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View Compilation Error

0_0_30518676_12630\Main.java:10: 错误: 找不到符号
        Scanner scanner = new Scanner(System.in);
        ^
  符号:   类 Scanner
  位置: 类 Main
0_0_30518676_12630\Main.java:10: 错误: 找不到符号
        Scanner scanner = new Scanner(System.in);
                              ^
  符号:   类 Scanner
  位置: 类 Main
0_0_30518676_12630\Main.java:44: 错误: 找不到符号
        Queue<Coordinates> queue=new ArrayDeque<>();
        ^
  符号:   类 Queue
  位置: 类 Main
0_0_30518676_12630\Main.java:44: 错误: 找不到符号
        Queue<Coordinates> queue=new ArrayDeque<>();
                                     ^
  符号:   类 ArrayDeque
  位置: 类 Main
4 个错误


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