Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 186    Accepted Submission(s): 124 Problem Description The sky was brushed clean by the wind and the stars were cold in a bl…

Dancing Stars on Me Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5533 Description The sky was brushed clean by the wind and the stars were cold in a black sky. What a wonderful night. You observed that, somet…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5533 Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 601    Accepted Submission(s): 320 Problem Description The sky was brush…

Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 592    Accepted Submission(s): 315 Problem Description The sky was brushed clean by the wind and the stars were cold in a b…

Dancing Stars on Me Problem Description The sky was brushed clean by the wind and the stars were cold in a black sky. What a wonderful night. You observed that, sometimes the stars can form a regular polygon in the sky if we connect them properly. Yo…

Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 223    Accepted Submission(s): 151 Problem Description The sky was brushed clean by the wind and the stars were cold in a bl…

题意:给定二维平面上的n个整点,问它们是否都在正n边形的定点上 n<=100,abs(x[i]),abs(y[i])<=1e4 思路:队友做的,抱大腿 可以发现只有n=4时顶点有可能都是整点,判一下对角线与边长就行 我与队友互演,WA了5发…… #include<bits/stdc++.h> using namespace std; #define LL long long ; struct node{ int x,y; }a[maxn]; int dis(int i,int j)…

链接:传送门 题意:给出 n 个点,判断能不能构成一个正 n 边形,这 n 个点坐标是整数 思路:这道题关键就在与这 n 个点坐标是正整数!!!可以简单的分析,如果 n != 4,那一定就不能构成正 n 边形,否则暴力一下找到最小距离,这个最小距离一定是最短边长,暴力查找一下等于这个边长边的个数,如果是 4 个就能构成正 4 边形了 balabala: 分析 + 暴力出奇迹,出题人还是蛮有趣的!希望能在比赛中get到这些关键点. A strong man will struggle with t…

Problem Description The sky was brushed clean by the wind and the stars were cold in a black sky. What a wonderful night. You observed that, sometimes the stars can form a regular polygon in the sky if we connect them properly. You want to record the…

Time Limit: 1000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 930    Accepted Submission(s): 200 Problem Description Can you believe it? After Gardon had solved the problem, Angel accepted him! They were sitt…

Problem Description The sky was brushed clean by the wind and the stars were cold in a black sky. What a wonderful night. You observed that, sometimes the stars can form a regular polygon in the sky if we connect them properly. You want to record the…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5533 题意:平面图中 有n个点给你每个点的坐标,判断是否能通过某种连线使得这些点所组成的n边形为 正n变形: 很容易发现在一个n变形中,所有的点之间的距离只有n/2种,所以我们只需判断一下这n个点之间的距离是否只有n/2种即可; #include<stdio.h> #include<string.h> #include<algorithm> #include<iost…

Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 2002    Accepted Submission(s): 1168 Problem Description The sky was brushed clean by the wind and the stars were cold in a…

Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 582    Accepted Submission(s): 308 Problem Description The sky was brushed clean by the wind and the stars were cold in a b…

Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 1098    Accepted Submission(s): 598 Problem Description The sky was brushed clean by the wind and the stars were cold in a b…

5532 Almost Sorted Array 题目大意:给你一个序列,如果它拿掉其中一个数后,可以是该序列成为非递减或非递增序列,则输出YES. 有两种思路,第一种代码比较简单,是LIS,复杂度nlogn,第二种是On的复杂度. LIS的代码如下. #include <set> #include <queue> #include <cstdio> #include <vector> #include <cstring> #include &l…

Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 286    Accepted Submission(s): 185 Problem Description The sky was brushed clean by the wind and the stars were cold in a bl…

Dancing Stars on Me Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 2460    Accepted Submission(s): 1420 Problem Description The sky was brushed clean by the wind and the stars were cold in a…

弱没机会去长春,但拿了题来做了,加上请教各路大牛,理论AC了一发,但没实现~(感谢各路有形无形的大牛的指导) A题~Too Rich 给你1,5,10,20,50,100,200,500,1000,2000这几个数的个数,用最多的数组成和为p. 解:一眼看上去像个贪心题,其实,如果没有20,50,200,500这样怪的数,确实只是一个 简单的贪心题.转换一下题目,求p用最多的数组成,设S是所有数的和,即要求s-p用最少的 数组成.对于60,如果贪心的话,对20,20,20,50而言,很明显会造成…

//第一期 计算几何题的特点与做题要领: 1.大部分不会很难,少部分题目思路很巧妙 2.做计算几何题目,模板很重要,模板必须高度可靠. 3.要注意代码的组织,因为计算几何的题目很容易上两百行代码,里面大部分是模板.如果代码一片混乱,那么会严重影响做题正确率. 4.注意精度控制. 5.能用整数的地方尽量用整数,要想到扩大数据的方法(扩大一倍,或扩大sqrt2).因为整数不用考虑浮点误差,而且运算比浮点快. 一.点,线,面,形基本关系,点积叉积的理解 POJ 2318 TOYS(推荐) http:/…

1. Exact Cover Problem DLX是用来解决精确覆盖问题行之有效的算法. 在讲解DLX之前,我们先了解一下什么是精确覆盖问题(Exact Cover Problem)? 1.1 Polyomino 多联骨牌(Polyomino)是一种类似于七巧板的棋盘游戏: 如下图所示,除去中间\(4\)个方格不允许放置任何东西,这个棋盘总共有\(8*8-4=60\)个方格 将这\(12\)个由\(5\)个方格组成的图形全部放入到棋盘中,满足每个格子都被使用,而且只被使用一次. 每个格子都被覆…

精确覆盖问题的定义:给定一个由0-1组成的矩阵,是否能找到一个行的集合,使得集合中每一列都恰好包含一个1 例如:如下的矩阵 就包含了这样一个集合(第1.4.5行) 如何利用给定的矩阵求出相应的行的集合呢?我们采用回溯法 矩阵1: 先假定选择第1行,如下所示: 如上图中所示,红色的那行是选中的一行,这一行中有3个1,分别是第3.5.6列. 由于这3列已经包含了1,故,把这三列往下标示,图中的蓝色部分.蓝色部分包含3个1,分别在2行中,把这2行用紫色标示出来 根据定义,同一列的1只能有1个,故紫色的…

题目: poj 2352 Stars 数星星 题意:已知n个星星的坐标.每个星星都有一个等级,数值等于坐标系内纵坐标和横坐标皆不大于它的星星的个数.星星的坐标按照纵坐标从小到大的顺序给出,纵坐标相同时则按照横坐标从小到大输出. (0 <= x, y <= 32000) 要求输出等级0到n-1之间各等级的星星个数. 分析: 这道题不难想到n平方的算法,即从纵坐标最小的开始搜,每次找它前面横坐标的值比它小的点的个数,两个for循环搞定,但是会超时. 所以需要用一些数据结构去优化,主要是优化找 横坐…

POJ2318 本题需要运用to left test不断判断点处于哪个分区,并统计分区的点个数(保证点不在边界和界外),用来做叉积入门题很合适 //计算几何-叉积入门题 //Time:157Ms Memory:828K #include<iostream> #include<cstring> #include<cstdio> #include<algorithm> using namespace std; #define MAXN 5005 struct P…

最大三角形 Time Limit: 5000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4015    Accepted Submission(s): 1433 Problem Description 老师在计算几何这门课上给Eddy布置了一道题目,题目是这样的:给定二维的平面上n个不同的点,要求在这些点里寻找三个点,使他们构成的三角形拥有的面积最大.Eddy对这道…

http://www.cnblogs.com/acsmile/archive/2011/05/09/2040918.html 计算几何头疼的地方一般在于代码量大和精度问题,代码量问题只要平时注意积累模板一般就不成问题了.精度问题则不好说,有时候一个精度问题就可能成为一道题的瓶颈,简直“画龙点睛”.这些年的题目基本是朝着越来越不卡精度的方向发展了,但是也不乏一些%^&%题#$%$^,另外有些常识不管题目卡不卡,都是应该知道的.今天我就开膛回顾下见过且还有印象的精度问题,由于本人见识和记忆均有限,望…

Treasure Map Time Limit: 2 Seconds      Memory Limit: 32768 KB Your boss once had got many copies of a treasure map. Unfortunately, all the copies are now broken to many rectangular pieces, and what make it worse, he has lost some of the pieces. Luck…

1017 - Exact cover 时间限制:15秒 内存限制:128兆 自定评测 5584 次提交 2975 次通过 题目描述 There is an N*M matrix with only 0s and 1s, (1 <= N,M <= 1000). An exact cover is a selection of rows such that every column has a 1 in exactly one of the selected rows. Try to find o…

Stars Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 30496   Accepted: 13316 Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a st…

Stars in Your Window Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11706   Accepted: 3183 Description Fleeting time does not blur my memory of you. Can it really be 4 years since I first saw you? I still remember, vividly, on the beaut…