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View Compilation Error

0_0_39066515_30870\Main.java:36: 错误: 找不到符号
    private static int findMinimumRooms(Lecture1[] lectures) {
                                        ^
  符号:   类 Lecture1
  位置: 类 Main
0_0_39066515_30870\Main.java:37: 错误: 找不到符号
        Arrays.sort(lectures, Comparator.comparingInt(l -> l.start));
                                                            ^
  符号:   变量 start
  位置: 类型为Object的变量 l
0_0_39066515_30870\Main.java:42: 错误: 找不到符号
        for (Lecture1 lecture : lectures) {
             ^
  符号:   类 Lecture1
  位置: 类 Main
3 个错误


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