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View Compilation Error

0_0_24931967_27310\Main.java:7: 错误: 找不到符号
	   Scanner  scan=new Scanner(System.in);
	   ^
  符号:   类 Scanner
  位置: 类 Main
0_0_24931967_27310\Main.java:7: 错误: 找不到符号
	   Scanner  scan=new Scanner(System.in);
	                     ^
  符号:   类 Scanner
  位置: 类 Main
0_0_24931967_27310\Main.java:13: 错误: 找不到符号
		   BigInteger  a=scan.nextBigInteger();
		   ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_24931967_27310\Main.java:14: 错误: 找不到符号
		   BigInteger  b=scan.nextBigInteger();
		   ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_24931967_27310\Main.java:15: 错误: 找不到符号
		   BigInteger  c=a.add(b);
		   ^
  符号:   类 BigInteger
  位置: 类 Main
5 个错误


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