal place to locate the electrical supply to each of the fences. A single wi…

Closed Fences A closed fence in the plane is a set of non-crossing, connected line segments with N corners (3 < N < 200). The corners or vertices are each distinct and are listed in counter-clockwise order in an array {xi, yi}, i in (1..N). Every pa…

All Latin Squares 题目大意 n x n矩阵(n=2->7) 第一行1 2 3 4 5 ..N 每行每列,1-N各出现一次,求总方案数 题解 n最大为7 显然打表 写了个先数值后位置的暴搜 #include <bits/stdc++.h> #define rep(i,a,n) for (int i=a;i<n;i++) #define per(i,a,n) for (int i=n-1;i>=a;i--) using namespace std; const…

其实日期没有那么近啦……只是我偶尔还点进去造成的,导致我没有每一章刷完的纪念日了 但是全刷完是今天啦 讲真,题很锻炼思维能力,USACO保持着一贯猎奇的题目描述,以及尽量不用高级算法就完成的题解……例如用暴搜加优化代替插头dp 但是第6章!我就说第6章!为什么大赛的实践,几乎全是暴搜!是为了传达给我们不如暴搜吗?! 但是总之是结束了……想了想,从初二暑假刷了两章,然后一年陆陆续续刷完较难的四章…… 唉,一年了啊……下周也该中考了……7月份还得去noi被各大神犇完虐……仅代表辽宁省最低水平…… 一…

题目描述 在本题中,格点是指横纵坐标皆为整数的点. 为了圈养他的牛,农夫约翰(Farmer John)建造了一个三角形的电网.他从原点(0,0)牵出一根通电的电线,连接格点(n,m)(0<=n<32000,0<m<32000),再连接格点(p,0)(p>0),最后回到原点. 牛可以在不碰到电网的情况下被放到电网内部的每一个格点上(十分瘦的牛).如果一个格点碰到了电网,牛绝对不可以被放到该格点之上(或许Farmer John会有一些收获).那么有多少头牛可以被放到农夫约翰的电网…

Area Time Limit: 1000MS Memory Limit: 10000K Description Being well known for its highly innovative products, Merck would definitely be a good target for industrial espionage. To protect its brand-new research and development facility the company has…

Cows Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 6199   Accepted: 2822 Description 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 f…

       首先说明一下,hibernate的延迟加载特性(lazy).所谓的延迟加载就是当真正需要查询数据时才执行数据加载操作.因为hibernate当中支持实体对象,外键会与实体对象关联起来.如果没有这一特性,当查询某一个含有外键的实体对象时,hibernate会把其他实体对象的数据都查询出来.简单的来说,当你想查询某个对象时,实际上调用了多条查询语句.有了延迟加载特性,就避免了这种情况的发生,当你真正的使用get另外一个实体对象时,才再执行下面一条查询语句.           但有些时…

Android 程序开发完成后,如果要发布到互联网上供别人使用,就需要将自己的程序打包成Android 安装包文件(Android Package,APK),其扩展名为.apk.使用run as 也能生成一个APK安装包,但是使用run as 生成的是测试的安装包,只供开发者自己测试使用. 接下来就以HelloWord程序为例演示如何生成正式的APK文件. 1.右键项目名称,依次选择Android Tools——>Explort Signed Application Package,如图所示:…