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View Compilation Error

0_0_27473781_20414\Main.java:1: 错误: 类main是公共的, 应在名为 main.java 的文件中声明
public class main {
       ^
0_0_27473781_20414\Main.java:3: 错误: 找不到符号
	       Scanner a=new Scanner(System.in);
	       ^
  符号:   类 Scanner
  位置: 类 main
0_0_27473781_20414\Main.java:3: 错误: 找不到符号
	       Scanner a=new Scanner(System.in);
	                     ^
  符号:   类 Scanner
  位置: 类 main
0_0_27473781_20414\Main.java:5: 错误: 找不到符号
	       BigInteger A=a.nextBigInteger();
	       ^
  符号:   类 BigInteger
  位置: 类 main
0_0_27473781_20414\Main.java:6: 错误: 找不到符号
	       BigInteger B=new BigInteger("9");
	       ^
  符号:   类 BigInteger
  位置: 类 main
0_0_27473781_20414\Main.java:6: 错误: 找不到符号
	       BigInteger B=new BigInteger("9");
	                        ^
  符号:   类 BigInteger
  位置: 类 main
6 个错误


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