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View Compilation Error

0_0_12162020_26660\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Main
          Scanner reader = new Scanner(System.in);
          ^
0_0_12162020_26660\Main.java:4: 找不到符号
符号: 类 Scanner
位置: 类 Main
          Scanner reader = new Scanner(System.in);
                               ^
2 错误


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