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View Compilation Error

0_0_1120477_318\Main.java:4: 类 AB 是公共的,应在名为 AB.java 的文件中声明
public class AB{
       ^
0_0_1120477_318\Main.java:6: 找不到符号
符号: 类 inputStream
位置: 类 AB
    BufferedReader stdIn =  new BufferedReader(new inputStream(System.in));
                                                   ^
0_0_1120477_318\Main.java:9: 找不到符号
符号: 变量 std
位置: 类 AB
          String input = std.readln();
                         ^
3 错误


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