ZOJ - 4025 King of Karaoke

https://vjudge.net/problem/ZOJ-4025

#include<iostream>
#include<map>
using namespace std;
const int N=1e5+10;
int h[N];
int main()
{
	int m,n;
	cin>>m;
	while(m--)
	{
		map<int,int> q;
		cin>>n;
		for(int i=0;i<n;i++)
			scanf("%d",&h[i]);
		int t;
		for(int i=0;i<n;i++)
		{
			scanf("%d",&t);
			q[t-h[i]]++;
		}
		int ma=0,ans;
		for(auto i:q)
		{
			if(i.second>ma)
				ma=i.second;
		}
		cout<<ma<<"\n";
	}
	return 0;
}