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View Compilation Error

0_0_1503558_19929\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin=new Scanner(System.in);
        ^
0_0_1503558_19929\Main.java:5: 找不到符号
符号: 类 Scanner
位置: 类 Main
        Scanner cin=new Scanner(System.in);
                        ^
0_0_1503558_19929\Main.java:13: 不可转换的类型
找到: <nulltype>
需要: int
                sum+=cin.nextInt();
                                ^
3 错误


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