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View Compilation Error

0_0_35802569_1728\Main.java:3: 错误: 找不到符号
        Scanner scan = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 HDU2002
0_0_35802569_1728\Main.java:3: 错误: 找不到符号
        Scanner scan = new Scanner(System.in);
                           ^
  符号:   类 Scanner
  位置: 类 HDU2002
0_0_35802569_1728\Main.java:6: 错误: 找不到符号
        DecimalFormat num = new DecimalFormat("#.000");
        ^
  符号:   类 DecimalFormat
  位置: 类 HDU2002
0_0_35802569_1728\Main.java:6: 错误: 找不到符号
        DecimalFormat num = new DecimalFormat("#.000");
                                ^
  符号:   类 DecimalFormat
  位置: 类 HDU2002
4 个错误


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