思考题 during OI recovery Rubbish Problem Maybe you have heard of the evil problem Hilbert's Hedge Maze and here's another very fun problem! You have n items arranged in rows. Each row contains r items and the items are arranged from left to right,……

概述 本文为XGN（后文称笔者）与其母（后文称母）于令和五年八月六日到十四日的日本国游记，在HHS博客上发表，XGN博客上转录。 「日行紀要」（にこうきよう）？ 在笔者之前，已经有一篇翔实而又生动的游记——日本国游记 笔者不及Z氏的文笔和才华，本文也只是简单概述所……

思考题 with hard-to-write checker and interactor Peripheral Lightup! Note: this is not a traditional problem. Follow the instruction in the statement to help construct your solution Lead-in: The Palace is celebrating a festival with LED lights! Ins……

Have you ever imagined a crossover between Touhou and Spice&Wolf? Now there is! Introduction S&W:MoF is a fangame of Touhou and Spice and Wolf: My year with Holo. In the game, the player roleplays the merchant Lawrence and embarks on a jour……

大家好，笔者是2023届高中毕业生XGN。最近有幸参加了南京大学的2023届强基计划招生，现分享一下经历： 初赛 初赛人很多，在仙林校区进行。笔者报名的专业考察内容是「数理探究」（aka数学+物理）。考试时间1.5h，12道数学，12道物理，选择题，6个选项，满分100.每门学……

大家好，笔者是2023届高中毕业生XGN的说。今日参加了国科大和南大的江苏省综合评价考试，现在和大家分享一下流程和题目： 国科大 需要准备的材料是综评报名表（要上交）、身份证、证书原件、证书复印件（要上交） 报考学生会被随机分到不同时间段参加考试，每个时间段……

Solved! Difficulty: Div2C 思考题 in dreamland Construct it XGN dreamt about the following problem when sleeping: You are given a positive integer n (2\leq n\leq 10^8). Output an arithmetic expression that yields the value n with the following……

思考题 which is an adaptation from a popular problem. The source problem is very popular. IDK if this adaptation has been made or not. Adaptation There are N people indexed from 1 to N in a room. Each of them is given a hat of a random color. The t……

Finally some geometry! Maybe very easy though. Currently I am undergoing the College Entrance Exam(GK) so I don't have many ideas for Competitive Programming problems. This problem is inspired by some math problem in GK Simulation. Of course, this ……