題解 | 單組_字符串
單組_字符串
http://fangfengwang8.cn/practice/e3a57b2ff6de4aefb82af98925df544e
import java.util.Scanner; // 注意類名必須為 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); String s = in.next(); StringBuilder reverse = new StringBuilder(); for(int i = n - 1; i >= 0; i--){ reverse.append(s.charAt(i)); } System.out.println(reverse.toString()); } }