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View Compilation Error

0_0_18840990_31080\Main.java:5: 错误: 找不到符号
	public static void main(String[] args) throws IOException {
	                                              ^
  符号:   类 IOException
  位置: 类 Main
0_0_18840990_31080\Main.java:6: 错误: 找不到符号
		Scanner in = new Scanner (new BufferedInputStream(System.in));
		^
  符号:   类 Scanner
  位置: 类 Main
0_0_18840990_31080\Main.java:6: 错误: 找不到符号
		Scanner in = new Scanner (new BufferedInputStream(System.in));
		                 ^
  符号:   类 Scanner
  位置: 类 Main
0_0_18840990_31080\Main.java:6: 错误: 找不到符号
		Scanner in = new Scanner (new BufferedInputStream(System.in));
		                              ^
  符号:   类 BufferedInputStream
  位置: 类 Main
0_0_18840990_31080\Main.java:7: 错误: 找不到符号
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		^
  符号:   类 PrintWriter
  位置: 类 Main
0_0_18840990_31080\Main.java:7: 错误: 找不到符号
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		                      ^
  符号:   类 PrintWriter
  位置: 类 Main
0_0_18840990_31080\Main.java:7: 错误: 找不到符号
		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
		                                      ^
  符号:   类 OutputStreamWriter
  位置: 类 Main
7 个错误


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