779 kth symbol in grammar#47
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kitano-kazuki wants to merge 3 commits into
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Yuto729
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May 10, 2026
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| if n <= 0: | ||
| raise ValueError("n must be > 0") | ||
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| if k > 2 ** (n - 1): | ||
| raise ValueError("k must be less than the number of symbols in the row") |
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| is_reverse = False | ||
| row = n | ||
| col = k |
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rowに対してcolということだと思いますが、問題文にcolの定義が出てきているわけではないので、ここは単純にkの方がわかりやすい気がします
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引数で渡されるkと今回注目するもの（変動する値）を区別したかったんですよね.
colだと確かに問題の定義にないのでわかりにくそうというのは同意です
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| while row > 1: | ||
| if col % 2 == 0: | ||
| is_reverse = not is_reverse | ||
| row = row - 1 | ||
| col = (col + 1) // 2 | ||
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| if is_reverse: | ||
| return 1 | ||
| else: | ||
| return 0 |
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ループ内で累積した結果をそのまま返すというやり方もありそうです。少しトリッキーになりますね
result = 0
row = n
col = k
while row > 1:
if col % 2 == 0:
# 反転する
result = 1 - result
row = row - 1
col = (col + 1) // 2
return result
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LGTM |
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https://leetcode.com/problems/k-th-symbol-in-grammar/description/