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View Compilation Error

0_0_8260981_9143\Main.java:48: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		^
0_0_8260981_9143\Main.java:48: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		                        ^
0_0_8260981_9143\Main.java:48: 找不到符号
符号: 类 InputStreamReader
位置: 类 Main
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		                                           ^
0_0_8260981_9143\Main.java:69: 找不到符号
符号: 类 IOException
位置: 类 Main
			catch (IOException e)
			       ^
4 错误


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