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View Compilation Error

0_0_5247971_24114\Main.java:4: 找不到符号
符号: 类 IOException
位置: 类 Main
    public static void main(String[] args) throws IOException{
                                                  ^
0_0_5247971_24114\Main.java:5: 找不到符号
符号: 类 StreamTokenizer
位置: 类 Main
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
        ^
0_0_5247971_24114\Main.java:5: 找不到符号
符号: 类 StreamTokenizer
位置: 类 Main
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                 ^
0_0_5247971_24114\Main.java:5: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                     ^
0_0_5247971_24114\Main.java:5: 找不到符号
符号: 类 InputStreamReader
位置: 类 Main
        StreamTokenizer st = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
                                                                        ^
0_0_5247971_24114\Main.java:6: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));        
        ^
0_0_5247971_24114\Main.java:6: 找不到符号
符号: 类 PrintWriter
位置: 类 Main
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));        
                             ^
0_0_5247971_24114\Main.java:6: 找不到符号
符号: 类 OutputStreamWriter
位置: 类 Main
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));        
                                             ^
0_0_5247971_24114\Main.java:7: 找不到符号
符号: 变量 StreamTokenizer
位置: 类 Main
        while(st.nextToken()!=StreamTokenizer.TT_EOF){
                              ^
0_0_5247971_24114\Main.java:21: 不可转换的类型
找到: <nulltype>
需要: double
                    st_sum += st.nval;
                                ^
0_0_5247971_24114\Main.java:22: 不可转换的类型
找到: <nulltype>
需要: double
                    cs_score[count%m] += st.nval;
                                           ^
11 错误


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