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View Compilation Error

0_0_5185518_30562\Main.java:1: 类 Problem1000 是公共的,应在名为 Problem1000.java 的文件中声明
public class Problem1000 {
       ^
0_0_5185518_30562\Main.java:4: 找不到符号
符号: 类 BufferedReader
位置: 类 Problem1000
		BufferedReader br = null;
		^
0_0_5185518_30562\Main.java:7: 找不到符号
符号: 类 BufferedReader
位置: 类 Problem1000
			br = new BufferedReader(new InputStreamReader(System.in));
			         ^
0_0_5185518_30562\Main.java:7: 找不到符号
符号: 类 InputStreamReader
位置: 类 Problem1000
			br = new BufferedReader(new InputStreamReader(System.in));
			                            ^
0_0_5185518_30562\Main.java:18: 找不到符号
符号: 类 IOException
位置: 类 Problem1000
		} catch (IOException e) {
		         ^
0_0_5185518_30562\Main.java:24: 找不到符号
符号: 类 IOException
位置: 类 Problem1000
				} catch (IOException e) {
				         ^
6 错误


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