为何以下代码是OLE?????

#include<bits/stdc++.h>
#define int long long
using namespace std;
__int128 read(){
    __int128 s = 0;
	bool t = false;
    char c = getchar();
    while(c < '0'||c > '9'){
        if(c == '-') t = true;
        c = getchar();
    }
    while(c >= '0'&&c <= '9'){
        s = s*10+c-'0';
        c = getchar();
    }
    if(t) return -s;
    return s;
}
signed main(){
	int n = read();
	for(char i = 'A';i <= 'A'-1+n;i++,cout<<'\n'){
		if(i > 'Z'){
			i = 'A';
		}
		for(char j = i;j <= i-1+n;j++){
			if(j > 'Z'){
				j = 'A';
			}
			cout<<j;
		}
	}
	return 0;
}