这个题算是我的第一个扫描线的题,扫描线算是一种思想吧,用到线段树+离散化.感觉高大上. 主要参考了这位大神的博客. http://www.cnblogs.com/kuangbin/archive/2012/08/15/2640870.html HDU1542 Atlantis(线段树:扫描线) http://acm.hdu.edu.cn/showproblem.php?pid=1542 分析: 首先假设有下图两个矩阵,我们如果用扫描线的方法如何计算它们的总面积呢? 首先我们将矩形的上下边分为上位…

#pragma warning (disable:4996) #include<iostream> #include<cstring> #include<string> #include<cstdio> #include<algorithm> #include<vector> #include<cmath> #define maxn 150 using namespace std; int n; struct Segmen…

There are several ancient Greek texts that contain descriptions of the fabled island Atlantis. Some of these texts even include maps of parts of the island. But unfortunately, these maps describe different regions of Atlantis. Your friend Bill has to…

题意: 给定n个矩阵的左下角和右上角坐标,求矩阵面积并(矩阵总是正放的,即与x轴y轴都平行) 思路: 扫描线裸题 http://www.cnblogs.com/fenshen371/p/3214092.html 对于一个矩阵,我们仅仅关心他的上下底边.线段树维护的是当前有哪些区间是被线段覆盖的(即把线段都移动到x轴上,x轴被覆盖的长度是多少) 我们从上往下扫,则对于随意一条(如15,10)  我们会计算(20,13)-(15,10)之间的矩形面积 而对于(11,8),我们会计算(15,10)-(…

There are nnn rectangles on the plane. The problem is to find the area of the union of these rectangles. Note that these rectangles might overlap with each other, and the overlapped areas of these rectangles shall not be counted more than once. For e…

D. Vika and Segments     Vika has an infinite sheet of squared paper. Initially all squares are white. She introduced a two-dimensional coordinate system on this sheet and drew n black horizontal and vertical segments parallel to the coordinate axes.…

[题目] 覆盖的面积 Problem Description 给定平面上若干矩形,求出被这些矩形覆盖过至少两次的区域的面积. Input 输入数据的第一行是一个正整数T(1<=T<=100),代表测试数据的数量.每个测试数据的第一行是一个正整数N(1<=N<=1000),代表矩形的数量,然后是N行数据,每一行包含四个浮点数,代表平面上的一个矩形的左上角坐标和右下角坐标,矩形的上下边和X轴平行,左右边和Y轴平行.坐标的范围从0到100000.注意:本题的输入数据较多,推荐使用scan…

题意: 给你一幅图,问你第二大矩形面积是多少. 思路: 直接一行行跑stack求最大矩阵面积的经典算法,不断更新第二大矩形面积,注意第二大矩形可能在第一大矩形里面. #define IOS ios_base::sync_with_stdio(0); cin.tie(0); #include <cstdio>//sprintf islower isupper #include <cstdlib>//malloc exit strcat itoa system("cls&qu…

求矩阵的面积并 采用的是区间更新 #include <iostream> #include <stdio.h> #include <string.h> #include <algorithm> #define lson rt<<1,L,mid #define rson rt<<1|1,mid+1,R /* AC 一开始一直WA的原因是,hashx写成了int型!!! 第一次用的是直接单点更新,这次用区间更新写写看 */ using n…

There are several ancient Greek texts that contain descriptions of the fabled island Atlantis. Some of these texts even include maps of parts of the island. But unfortunately, these maps describe different regions of Atlantis. Your friend Bill has to…