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View Compilation Error

0_0_16205372_23929\Main.java:7: 错误: 找不到符号
        Scanner in = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Main
0_0_16205372_23929\Main.java:7: 错误: 找不到符号
        Scanner in = new Scanner(System.in);
                         ^
  符号:   类 Scanner
  位置: 类 Main
0_0_16205372_23929\Main.java:14: 错误: 找不到符号
            BigInteger sa = new BigInteger(in.next());
            ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_16205372_23929\Main.java:14: 错误: 找不到符号
            BigInteger sa = new BigInteger(in.next());
                                ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_16205372_23929\Main.java:15: 错误: 找不到符号
            BigInteger sb = new BigInteger(in.next());
            ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_16205372_23929\Main.java:15: 错误: 找不到符号
            BigInteger sb = new BigInteger(in.next());
                                ^
  符号:   类 BigInteger
  位置: 类 Main
0_0_16205372_23929\Main.java:19: 错误: 找不到符号
			BigInteger sr = sa.add(sb);
			^
  符号:   类 BigInteger
  位置: 类 Main
7 个错误


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