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View Compilation Error

0_0_12896900_30452\Main.java:6: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger[] a = new BigInteger[101];  
        ^
0_0_12896900_30452\Main.java:6: 找不到符号
符号: 类 BigInteger
位置: 类 Main
        BigInteger[] a = new BigInteger[101];  
                             ^
0_0_12896900_30452\Main.java:7: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
        a[0] = BigInteger.ZERO;  
               ^
0_0_12896900_30452\Main.java:8: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
        a[1] = BigInteger.valueOf(1);  
               ^
0_0_12896900_30452\Main.java:10: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            a[i] = a[i - 1].multiply(BigInteger.valueOf(4 * i - 2)).divide(BigInteger.valueOf(i+1));  
                                                                           ^
0_0_12896900_30452\Main.java:10: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            a[i] = a[i - 1].multiply(BigInteger.valueOf(4 * i - 2)).divide(BigInteger.valueOf(i+1));  
                                     ^
0_0_12896900_30452\Main.java:11: 找不到符号
符号: 类 Scanner
位置: 类 Main
            Scanner in = new Scanner(System.in);  
            ^
0_0_12896900_30452\Main.java:11: 找不到符号
符号: 类 Scanner
位置: 类 Main
            Scanner in = new Scanner(System.in);  
                             ^
8 错误


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