题目原网址:http://poj.org/problem?id=1177 题目中文翻译: 解题思路: 总体思路: 1.沿X轴离散化建树 2.按Y值从小到大排序平行与X轴的边,然后顺序处理 如果遇到矩形下面那条边则插入到线段树中,遇到矩形上面的边则将相应的边删除掉 根据线段树当前的状态统计长度 第二点是本题的核心思想,偶再举个例:   第一次求出的部分很好理解. 第二次求出的为什么会少了中间那部分.那是因为插入的新线段覆盖了第一条,此时线段树返回的长度是新的那一条的长度,将这个值再减去上次的就少了…

题目链接 题意:给出n个矩形,每个矩形给左下 和 右上的坐标,求围成的周长的长度. 分析: 首先感谢大神的博客,最近做题经常看大神的博客:http://www.cnblogs.com/kuangbin/ 沿x轴离散化.和之前的矩阵面积并有点像. 但是一定要去重,否则会错 #include <iostream> #include <cstdio> #include <vector> #include <cstring> #include <cstdlib…

题目链接 Description A number of rectangular posters, photographs and other pictures of the same shape are pasted on a wall. Their sides are all vertical or horizontal. Each rectangle can be partially or totally covered by the others. The length of the b…

#include<cstdio> #include<map> #include<algorithm> using namespace std; ; struct Node { double x,yl,yh; int w; bool operator<(Node t)const { return x<t.x; } }edge[N]; struct { int l,r,cover; }tr[N]; double ys[N]; void build(int u,i…

题意:给n个矩形,求矩形周长并 解法:跟求矩形面积并差不多,不过线段树节点记录的为: len: 此区间线段长度 cover: 此区间是否被整个覆盖 lmark,rmark: 此区间左右端点是否被覆盖 num: 此区间分离开的线段的条数 重点在转移的地方,不难理解. 代码: #include <iostream> #include <cmath> #include <iostream> #include <cstdio> #include <cstrin…

Atlantis Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 11551    Accepted Submission(s): 4906 Problem Description There are several ancient Greek texts that contain descriptions of the fabled…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1255 求矩形面积的交的线段树题目,刚做了求并的题目,再做这个刚觉良好啊,只要再加一个表示覆盖次数大于1次的长度变量即可 代码: #include<iostream> #include<cstdlib> #include<cstdio> #include<cstring> #include<algorithm> using namespace std;…

A number of rectangular posters, photographs and other pictures of the same shape are pasted on a wall. Their sides are all vertical or horizontal. Each rectangle can be partially or totally covered by the others. The length of the boundary of the un…

  描述 A number of rectangular posters, photographs and other pictures of the same shape are pasted on a wall. Their sides are all vertical or horizontal. Each rectangle can be partially or totally covered by the others. The length of the boundary of t…

Atlantis Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 9032    Accepted Submission(s): 3873 Problem Description There are several ancient Greek texts that contain descriptions of the fabled i…