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View Compilation Error

0_0_10442899_11834\Main.java:3: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin = new Scanner(new BufferedInputStream(System.in));
        ^
0_0_10442899_11834\Main.java:3: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin = new Scanner(new BufferedInputStream(System.in));
                          ^
0_0_10442899_11834\Main.java:3: 找不到符号
符号: 类 BufferedInputStream
位置: 类 Main
        Scanner cin = new Scanner(new BufferedInputStream(System.in));
                                      ^
0_0_10442899_11834\Main.java:5: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger tmp, ans = BigInteger.ZERO;
        ^
0_0_10442899_11834\Main.java:5: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
        BigInteger tmp, ans = BigInteger.ZERO;
                              ^
0_0_10442899_11834\Main.java:7: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            ans = BigInteger.ZERO;
                  ^
0_0_10442899_11834\Main.java:10: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
                if(tmp.compareTo(BigInteger.ZERO) == 0) {
                                 ^
7 错误


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