In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without disturbing the other straws. Here, we are only concerned with if various pairs of straws are connected b…

Jack Straws Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 5428   Accepted: 2461 Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one witho…

原题如下: Jack Straws Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 5555   Accepted: 2536 Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one…

http://poj.org/problem?id=1127   Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without disturbing the other straws. Here, we are only concerned wi…

Jack Straws Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 2911   Accepted: 1322 Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one witho…

Jack Straws In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without disturbing the other straws. Here, we are only concerned with if various pairs of straws are…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud Jack Straws Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 3512   Accepted: 1601 Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped o…

1840: Jack Straws 时间限制(普通/Java):1000MS/10000MS     内存限制:65536KByte 总提交: 168            测试通过:129 描述 In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without distu…

描述 In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without disturbing the other straws. Here, we are only concerned with if various pairs of straws are connecte…

Jack Straws Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without disturbing the other straws. Here, we are only concerned with if various pairs o…

Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try to remove them one-by-one without disturbing the other straws. Here, we are only concerned with if various pairs of straws are…

1840: Jack Straws  Time Limit(Common/Java):1000MS/10000MS     Memory Limit:65536KByteTotal Submit: 154            Accepted:119 Description In the game of Jack Straws, a number of plastic or wooden "straws" are dumped on the table and players try…

[题目链接] http://poj.org/problem?id=1127 [题目大意] 在二维平面中,给出一些木棍的左右端点,当木棍相交或者间接相交时 我们判断其连通,给出一些询问,问某两个木棍是否连通 [题解] 我们首先记录直接相连的木棍,然后对图跑一遍floyd算法,就能预处理出所有答案. [代码] #include <cstdio> #include <algorithm> #include <cmath> #include <cstring> us…

题目链接 抄的模版,居然1Y了.就是简单的线段相交+并查集. #include <iostream> #include <cstring> #include <cstdio> #include <cstdlib> #include <cmath> using namespace std; #define eps 1e-8 #define zero(x) (((x) > 0?(x):(-x))<eps) struct point { d…

题意: 给出一系列线段,判断某两个线段是否连通. 思路: 根据线段相交情况建立并查集, 在同一并查集中则连通. (第一反应是强连通分量...实际上只要判断共存即可, 具体的方向啊是没有关系的..) 并查集合并的时候是根节点合并. 快速排斥试验不是必需的, 大规模数据可能是个优化吧. 跨立试验注意共线的情况. 共线判断注意与y 轴平行的情况. #include <cstdio> #include <cstring> #include <cmath> using names…

题意:给定一堆线段,然后有询问,问这两个线段是不是相交,并且如果间接相交也可以. 析:可以用并查集和线段相交来做,也可以用Floyd来做,相交就是一个模板题. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include <cstdlib> #include <cmath> #includ…

题意: 有n个木棍,给出木棍的两个端点的x,y坐标,判断其中某两个线段是否连通(可通过其他线段连通) #include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> #include <cmath> #include <vector> #include <queue> #include <map> #include <…

题意:桌子上放着n根木棍,已知木棍两端的坐标.给定几对木棍,判断每对木棍是否相连.当两根木棍之间有公共点或可以通过相连的木棍间接的连在一起,则认为是相连的. 分析: 1.若线段i与j平行,且有部分重合,则相连.否则,求直线i与直线j交点,再判断该交点是否在两线段上,以确定是否相连. 2.flod整理一下所有的关系. 3.判断点是否在线段上:(线段i,点t) (1)外积(l[i] - t) × (r[i] - t) = 0, 可判断点x是否在直线i上(两向量叉乘为0,两向量平行) (2)内积(l[…

/** http://acm.tzc.edu.cn/acmhome/problemdetail.do?&method=showdetail&id=1840    题意:    判断线段是否相交  (包括间接相交)    输入:     N(代表有n条线段)     sx  sy  ex  ey(一条直线的两端点的坐标)     :     :     :     a b(判断第a条和第b条线段是否相交)     :     :      :     0 0输入0 0 询问结束     输出…

给你一些线段,求出哪些线段是相连的,哪些是不相连的.相连包括间接相连,即这两条线段本身不直接相连,而是通过其它线段的连接而间接相连. 线段相交+并查集 这里主要说如何判断线段相交:快速排斥试验+跨立试验牢记一点:研究对象一定是两条线段的四个端点 (快速排斥试验:只是可以证明这两条一定不相交,达到一点加速效果)以线段P1,P2为对角线作一矩形R,再以Q1,Q2为对角线作矩形T,当两个矩形不相交的时候两条线段肯定不相交,即线段相交的必要条件时矩形相交.矩阵相交依据:两条线段一共四个端点,x/y轴中,…

题目大意: 给定n条线段 接下来n行是端点信息 接下来询问 a b 是否相交 若a与c相交 b与c相交 ,那么a与b就是相交的 先判断任两条线段是否相交 再用folyd #include <cstdio> #include <cmath> #include <algorithm> #include <stdio.h> #include <string.h> using namespace std; ; double add(double a,do…

一 题面 POJ1127 二 分析 在平面几何中,判断两线段相交的方法一般是使用跨立实验.但是这题考虑了非严格相交,即如何两个线段刚好端点相交则也是相交的,所以还需要使用快速排斥实验. 这里参考并引用了TangMoon 博客. 1.快速排斥实验 由于两个点作为矩形的两个斜对角线端点可以确定一个矩形,则根据两个点确定一个向量,两个向量显然可以确定两个矩形. 对于快速排斥实验,也可尝试逆向思维,如果判断让两个向量确定的两个矩形是否相交部分,相当于判断两个矩形没有相交部分的反. 具体条件就是a.其中一…

%: 对于二维向量p1=(x1,y1),p2=(x2,y2),定义内积p1⋅p2=x1x2+y1y2,外积p1×p2=x1y2−y1x2,则判断点q是否在线段p1−p2上: 先利用外积判断q是否在直线p1p2上,(p1−q)×(p2−q)=0; 再利用内积判断q是否在线段p1−p2上,(p1−q)×(p2−q)≤0; 设直线p1−p2上的点为p1+t(p2−p1),则该点在线段q1−q2上有: (q1−q2)×(p1+t(p2−p1)−q2)=0 则交点为: p1+(q1−q2)×(q2−p1)…

poj 题目分类 按照ac的代码长度分类(主要参考最短代码和自己写的代码) 短代码:0.01K--0.50K:中短代码:0.51K--1.00K:中等代码量:1.01K--2.00K:长代码:2.01K以上. 短:1147.1163.1922.2211.2215.2229.2232.2234.2242.2245.2262.2301.2309.2313.2334.2346.2348.2350.2352.2381.2405.2406: 中短:1014.1281.1618.1928.1961.2054…

链接:http://poj.org/problem?id=1502 MPI Maelstrom Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 5249   Accepted: 3237 Description BIT has recently taken delivery of their new supercomputer, a 32 processor Apollo Odyssey distributed share…

本文来自:http://www.cppblog.com/snowshine09/archive/2011/08/02/152272.spx 多版本的POJ分类 流传最广的一种分类: 初期: 一.基本算法: (1)枚举. (poj1753,poj2965) (2)贪心(poj1328,poj2109,poj2586) (3)递归和分治法. (4)递推. (5)构造法.(poj3295) (6)模拟法.(poj1068,poj2632,poj1573,poj2993,poj2996) 二.图算法:…

MPI Maelstrom Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 4017   Accepted: 2412 Description BIT has recently taken delivery of their new supercomputer, a 32 processor Apollo Odyssey distributed shared memory machine with a hierarchic…

题目链接:http://poj.org/problem?id=1502 Description BIT has recently taken delivery of their processor Apollo Odyssey distributed shared memory machine with a hierarchical communication subsystem. Valentine McKee's research advisor, Jack Swigert, has ask…

acm之pku题目分类 对ACM有兴趣的同学们可以看看 DP:  1011   NTA                 简单题  1013   Great Equipment     简单题  1024   Calendar Game       简单题  1027   Human Gene Functions   简单题  1037   Gridland            简单题  1052   Algernon s Noxious Emissions 简单题  1409   Commun…

POJ 3342 Party at Hali-Bula / HDU 2412 Party at Hali-Bula / UVAlive 3794 Party at Hali-Bula / UVA 1220 Party at Hali-Bula(树型动态规划) Description Dear Contestant, I'm going to have a party at my villa at Hali-Bula to celebrate my retirement from BCM. I w…