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View Compilation Error

0_0_24182118_25628\Main.java:7: 错误: 找不到符号
    	Scanner sc=new Scanner(System.in);
    	^
  符号:   类 Scanner
  位置: 类 Main
0_0_24182118_25628\Main.java:7: 错误: 找不到符号
    	Scanner sc=new Scanner(System.in);
    	               ^
  符号:   类 Scanner
  位置: 类 Main
0_0_24182118_25628\Main.java:13: 错误: 无法从静态上下文中引用非静态 变量 this
			v[i]=new Vertex(i+1, -1, -1);
			     ^
3 个错误


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