测试数据是对的,可是不能AC,帮帮忙...
#include <iostream.h>
#include <algorithm>
#include <vector>
using std::vector;
using std::sort;
struct CPoint 
{
	int x;
	int y;
};
bool cmp1 ( CPoint t1, CPoint t2 )
{
   return t1.x < t2.x;
}
bool cmp2 ( CPoint t1, CPoint t2 )
{
   return t1.y < t2.y;
}
void computer(vector<CPoint>&cENum)
{
	bool F;
	int pos;
	int nMNum=0;
	while (1)
	{
		F=false;
		pos=-1;				
		for (int i=0;i<cENum.size();i++)
		{
			if (cENum[i].y!=-1)
			{
				pos=i;
				F=true;
				break;
			}
		}
		if (F==false)
		{
			break;
		}
		nMNum++;		
		for (int j=pos+1;j<cENum.size();j++)
		{
			if (cENum[j].y>=cENum[pos].y)
			{
				if (cENum[j].x>=cENum[pos].x)
				{
					cENum[pos].y=-1;
					pos=j;
				}
			}
		}
		cENum[pos].y=-1;
	}
	if (nMNum!=0)
	{
		printf("%d\n",nMNum);
	}
	
}
int main(int argc, char* argv[])
{
	int nNum;
	scanf("%d",&nNum);
	for (int i=0;i<nNum;i++)
	{
		int nENum;
		scanf("%d",&nENum);
		vector<CPoint>cENum;
		cENum.reserve(nENum);
		for (int j=0;j<nENum;j++)
		{
			CPoint temp;
			scanf("%d",&temp.x);
			scanf("%d",&temp.y);
			cENum.push_back(temp);
		}
		sort(cENum.begin(),cENum.end(),cmp1);
		sort(cENum.begin(),cENum.end(),cmp2);
		computer(cENum);		
	}
	return 0;
}