蓝桥网试题 java 基础练习 字母图形

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不知道说啥

感觉好像偏离主体思想了

但是这样写好简单

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算法

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        char[] ch = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N',
                'O','P','Q','R','S','T','U','V','W','X','Y','Z'};
        String st = "";
        for(int i=0;i<m;i++)
            st += ch[i];
        for(int i=0;i<n;i++){
            String st1,st2;
            if(i!=0){
                st1 = st.substring(0, st.length()-1);
                st2 = ch[i]+"";
                st = st2+st1;
            }
            System.out.println(st);
        }
    }
}