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View Compilation Error

0_0_24983012_9589\Main.java:4: 错误: 找不到符号
		Scanner sc = new Scanner(System.in);
		^
  符号:   类 Scanner
  位置: 类 Main
0_0_24983012_9589\Main.java:4: 错误: 找不到符号
		Scanner sc = new Scanner(System.in);
		                 ^
  符号:   类 Scanner
  位置: 类 Main
0_0_24983012_9589\Main.java:35: 错误: 找不到符号
		List<Integer> subList = new ArrayList<>();
		^
  符号:   类 List
  位置: 类 Main
0_0_24983012_9589\Main.java:35: 错误: 找不到符号
		List<Integer> subList = new ArrayList<>();
		                            ^
  符号:   类 ArrayList
  位置: 类 Main
4 个错误


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