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View Compilation Error

0_0_23377060_22171\Main.java:39: 错误: 找不到符号
            String ln = in.readLine();
                        ^
  符号:   变量 in
  位置: 类 Main
0_0_23377060_22171\Main.java:68: 错误: 找不到符号
        out.println(k);
        ^
  符号:   变量 out
  位置: 类 Main
0_0_23377060_22171\Main.java:70: 错误: 找不到符号
            out.println(i + 1);
            ^
  符号:   变量 out
  位置: 类 Main
0_0_23377060_22171\Main.java:72: 错误: 找不到符号
        out.close();
        ^
  符号:   变量 out
  位置: 类 Main
4 个错误


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