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View Compilation Error

0_0_8096075_21370\Main.java:2: 找不到符号
符号: 类 Scanner
位置: 类 Add
    static Scanner cin = new Scanner(System.in);
           ^
0_0_8096075_21370\Main.java:3: 找不到符号
符号: 类 IOException
位置: 类 Add
    public void solve()throws IOException{
                              ^
0_0_8096075_21370\Main.java:15: 找不到符号
符号: 类 Scanner
位置: 类 Main
    static Scanner cin = new Scanner(System.in);
           ^
0_0_8096075_21370\Main.java:16: 找不到符号
符号: 类 IOException
位置: 类 Main
    static public void main(String args[])throws IOException{
                                                 ^
0_0_8096075_21370\Main.java:2: 找不到符号
符号: 类 Scanner
位置: 类 Add
    static Scanner cin = new Scanner(System.in);
                             ^
0_0_8096075_21370\Main.java:15: 找不到符号
符号: 类 Scanner
位置: 类 Main
    static Scanner cin = new Scanner(System.in);
                             ^
6 错误


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