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Mar 14, 2026
| - 計算量はO(nl) | ||
| - 入力がアルファベット小文字以外のときには例外処理で対応 | ||
| - 実行時間はsol1の方が速い | ||
| - pythonのsortedが高速でloglが定数倍より速い？ |
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Native code の部分だというだけで感覚10-20倍程度速いです。
下につけたのは適当に拾ってきたソートの速度の比較ですが、ネイティブコードにすると10-20倍くらいは簡単に変わるんですね。
C 言語と Python は50-100倍くらい違い、ただしネイティブコードでもガーベージコレクションなど Python Object の操作をしないといけないので、C 言語並までにはならないだろうくらいの推測です。
https://discord.com/channels/1084280443945353267/1367399154200088626/1372840818397810701
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なるほど、そう考えると色々な組み込み関数は知っておくと良さそうです。（基数ソートをRadix sortというの知らなかったです。これが一番速いんですね）
| def groupAnagrams(self, strs: List[str]) -> List[List[str]]: | ||
| anagram_sets = defaultdict(list) | ||
| for orig_str in strs: | ||
| sorted_str = sorted(orig_str) |
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私は "".join まで上の行でしてしまうかもしれません。まあ、どちらでもいいです。
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sorted_key = "".join(sorted(orig_str))
anagram_sets[sorted_key].append(orig_str)この方が見やすいですね
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https://leetcode.com/problems/group-anagrams/