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View Compilation Error

0_0_9524526_13949\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner in = new Scanner(System.in);
        ^
0_0_9524526_13949\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner in = new Scanner(System.in);
                         ^
0_0_9524526_13949\Main.java:7: 找不到符号
符号: 类 BigInteger
位置: 类 Main
            BigInteger num1 = in.nextBigInteger();
            ^
0_0_9524526_13949\Main.java:8: 找不到符号
符号: 类 BigInteger
位置: 类 Main
            BigInteger num2 = in.nextBigInteger();
            ^
4 错误


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