没看到Java的题解自己写一篇

解题思路:

注意事项:

参考代码:

import java.util.Scanner;

public class C1688{

public static void main(String[] args){

Scanner input=new Scanner(System.in);

StringBuffer stra=new StringBuffer(input.next());

String strb=input.next();

int i=input.nextInt();

stra.insert(i-1,strb);

System.out.println(stra);

}

}