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View Compilation Error

0_0_12184717_22993\Main.java:4: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger mul;
        ^
0_0_12184717_22993\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin= new Scanner(System.in);
        ^
0_0_12184717_22993\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin= new Scanner(System.in);
                         ^
0_0_12184717_22993\Main.java:8: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            mul= BigInteger.ONE;
                 ^
0_0_12184717_22993\Main.java:10: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
                mul= mul.multiply(BigInteger.valueOf((long) i));
                                  ^
5 错误


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