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CodeForces Round 1081 Recap

The February 21st-23rd Competitive Programming Experience
codeforces
recap
2026
This post is part of the Februrary 21st-23rd set of posts detailing a rather chaotic day of competitive programming, hence why I have an old classic introduction image of…
Feb 23, 2026
Alexander Wen

LeetCode Weekly 490 Editorial

The February 21st-23rd Full Competitive Programming Experience
codeforces
recap
2026
This contest was part of a sequence of contests done in rapid succession, for which further context can be found in the February 23rd update for this post.
Feb 23, 2026
Alexander Wen

Starters 226 Recap

competitive programming
codechef
recap
2026
I seem to have not checked if this contest was rated beforehand, and it just happens this Starters contest is unranked for 6 star and up. Either way, this is an overview of…
Feb 20, 2026
Alexander Wen

What is Meant By ‘Problem Solving’ in Competitive Programming

Meta Hacker Cup 2024 Round 2, Problem A2
competitive programming
2026
When asked why I do competitive programming, I’ve always said that it is for the problem solving process. This is obviously unclear on its own, but there are certain…
Feb 15, 2026
Alexander Wen

Starters 224 Recap

competitive programming
codechef
recap
2026
The last time I did a CodeChef contest was September 18th, 2024, and I wanted the first recap of HonestCode to be a CodeForces contest so I could showcase a decent start…
Feb 6, 2026
Alexander Wen
 

A Simple String Hashing Method

data structures
2026
Modular arithmetic simplified is the remainder of integer division; in the example sense, for any values \(a,b\) and a non-zero value \(m\), \(a \cong b \text{ (mod } m)\) if…
Feb 1, 2026
Alexander Wen

Rule of 100 Million: Estimating Big-O Runtime Expectations

competitive programming
2026
There is a reason why experienced competitive programmers can look at a problem and then within seconds, be able to determine a basic idea of the solution. All problems in…
Jan 24, 2026
Alexander Wen

An Intro to Segment Trees and Their Applicability to Database Management Systems

2026
analysis
It goes without saying that PostgreSQL, MondoDB, Redis, and all other database management systems require efficient methods for managing and querying their stored databases.…
Jan 16, 2026
Alexander Wen

Sparse Tables

data structures
2026
Suppose a hiker is mapping out a mountain range. They walk across the mountain and record their current altitude in meters at important landmarks in this diagram:
Jan 8, 2026
Alexander Wen
 

June 2022 Archive Log

competitive programming
2022
archive
Much of these two weeks saw myself mainly preparing applications for a potential co-op next semester, so I was only able to participate in one contest this time. However…
Jul 4, 2022
Alexander Wen

May 2022 Archive Log

competitive programming
2022
archive
Well then, congratulations to myself (sarcastically) for actually beginning this post in the same month this post is supposed to recap. I can finally say that this blog will…
Jun 8, 2022
Alexander Wen

April 2022 Archive Log

competitive programming
2022
archive
Welcome back to my attempt to catch up this journal to the current present day of May 11th. Optimistically, at the rate I’m going, this journal will finally be up to date by…
May 26, 2022
Alexander Wen

March 2022 Archive Log

competitive programming
2022
archive
Note: Most of this entry was written at the end of March, mostly because SFU Midterms and projects happened. I’m still in the heavy part of my course load this term, so the…
May 10, 2022
Alexander Wen

February 2022 Archive Log

competitive programming
2022
archive
Note: Both of the logs here are being written around the end of February/start of March and are relying on personal journal logs. As of next month all new logs will be…
Feb 28, 2022
Alexander Wen
 

January 2022 Archive Log

competitive programming
2022
archive
Note: this journal entry was written on February 11th mostly by referring to entries from my personal journal log in this time period.
Feb 11, 2022
Alexander Wen
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