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View Compilation Error

0_0_1241552_28772\Main.java:14: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                ^
0_0_1241552_28772\Main.java:14: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                                        ^
0_0_1241552_28772\Main.java:14: 找不到符号
符号: 类 InputStreamReader
位置: 类 Main
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                                                           ^
0_0_1241552_28772\Main.java:23: 找不到符号
符号: 类 IOException
位置: 类 Main
			catch(IOException e)
                              ^
4 错误


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