Stars Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 39186 Accepted: 17027 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 star b…

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 star be an amount of the stars that are not higher and not to the right of the given star. Astronomers wa…

emm,ssy说可以直接CDQ分治...%%%但是注意到y是有序的,所以可以直接求一下前缀和就行了. 题干: 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 star be an amount of the stars that are not higher…

题意:输入一n颗星星的x,y坐标,给定判断level的标准,即某颗星星左下边(不高于它,不超过他,相当于以他为基准的第三象限)星星的数目为level, 输出level从0到n的星星个数. //poj2352 #include <iostream> #include <string> #include <cstring> #include <queue> #include <vector> #include <cstdio> using…

https://vjudge.net/problem/POJ-2352 分析: 由于是按照y坐标的升序,y坐标向等的按x的升序的顺序给出星星.那么某个星星的等级数就是在他前面x坐标小于等于他的x坐标的星星的个数. 暴力的时间复杂度为n^2,超时 所以我们要记录前面所有x坐标出现的次数.然后要求出[0,xi]出现的和. 这就是静态二叉检索树 的标准问题了. #include <iostream> #include <cstdio> #include <cstring> #…

http://poj.org/problem?id=2352 #include <cstdio> #include <cstring> #define maxn 400000 using namespace std; int c[maxn],leve[maxn],a,b,n; int lowbit(int x) { )); } void add(int x,int m) { while(x<=maxn) { c[x]+=m; x+=lowbit(x); } } int sum…

经典问题:二维偏序.给定平面中的n个点,求每个点左下方的点的个数. 因为 所有点已经以y为第一关键字,x为第二关键字排好序,所以我们按读入顺序处理,仅仅需要计算x坐标小于<=某个点的点有多少个就行. 这就是所说的:n维偏序,一维排序,二维树状数组,三维 分治 Or 树状数组套平衡树…… <法一>树状数组. #include<cstdio> #include<algorithm> #include<iostream> using namespace st…

传送门 先按照下标x排序,然后依次把y加入树状数组,边加入边统计即可. 注意下标re从零开始,需+1s ——代码 # include <iostream> # include <cstdio> # include <cstring> # include <string> # include <cmath> # include <vector> # include <map> # include <queue>…

2019-05-20 22:52:07 加油,坚持,加油,坚持 !!! #include<iostream> #include<cstdio> #include<cstring> using namespace std; ; int c[MAXN],level[MAXN],n; int lowbit(int x){return x & (-x);} // 求前n项的和 int sum(int n){ ; ){ sum += c[n]; n -= lowbit(n…

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 star be an amount of the stars that are not higher and not to the right of the given star. As…

题目 Stars Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 34016   Accepted: 14839 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…

http://poj.org/problem?id=2352 Astronomers晚上仰望星空,看到了很多星星.回到办公桌,Astronomers将这些星星画到二维坐标系,每个星星的坐标都是整数.例如5个星星,坐标分别为(1,1), (5,1), (7,1), (3,3), (5,5): Astronomers想对这些星星定等级,规则是这样的:每个星星左下角有几个星星,它就算几级(包含左边和下面).上面的例子,第1颗星星的等级为0,等2颗星星的等级为1,第3颗星星的等级为2,第4颗星星的等级为…

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…

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…

Applet程序. import javax.swing.*; import java.awt.*; import java.awt.geom.GeneralPath; @SuppressWarnings("serial") public class StarApplet extends JApplet { // Initialize the applet @Override public void init() { StarPane pane = new StarPane(); //…

题目描述 "But baby, I've been, I've been praying hard,     Said, no more counting dollars     We'll be counting stars" Grandpa Shaw loves counting stars. One evening he was sitting in his armchar, trying to figure out this problem. Consider the sky…

Stars Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4052    Accepted Submission(s): 1592 Problem Description Astronomers often examine star maps where stars are represented by points on a plan…

Stars in Your Window   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 beautiful Zhuhai Campus, 4 years ago, from the moment I saw you smile, as you were walk…

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…

Stars Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 37323 Accepted: 16278 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 star b…

YJC counts stars Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5277 Description YJC是个老火车小司机.一个晚上,他仰望天空,星辰璀璨,他突然觉得,天空就像一个平面,而每一个星辰,就是平面中的一个点.他把这些点编号为1到n.这些点满足任意三点不共线.他把一些点用线段连起来了,但是任意两条线段不会在端点以外相交.如果一个点的集合中任意两个…

STARS的一般使用可以通过REGAL网页快速学习http://regionalanalysislab.org/?n=STARS再次不做详细介绍这里关注的主题是对STARS源代码分析即为使用Python直接从底层开发GIS的过程 STARS 0.8.2版本的下载链接中提供了两种类型:安装包和源代码包安装包可以直接安装运行,而源代码包可以通过Python编辑器编译后运行上述两种操作获得的效果是一样的 下载地址:1.安装包 http://prdownloads.sourceforge.net/sta…

STARS的全称是Space-Time Analysis of Regional Systems,直译过来就是区域系统时空分析软件.这是针对区域多时相数据的分析包,源代码公开.该软件将最近几年发展起来的时空分析技术引入到友好的用户界面中,设计目标是要成为一款探索性数据分析软件. 不得不说的是,探索性空间数据分析(ESDA)在国内才刚刚起步,而STARS面向的则是更为复杂的探索性时空数据分析(ESTDA).因而,多了解这样一个软件无异可以为国内GIS研究开辟一个新方向. 此软件为圣迭戈州立大学地理…

Stars Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 41521   Accepted: 18100 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…

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…

Stars Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6581    Accepted Submission(s): 2625 Problem Description Astronomers often examine star maps where stars are represented by points on a plan…

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 beautiful Zhuhai Campus, 4 years ago, from the moment I saw you smile, as you were walking out of the classroo…

Problem Description Yifenfei is a romantic guy and he likes to count the stars in the sky. To make the problem easier,we considerate the sky is a two-dimension plane.Sometimes the star will be bright and sometimes the star will be dim.At first,there…