题目大意:n个点,任意几个点组合后得到的点距离原点的最远距离. 题解:极角排序:https://blog.csdn.net/qq_39942341/article/details/79840394 利用极角排序,将这些点看成与原点相作用的向量,然后根据平行四边行法则,两向量之间的角度相差越小,其复合得到的向量的长度越长. #include<bits/stdc++.h> using namespace std; ; struct stu{ double a,b; bool friend oper…

链接 problem 给出\(n\)个二元组\((x,y)\).最初位于原点\((0,0)\),每次可以从这\(n\)个二元组中挑出一个,然后将当前的坐标\((X,Y)\)变为\((X+x,Y+y)\),每个二元组只能被选一次.选出一些二元组,使得按照这些二元组移动后与原点的欧几里得距离最大.求这个距离. solution 将这\(n\)个二元组看做\(n\)个向量.移动方式遵循平行四边形定则.所以两个向量夹角越小,相加形成的和向量模长就越大.所以将这些向量按照极角排序.选择的向量肯定是一个区间…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4900 Problem Description There is an old country and the king fell in love with a devil. The devil always asks the king to do some crazy things. Although the king used to be wise and beloved by his peopl…

The following are few examples of game engines implemented with HTML5 and JavaScript: Construct 2: One of the first WebGL enabled HTML5 game engines. Exports purely to HTML5 and JavaScript. Uses Canvas only and is extensible with JavaScript plugins.…

AtCoder Regular Contest 061 C.Many Formulas 题意 给长度不超过\(10\)且由\(0\)到\(9\)数字组成的串S. 可以在两数字间放\(+\)号. 求所有方案的数字和. 思路 \(2^{|S|-1}\)枚举加号的放置状态 代码 Many Formulas D.Snuke's Coloring 题意 在一个\(H \times W(3 \le H,W \le 10^9)\)的棋盘上,有\(N(N \le 10^5)\)个格子被染成黑色,其余格子为白色.…

链接:http://agc001.contest.atcoder.jp/tasks/agc001_c 题解(官方): We use the following well-known fact about trees.Let T be a tree, and let D be the diameter of the tree. • If D is even, there exists an vertex v of T such that for each vertex w inT, the dis…

View engines, or template engines, allow you to maintain a clean separation between your presentation layer and the rest of your application. This post will demonstrate how to use the vision plugin with hapi to enable template support. index.js serve…

当前mysql实例的存储引擎信息可以从information_schema.engines 中查询到 例子: mysql> select * from information_schema.engines; +--------------------+---------+----------------------------------------------------------------+--------------+------+------------+ | ENGINE | SU…

我都出了F了……结果并没有出E……atcoder让我差4分上橙是啥意思啊…… C - Together 题意:把每个数加1或减1或不变求最大众数. #include<cstdio> #include<algorithm> using namespace std; int read_p,read_ca; inline int read(){ read_p=;read_ca=getchar(); ') read_ca=getchar(); +read_ca-,read_ca=getch…

D - Menagerie Time limit : 2sec / Memory limit : 256MB Score : 500 points Problem Statement Snuke, who loves animals, built a zoo. There are N animals in this zoo. They are conveniently numbered 1 through N, and arranged in a circle. The animal numbe…