Create Longest Substring Without Repeating Characters.md#47
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oda
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May 17, 2025
| return max_length | ||
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| +1が複数あるのでイメージしながら書かないとミスりますね |
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一つは、start が閉区間になっているというのもあるので、start - 1 を新しい start と置くと、すっきりするかもしれません。
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開区間で書いたら見やすくなりました。
class Solution:
def lengthOfLongestSubstring(self, s: str) -> int:
start = -1
char_to_last_index = {}
max_length = 0
for i, c in enumerate(s):
start = max(start, char_to_last_index.get(c, -1))
max_length = max(max_length, i - start)
char_to_last_index[c] = i
return max_length
hroc135
reviewed
May 17, 2025
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| 実行時間は5/10**4 / 10**6 = 5msくらい | ||
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| そういえばLeetcodeのLTEってどれくらいなんだろう |
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https://leetcode.com/problems/longest-substring-without-repeating-characters/description/