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View Compilation Error

0_0_4751306_22381\Main.java:3: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger num = new BigInteger(String.valueOf(i)) ;
        ^
0_0_4751306_22381\Main.java:3: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger num = new BigInteger(String.valueOf(i)) ;
                             ^
0_0_4751306_22381\Main.java:4: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger one = new BigInteger("1") ;
        ^
0_0_4751306_22381\Main.java:4: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger one = new BigInteger("1") ;
                             ^
0_0_4751306_22381\Main.java:5: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger res = one ;
        ^
0_0_4751306_22381\Main.java:14: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner in = new Scanner(System.in) ;
        ^
0_0_4751306_22381\Main.java:14: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner in = new Scanner(System.in) ;
                         ^
7 错误


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