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View Compilation Error

0_0_11089455_30041\Main.java:3: 找不到符号
符号: 类 BigInteger
位置: 类 Main
    static BigInteger s[] = new BigInteger[102];
           ^
0_0_11089455_30041\Main.java:3: 找不到符号
符号: 类 BigInteger
位置: 类 Main
    static BigInteger s[] = new BigInteger[102];
                                ^
0_0_11089455_30041\Main.java:6: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
        s[0]=BigInteger.ONE;
             ^
0_0_11089455_30041\Main.java:8: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            s[i]=s[i-1].multiply(BigInteger.valueOf(2*(2*i-1)));
                                 ^
0_0_11089455_30041\Main.java:9: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            s[i] = s[i].divide(BigInteger.valueOf(i+1));
                               ^
0_0_11089455_30041\Main.java:15: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner input = new Scanner(System.in);
        ^
0_0_11089455_30041\Main.java:15: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner input = new Scanner(System.in);
                            ^
7 错误


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