题解 | #动态字符串#

动态字符串

http://www.nowcoder.com/practice/e2c51a6f126b41f9be403376c7adea15

import java.util.Scanner;

public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.next();

    //write your code here......
    StringBuilder sb = new StringBuilder(str);
    for(int i = sb.length() - 3;i > 0; i = i - 3){
        sb.insert(i,",");
    }
    System.out.print(sb);
}

}

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