听我给你WA一声！！

#include<iostream>
using namespace std;
int a,c=64;
int d[1000];
int main()
{
	cin>>a;
	for (int i = 1; i <= a; i++) 
	{
	    for (int j = 1; j<=i; j++) 
		{
	        if (c != 90) 
	        {
			    c++;
				d[i] = c;
				cout<<(char)d[i]; 
	        }
	        else 
			{
				cout<<'Z';
				c=(int)'A';
			}
	    }
	    cout<<endl;
	}
	
	return 0;
}