#include<stdio.h>
int main()
{
int t,n,j,pie[101],rack[101],small_pie,small_rack,count=0,i,index1,index2;
scanf("%d",&t);
for(j=0;j<t;i++)
{
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d",&pie[i]);
}
for(i=0;i<n;i++)
{
scanf("%d",&rack[i]);
}
for(j=0;j<n;j++)
{
for(i=0;i<n;i++)
{
small_pie=2000;
small_rack=2000;
if(small_pie>pie[i])
{
small_pie=pie[i];
index1=i;
}
if(small_rack>rack[i])
{
small_rack=rack[i];
index2=i;
}
}
if(small_pie<=small_rack)
{
count++;
pie[index1]=’\0’;
rack[index2]=’\0’;
}
else
{
rack[index2]=’\0’;
}
}
printf("%d\n",count);
}
return 0;
}