22. Generate Parentheses #47
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tokuhirat
reviewed
Oct 7, 2025
| # @return {String[]} | ||
| def generate_parenthesis(n) | ||
| result = [] | ||
| generate_parenthesis_helper = lambda do |left, right, parenthesis| |
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個人的には num_left のように個数であることがわかるように書きたいなと思いました。
nodchip
reviewed
Oct 8, 2025
| # @return {String[]} | ||
| def generate_parenthesis(n) | ||
| combinations = [] | ||
| generate_parenthesis_helper = lambda do |parenthesis, left ,right| |
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コメントありがとうございます。
parenthesisは引数に渡さずに再帰関数の外側に置くということですかね。
これは、parenthesisに破壊的変更を加えていて予想しにくいので、関数の引数として渡さない方が良いという考えのもとでしょうか？
# @param {Integer} n
# @return {String[]}
def generate_parenthesis(n)
combinations = []
parenthesis = []
generate_parenthesis_helper = lambda do |left ,right|
if right == n
combinations << parenthesis.join
return
end
if left < n
parenthesis << "("
generate_parenthesis_helper.call(left + 1, right)
parenthesis.pop
end
if right < left
parenthesis << ")"
generate_parenthesis_helper.call(left, right + 1)
parenthesis.pop
end
end
generate_parenthesis_helper.call(0, 0)
combinations
end
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ああ、そういうことでしたか、ありがとうございます。
potrue
reviewed
Oct 10, 2025
| end | ||
| end | ||
| generate_parenthesis_helper.call(0, 0, []) | ||
| result |
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読みやすいです。自分もleft, rightはindexのイメージがあるのでnum_left, num_rightの方がいいかもしれないです。num_open, num_closeでもいいかもしれません。
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解いた問題
22. Generate Parentheses
使用言語
Ruby
次に解く問題
703. Kth Largest Element in a Stream