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View Compilation Error

0_0_38477103_26513\Main.java:4: 错误: 找不到符号
        Scanner arr = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Main
0_0_38477103_26513\Main.java:4: 错误: 找不到符号
        Scanner arr = new Scanner(System.in);
                          ^
  符号:   类 Scanner
  位置: 类 Main
0_0_38477103_26513\Main.java:7: 错误: 找不到符号
            BigInteger a = arr.nextBigInteger();
            ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_38477103_26513\Main.java:8: 错误: 找不到符号
            BigInteger b = arr.nextBigInteger();
            ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_38477103_26513\Main.java:9: 错误: 找不到符号
            BigInteger sum = a.add(b);
            ^
  符号:   类 BigInteger
  位置: 类 Main
5 个错误


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