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View Compilation Error

1060792_0_0_31111\Main.java:16: 找不到符号
符号: 类 BigInteger
位置: 类 Main
            BigInteger a1=BigInteger.valueOf(1);
            ^
1060792_0_0_31111\Main.java:16: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            BigInteger a1=BigInteger.valueOf(1);
                          ^
1060792_0_0_31111\Main.java:17: 找不到符号
符号: 类 BigInteger
位置: 类 Main
            BigInteger a2=BigInteger.valueOf(1);
            ^
1060792_0_0_31111\Main.java:17: 找不到符号
符号: 变量 BigInteger
位置: 类 Main
            BigInteger a2=BigInteger.valueOf(1);
                          ^
1060792_0_0_31111\Main.java:18: 找不到符号
符号: 类 BigInteger
位置: 类 Main
            BigInteger a3;
            ^
5 错误


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