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我会说我写的那篇 树状数组优化逆康托展开正确性有问题么（ |
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逆康托展开应该可以用线段树做到NlogN吧。 |
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线段树好像可以...不知道怎么实现 |
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树状数组用途太广了qwq |
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可以树状数组的不就都可以线段树么 |
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但树状数组明显要好写很多（逃 |
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https://oi-wiki.org/math/cantor/
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