OJ-Problems-Source/HDOJ/3265_autoAC.cpp

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#include<iostream>
#include<vector>
#include<string.h>
#include <algorithm>
using namespace std;
const int maxx=55555;
struct node
{
__int64 sum,color;
}tree[maxx<<3];
struct seg
{
int x1,x2,y,color;
seg(int a,int b,int c,int d):x1(a),x2(b),y(c),color(d){}
bool operator < (const seg &t)const{
return y < t.y;
}
};
void pushUp(int no,int l,int r)
{
if(tree[no].color) tree[no].sum=r-l+1;
else if(l==r) tree[no].sum=0;
else tree[no].sum=tree[no<<1].sum+tree[no<<1|1].sum;
}
void update(int x1,int x2,int color,int l,int r,int no)
{
if(x1<=l&&r<=x2)
{
tree[no].color+=color;
pushUp(no,l,r);
return;
}
int m=(l+r)>>1;
if(x1<=m) update(x1,x2,color,l,m,no<<1);
if(x2>m) update(x1,x2,color,m+1,r,no<<1|1);
pushUp(no,l,r);
}
int main()
{
int n,x1,x2,x3,x4,y1,y2,y3,y4,i;
while(cin>>n,n)
{
vector<seg> v;
for(i=1;i<=n;++i)
{
cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4;
if(x1<x3)
{
v.push_back(seg(x1,x3,y1,1));
v.push_back(seg(x1,x3,y2,-1));
}
if(x4<x2)
{
v.push_back(seg(x4,x2,y1,1));
v.push_back(seg(x4,x2,y2,-1));
}
if(y1<y3)
{
v.push_back(seg(x3,x4,y1,1));
v.push_back(seg(x3,x4,y3,-1));
}
if(y4<y2)
{
v.push_back(seg(x3,x4,y4,1));
v.push_back(seg(x3,x4,y2,-1));
}
}
sort(v.begin(),v.end());
memset(tree,0,sizeof(tree));
__int64 ret=0;
int end=v.size();
for(i=0;i<end-1;++i)
{
if(v[i].x2>v[i].x1)
update(v[i].x1,v[i].x2-1,v[i].color,0,maxx,1);
ret+=tree[1].sum*(v[i+1].y-v[i].y);
}
printf("%I64d\n",ret);
}
return 0;
}