[testcase] Hack a wrong implementation of Li Chao Tree.#1383
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maspypy
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Feb 2, 2026
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As described in the title, there are some Chinese CP candidates who implement a kind of Li Chao tree that doesn't swap functions on the nodes when performing insert.
However, this can be hacked by inserting$y = \lfloor \frac{l + r}{2} \rfloor$ for $[l, r]$ and a lot of $y = x$ . In this situation all the nodes on the tree will be traversed when inserting $y = x$ , which can lead to a wrong time complexity of $O(nq)$ .
QOJ has also added such hack.