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View Compilation Error

0_0_39148926_4786\Main.java:18: 错误: 找不到符号
                    res.add(i);
                    ^
  符号:   变量 res
  位置: 类 Main
0_0_39148926_4786\Main.java:20: 错误: 找不到符号
            if (res.size() == 0) System.out.println("NULL");
                ^
  符号:   变量 res
  位置: 类 Main
0_0_39148926_4786\Main.java:22: 错误: 找不到符号
                Collections.sort(res);
                                 ^
  符号:   变量 res
  位置: 类 Main
0_0_39148926_4786\Main.java:23: 错误: 找不到符号
                for (int r : res) System.out.print(r + " ");
                             ^
  符号:   变量 res
  位置: 类 Main
4 个错误


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