Create 779. K-th Symbol in Grammar.md#46
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oda
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May 15, 2025
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| https://github.com/hroc135/leetcode/pull/44/files | ||
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| - bitの内部実装を読んでいる。 |
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ビットを数えるのは CPU によっては専用の命令が用意されていたりするので、それの一番下のビットを見るだけの場合もありますね。
hroc135
reviewed
May 17, 2025
| def kthGrammar(self, n: int, k: int) -> int: | ||
| if n == 1: | ||
| return 0 | ||
| return self.kthGrammar(n - 1, (k + 1) // 2) ^ ((k & 1) ^ 1) |
hroc135
reviewed
May 17, 2025
| def kthGrammar(self, n: int, k: int) -> int: | ||
| result = 0 | ||
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| while n > 1: |
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while k > 1: で良さそうです。bit_count を使った解法で n に対して何もしないのと一緒で、k <= 2**(n-1) さえ分かっていればあとは k に対してのみ処理すればよいです。
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https://leetcode.com/problems/k-th-symbol-in-grammar/description/