https://www.luogu.com.cn/discuss/857915?page=2 代码现在是这样

#include<bits/stdc++.h>
using namespace std;
int n,a;
char ch;
int main()
{
	srand(time(NULL));
	n=rand();
	cout<<n<<endl;
	for(int i=1;i<=n;i++)
	{	
		a=rand();
		cout<<a<<endl;
		for(int j=1;j<=a;j++)
		{
			ch='a'+rand()%26;
			cout<<ch;
		}
		cout<<" ";
		if(rand()%2!=0)
			cout<<'Z'<<endl;
		else
			cout<<'J'<<endl;
	}	
	return 0;
}

怎么控制范围 现在太大了