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View Compilation Error

0_0_35192342_26044\Main.java:5: 错误: 找不到符号
  Scanner sin = new Scanner(new BufferedInputStream(System.in));
  ^
  符号:   类 Scanner
  位置: 类 Main
0_0_35192342_26044\Main.java:5: 错误: 找不到符号
  Scanner sin = new Scanner(new BufferedInputStream(System.in));
                    ^
  符号:   类 Scanner
  位置: 类 Main
0_0_35192342_26044\Main.java:5: 错误: 找不到符号
  Scanner sin = new Scanner(new BufferedInputStream(System.in));
                                ^
  符号:   类 BufferedInputStream
  位置: 类 Main
0_0_35192342_26044\Main.java:10: 错误: 找不到符号
   DecimalFormat df = new DecimalFormat("0.00");
   ^
  符号:   类 DecimalFormat
  位置: 类 Main
0_0_35192342_26044\Main.java:10: 错误: 找不到符号
   DecimalFormat df = new DecimalFormat("0.00");
                          ^
  符号:   类 DecimalFormat
  位置: 类 Main
5 个错误


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