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View Compilation Error

0_0_20403063_25265\Main.java:3: 错误: 找不到符号
        Scanner in = new Scanner(System.in);  
        ^
  符号:   类 Scanner
  位置: 类 Main
0_0_20403063_25265\Main.java:3: 错误: 找不到符号
        Scanner in = new Scanner(System.in);  
                         ^
  符号:   类 Scanner
  位置: 类 Main
0_0_20403063_25265\Main.java:7: 错误: 找不到符号
            BigInteger a = in.nextBigInteger();  
            ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_20403063_25265\Main.java:8: 错误: 找不到符号
            BigInteger b = in.nextBigInteger();  
            ^
  符号:   类 BigInteger
  位置: 类 Main
4 个错误


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