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View Compilation Error

0_0_4798104_19942\Main.java:6: 找不到符号
符号: 类 IOException
位置: 类 Main
    public static void main(String[] args) throws IOException {
                                                  ^
0_0_4798104_19942\Main.java:7: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        ^
0_0_4798104_19942\Main.java:7: 找不到符号
符号: 类 BufferedReader
位置: 类 Main
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                                ^
0_0_4798104_19942\Main.java:7: 找不到符号
符号: 类 InputStreamReader
位置: 类 Main
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                                                   ^
0_0_4798104_19942\Main.java:10: 找不到符号
符号: 类 Scanner
位置: 类 Main
            Scanner scanner = new Scanner(str.trim());
            ^
0_0_4798104_19942\Main.java:10: 找不到符号
符号: 类 Scanner
位置: 类 Main
            Scanner scanner = new Scanner(str.trim());
                                  ^
0_0_4798104_19942\Main.java:11: 找不到符号
符号: 类 Set
位置: 类 Main
            Set<Integer> map = new TreeSet<Integer>();
            ^
0_0_4798104_19942\Main.java:11: 找不到符号
符号: 类 TreeSet
位置: 类 Main
            Set<Integer> map = new TreeSet<Integer>();
                                   ^
0_0_4798104_19942\Main.java:16: 找不到符号
符号: 类 Iterator
位置: 类 Main
            Iterator<Integer> it= map.iterator();//输出
            ^
9 错误


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