OJ-Problems-Source/HDOJ/4268_autoAC.cpp

52 lines
1.1 KiB
C++
Raw Normal View History

#include<iostream>
#include<set>
#include<algorithm>
#include<cstdio>
#include<cstring>
using namespace std;
multiset<int> myset;
multiset<int>::iterator it;
const int maxn=200000;
struct node
{
int x,y;
bool operator<(const node& b)const
{
return x<b.x;
}
}a[maxn],b[maxn];
int main()
{
int sec,n;
scanf("%d",&sec);
for(int z=1;z<=sec;z++)
{
myset.clear();
scanf("%d",&n);
for(int i=1;i<=n;i++)
scanf("%d%d",&a[i].x,&a[i].y);
for(int i=1;i<=n;i++)
scanf("%d%d",&b[i].x,&b[i].y);
sort(a+1,a+1+n);
sort(b+1,b+1+n);
int j=1;int ans=0;
for(int i=1;i<=n;i++)
{
while(j<=n&&b[j].x<=a[i].x)
{
myset.insert(b[j].y);
j++;
}
it=myset.upper_bound(a[i].y);
if(myset.size()>0&&it!=myset.begin())it--;
if(myset.size()>0&&(*it)<=a[i].y)
{
ans++;
myset.erase(it);
}
}
printf("%d\n",ans);
}
return 0;
}