欢迎来到Hell Hole Studios Blog! 这是一个由HHS成员共同维护的blog网站，主要内容包括游戏、技术、数学、信息竞赛和旅游日记，主要blog语言有中文、英文（备注：点击标签来查看同标签内容）。下面的链接可能会帮助到您更好的浏览本站。 Welcome to the Hell Hole Stu……

This is a hard version of Ep. 67. If you prefer an easier problem, please see OBCYSIO67. Meeting Point Given a directed graph G of n vertices and m edges. A single vertex S is called the starting point and a single vertex T is called the finish poi……

Solved! Difficulty: D2C Pretty basic exercise problem from FLA This is an easy version of Ep. 68. If you prefer harder problems, please visit here. Meeting Point Given a directed graph G of n vertices and m edges. A single vertex S is called ……

Context 笔者作为交换生报名了新加坡国立大学的日语课程，由于曾经参加过日语训练，需要参加日语Placement Test。参加链接如下：CLS。 作为参考，笔者的阅读水平为N2，听力水平为N3，但是由于参加的是应试课程，没有口语和写作经验。 筆者は交換留学生として、会話と……

This new series is primarily a continuation of the old series Test Logic with a slightly different flavour, namely it focuses on a very concrete and special axiom system - ZF set theory. Note that old chapters might be updated as well. 0.0 Introduc……

Solved! Difficulty: Div2C Classic 思考题 HP You are given a grid of n*m cells. You start from a starting cell S and can move up, down, left or right in one step without leaving the grid. Find: is it possible to visit each cell once and exactl……

配置文件 -> 自定义配置文件 -> HTTP块 加入以下内容（请自行将＄替换成$，f*ck wordpress） map ＄request_method ＄proxy_method { default ＄request_method; HEAD GET; } URL代理 -> 设置 -> 自定义配置 加入如下内容 proxy_method $proxy_method; ……

  “穿过旷野的风你慢些走，我用奔跑告诉你我不回头♪”，西边的山脉在这里放缓脚步，南方的城市在这里变成村落，在一切都回到淳朴自然的地方，呼伦贝尔草原的夜，也能听见风中的蝉鸣吗？   将疲惫与暑热甩在身后，走出呼伦贝尔海拉尔机场，悠闲的云朵吸饱了灿烂的阳光，……

Solved Difficulty: D2C 思考题 inspired by Saionji Video Channel Eastmost Eki There are n points on a 2D plane. You can select any real point as pivot in the rectangle bounded by (a,b) and (c,d) and rotate the entire plane by d degree clockwis……

思考题 inspired by car lanes Car Lane In Ryuto the capital of the Dragon Kingdom, there is an intersection with k+1 exits. On one lane of one exit, there is a queue of n cars. The i-th car in the queue wants to go in the direction d_i (1\leq d_i\le……

Solved Difficulty: D2C-D2D 思考题 inspired by Create Mod Assembly Line There is an assembly line consisting of n machines. The i-th machine on the line holds an infinitely long input queue and a processing time of t_i seconds. The machines wo……