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View Compilation Error

0_0_8306285_16968\Main.java:4: 找不到符号
符号: 类 LinkedList
位置: 类 Room
	LinkedList<Integer> nextRooms;
	^
0_0_8306285_16968\Main.java:39: 找不到符号
符号: 类 IOException
位置: 类 Main
	public static void main(String[] args) throws IOException {
	                                              ^
0_0_8306285_16968\Main.java:25: 找不到符号
符号: 类 Iterator
位置: 类 Main
		Iterator<Integer> iter = rooms[start].nextRooms.iterator();
		^
0_0_8306285_16968\Main.java:40: 找不到符号
符号: 类 StreamTokenizer
位置: 类 Main
		StreamTokenizer in = new StreamTokenizer(new BufferedReader(
		^
0_0_8306285_16968\Main.java:40: 找不到符号
符号: 类 StreamTokenizer
位置: 类 Main
		StreamTokenizer in = new StreamTokenizer(new BufferedReader(
		                         ^
0_0_8306285_16968\Main.java:40: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
		StreamTokenizer in = new StreamTokenizer(new BufferedReader(
		                                             ^
0_0_8306285_16968\Main.java:41: 找不到符号
符号: 类 InputStreamReader
位置: 类 Main
				new InputStreamReader(System.in)));
				    ^
0_0_8306285_16968\Main.java:42: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		^
0_0_8306285_16968\Main.java:42: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		                      ^
0_0_8306285_16968\Main.java:42: 找不到符号
符号: 类 OutputStreamWriter
位置: 类 Main
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		                                      ^
0_0_8306285_16968\Main.java:58: 找不到符号
符号: 类 LinkedList
位置: 类 Main
				rooms[i].nextRooms = new LinkedList<Integer>();
				                         ^
11 错误


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