Nothing in Common

problem id:--https://www.codechef.com/problems/NOTINCOM

code:--

#include<iostream>
#include<unordered_set>
using namespace std;
int main()
{
int t;
cin>>t;
while(t--)
{
int n,m;
cin>>n>>m;
int num;
unordered_set<int> myset;
for(int i=1;i<=n;++i)
{
cin>>num;
myset.insert(num);
}
int count=0;
for(int i=1;i<=m;++i)
{
cin>>num;
if(myset.find(num)!=myset.end())
++count;
}
cout<<count<<'\n';
}
return 0;
}