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View Compilation Error

0_0_33359649_18783\Main.java:8: 错误: 找不到符号
		Scanner cin=new Scanner(System.in);
		^
  符号:   类 Scanner
  位置: 类 Main
0_0_33359649_18783\Main.java:8: 错误: 找不到符号
		Scanner cin=new Scanner(System.in);
		                ^
  符号:   类 Scanner
  位置: 类 Main
0_0_33359649_18783\Main.java:12: 错误: 找不到符号
			BigInteger ans=new BigInteger("2");
			^
  符号:   类 BigInteger
  位置: 类 Main
0_0_33359649_18783\Main.java:12: 错误: 找不到符号
			BigInteger ans=new BigInteger("2");
			                   ^
  符号:   类 BigInteger
  位置: 类 Main
4 个错误


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