Description Ted has a new house with a huge window. In this big summer, Ted decides to decorate the window with some posters to prevent the glare outside. All things that Ted can find are rectangle posters. However, Ted is such a picky guy that in ev…

做这道题之前,建议先做POJ 1151  Atlantis,经典的扫描线求矩阵的面积并 参考连接: http://www.cnblogs.com/scau20110726/archive/2013/04/13/3018702.html 线段树辅助——扫描线法计算矩形周长并(轮廓线):http://www.cnblogs.com/scau20110726/archive/2013/04/13/3018687.htmlhttp://blog.csdn.net/ophunter/article/det…

题目链接 题意 给出n个矩形,求面积并. 思路 使用扫描线,我这里离散化y轴,按照x坐标从左往右扫过去.离散化后的y轴可以用线段树维护整个y上面的线段总长度,当碰到扫描线的时候,就可以统计面积.这里要注意线段树上结点维护的是线段的信息,而不是点的信息. 参考资料 #include <bits/stdc++.h> using namespace std; typedef long long LL; typedef pair<int, int> pii; const int INF =…

题目链接:http://poj.org/problem?id=1151 题意是平面上给你n个矩形,让你求矩形的面积并. 首先学一下什么是扫描线:http://www.cnblogs.com/scau20110726/archive/2013/04/12/3016765.html 这是别人的blog,写的挺好的.然后明白扫描线之后呢,接下来就很简单了,只需要一次一次求面积然后累加就好了.这题离散化之后,数据的范围更小了(因为n只有100),单点更新就行了. #include <iostream>…

题目链接 题意 给出n个矩形,求周长并. 思路 学了区间并,比较容易想到周长并. 我是对x方向和y方向分别做两次扫描线.应该记录一个pre变量,记录上一次扫描的时候的长度,对于每次遇到扫描线统计答案的时候,使用当前的 tree[1] 去与 pre 做相减,因为这一次如果边长增加了或者减少了,那么一定和之前的值有差值,其中的差值就是这次的变化量. 但是这份代码交G++会WA,C++就A了.而且排序的时候如果权值相同,应该让状态为1(开始)的扫描线排在状态为-1(结束)的扫描线前面,因为重合的话,那…

#include<iostream> #include<vector> #include<cmath> #include<algorithm> using namespace std; #define y1 y11 #define ls rt<<1,l,m #define rs rt<<1|1,m+1,r ; double x1[maxn]; double y1[maxn]; double x2[maxn]; double y2[ma…

Description Facer is addicted to a game called "Tidy is learning to swim". But he finds it too easy. So he develops a new game called "Facer is learning to swim" which is more difficult and more interesting. In the new game, a robot na…

Description The city of M is a famous shopping city and its open-air shopping malls are extremely attractive. During the tourist seasons, thousands of people crowded into these shopping malls and enjoy the vary-different shopping. Unfortunately, the…

Description Students often have problems taking up seats. When two students want the same seat, a quarrel will probably begin. It will have very bad effect when such subjects occur on the BBS.  So, we urgently need a seat-taking-up rule. After severa…

Description On the evening of 3 August 1492, Christopher Columbus departed from Palos de la Frontera with a few ships, starting a serious of voyages of finding a new route to India. As you know, just in those voyages, Columbus discovered the America…