- public static void main(String[] args) {
- String s = "abcdef";
- StringBuilder sb = new StringBuilder();
- f(s,sb);
- System.out.println(sb.toString());
- }
- public static void f(String s,StringBuilder sb){
- if(s.length()>0){
- sb.append(s.substring(s.length()-1));
- f(s.substring(0, s.length()-1),sb);
- }
- }
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