253. Meeting Rooms II #26
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oda
reviewed
Sep 28, 2025
| class Solution: | ||
| def minMeetingRooms(self, intervals: List[Interval]) -> int: | ||
| intervals.sort(key=lambda x: x.start) | ||
| rooms = [] |
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個人的には、「各部屋の最終使用時刻(鍵返却時刻)」なので、rooms でないほうが読みやすいように思います。
| ## Step1 | ||
| - 252.と同様の考え方で、前の会議終了時刻＞次の会議開始時刻となった場合に会議日数をインクリメントしていく方針とした | ||
| - しかし、すべての会議を調べるわけではないので誤って会議日数をカウントしてしまう | ||
| - 最大の会議日数＝会議数となるため、すべての会議を調べていき会議時刻が重複しなかったら最大の会議日数からデクリメントする方針とした |
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これは、その後で使う会議室 X を決めてくっつけるみたいな考え方ですが、その会議室 X に何度もくっつけてしまうことがあるのでうまくいきませんね。
potrue
reviewed
Sep 29, 2025
| heapq.heappop(rooms) | ||
| heapq.heappush(rooms, interval.end) | ||
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| return len(rooms) |
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自分がこの別解のやり方を見たことがなかったのもあると思うのですが、少し理解に時間がかかりました。個人的にはカウントをインクリメント/デクリメントさせていくやり方の方がわかりやすかったです。
tokuhirat
reviewed
Sep 30, 2025
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| class Solution: | ||
| def minMeetingRooms(self, intervals: List[Interval]) -> int: | ||
| intervals.sort(key=lambda x: x.start) |
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253. Meeting Rooms II
次回予告: 22. Generate Parentheses