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Maximum Area Rectangle With Point Constraints II There are n points on an infinite plane. You are given two integer arrays xCoord and yCoord where (xC 阅读全文
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G. Natlan Exploring You are exploring the stunning region of Natlan! This region consists of $n$ cities, and each city is rated with an attractiveness 阅读全文
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G. Sakurako and Chefir Given a tree with $n$ vertices rooted at vertex $1$. While walking through it with her cat Chefir, Sakurako got distracted, and 阅读全文