560. Subarray Sum Equals K #15
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potrue
reviewed
May 22, 2025
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| for num in nums: | ||
| cumsum += num | ||
| if cumsum - k in cumsum_to_count: |
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defaultdictを使うのであればこの条件分岐はなくてもいいかもしれません。
(defaultdictは評価された時点で辞書の中に値が入るので、条件分岐をしておくと無駄に辞書の中身が増えないという利点はありますが)
nktr-cp
reviewed
May 22, 2025
| num_subarrays = 0 | ||
| cumsum = 0 | ||
| cumsum_to_count = defaultdict(int) | ||
| cumsum_to_count[0] = 1 |
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多分好みの問題なのですが，自分はここはcumsum_to_count[cumsum] = 1が嬉しいです
| complement = k - nums[i] | ||
| if complement == 0: | ||
| num_subarrays += 1 | ||
| for j in range(i+1, len(nums)): |
tokuhirat
reviewed
May 22, 2025
| cumsum_to_count[cumsum] += 1 | ||
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| return num_subarrays | ||
| ``` |
oda
reviewed
May 23, 2025
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| - https://github.com/potrue/leetcode/pull/16/files?short_path=9af6c29#diff-9af6c29cdcdd4f79ab8b011317151f6cd8b13f570a036eb4d7473388bc3f0d56 | ||
| - chainを使って解いているがchainについて初めて見たので[ドキュメント]()https://docs.python.org/ja/3.13/library/itertools.html#itertools.chainを見る | ||
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ドキュメントを読むのはいい癖だと思います。
それから読む先ですが完走者の中で気に入った人を見繕っておいてもいいかと思います。
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