【基础练习习题】FJ的字符串。
package cWeb.buleCup; import java.util.Scanner; public class C1461 { public static StringBuffer getStr(int i) { if(i==1) return new StringBuffer("A"); else return getStr(i-1).append((char)(i-1+'A')).append(getStr(i-1)); } public static void main(String[] args) { Scanner in = new Scanner(System.in); int N = in.nextInt();//A-65 System.out.println(getStr(N).toString()); } }