解题报告

题意：

求矩形周长和。

思路：

左扫上扫，扫过了。

#include 
  
   
#include 
   
     #include 
    
      #include 
     
       #include 
      
        using namespace std; struct Seg { int lx,rx,ly,ry,h,v; friend bool operator < (Seg a,Seg b) { return a.h
       
        r||qr
        
         >1; update1(rt<<1,l,mid,ql,qr,v); update1(rt<<1|1,mid+1,r,ql,qr,v); push_up1(rt,l,r); } void push_up2(int rt,int l,int r) { if(lz[rt]) { sum[rt]=_hy[r+1]-_hy[l]; } else sum[rt]=sum[rt<<1]+sum[rt<<1|1]; } void update2(int rt,int l,int r,int ql,int qr,int v) { if(ql>r||qr
         
          >1; update2(rt<<1,l,mid,ql,qr,v); update2(rt<<1|1,mid+1,r,ql,qr,v); push_up2(rt,l,r); } int main() { int lx,rx,ly,ry,n,i,j; scanf("%d",&n); for(i=0; i
          
           
 
           
 Picture 
           
 
            
 
             
 
              
Time Limit: 2000MS
 
              
 
 
              
Memory Limit: 10000K
 
             
 
             
 
              
Total Submissions: 10332
 
              
 
 
              
Accepted: 5485
 
             
 
            
 
           
 
           
 
           
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 boundary of the union of all rectangles is called the perimeter. 
           
 
           
 Write a program to calculate the perimeter. An example with 7 rectangles is shown in Figure 1. 
           
 
           
            
            
           
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 The vertices of all rectangles have integer coordinates. 
           
 
           
Input
 Your program is to read from standard input. The first line contains the number of rectangles pasted on the wall. In each of the subsequent lines, one can find the integer coordinates of the lower left vertex and the upper right vertex of each rectangle. The values of those coordinates are given as ordered pairs consisting of an x-coordinate followed by a y-coordinate. 
           
 
           
 0 <= number of rectangles < 5000 
           
 All coordinates are in the range [-10000,10000] and any existing rectangle has a positive area. 
           
Output
 Your program is to write to standard output. The output must contain a single line with a non-negative integer which corresponds to the perimeter for the input rectangles. 
           
Sample Input
 
           
7
-15 0 5 10
-5 8 20 25
15 -4 24 14
0 -6 16 4
2 15 10 22
30 10 36 20
34 0 40 16
 
           
Sample Output
 
           
228
 
           
Source
 IOI 1998