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View Compilation Error

0_0_13021336_8360\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Main
		Scanner kb = new Scanner(System.in);
		^
0_0_13021336_8360\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Main
		Scanner kb = new Scanner(System.in);
		                 ^
0_0_13021336_8360\Main.java:6: 找不到符号
符号: 类 HashSet
位置: 类 Main
			HashSet<Integer> list =new HashSet<Integer>();
			^
0_0_13021336_8360\Main.java:6: 找不到符号
符号: 类 HashSet
位置: 类 Main
			HashSet<Integer> list =new HashSet<Integer>();
			                           ^
4 错误


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