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oda
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Dec 19, 2024
| - pros and cons | ||
| - セグ木の方ができることが多い。 | ||
| BITは逆元がない演算はできないので累積和くらいにしか使えないと書いてあったが、 | ||
| 逆元のないmaxを実装できてしまったのでよくわからない。 |
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通常は、任意の範囲での max を計算したかったりします。任意の範囲で逆元がない演算で結合した結果が欲しいときの話でしょう。
たとえば、一番下のノード以外の範囲の max を計算しようとすると BIT だとちょっと大変です。ただ、今回は、一番下を含む範囲しか計算しないので BIT でもいいですね。
oda
reviewed
Dec 19, 2024
| var updateHelper func(index, left, right int) | ||
| updateHelper = func(index, left, right int) { | ||
| if targetIndex == left && targetIndex == right { | ||
| st.tree[index] = max(st.tree[index], value) |
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本当ですね、st.tree[index] = value で動きました
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https://leetcode.com/problems/longest-increasing-subsequence/description/