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View Compilation Error

0_0_9870202_938\Main.java:3: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger a = BigInteger.valueOf(0),b = BigInteger.valueOf(0); 
        ^
0_0_9870202_938\Main.java:3: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
        BigInteger a = BigInteger.valueOf(0),b = BigInteger.valueOf(0); 
                       ^
0_0_9870202_938\Main.java:3: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
        BigInteger a = BigInteger.valueOf(0),b = BigInteger.valueOf(0); 
                                                 ^
0_0_9870202_938\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin = new Scanner(System.in); 
        ^
0_0_9870202_938\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin = new Scanner(System.in); 
                          ^
5 错误


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