problem-sets

This repository contains my answers to problem sets from a wide range of judges, including Aizu, Advent of Code, CodeChef, Codeforces, Codegolf, CSES, Deep-ML, DMOJ, EOlymp, HackerRank, Kattis, KiloNova, Leetcode, LibreOJ, Perl Weekly Review, Project Euler, SPOJ, Timus, and more.

Note: These solutions are intended as a learning experience rather than optimal references. Most were written directly to the relevant online judges.

See below for the current coverage and progress, and refer to issues for open tasks (like building a scraper).

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Coverage at a Glance

• Websites/judges covered: 25
• Total problems tracked: 65,720 (and growing)
• Solved: 227
• Progress: ≈ 0.35%   (calculated as (227 / 65,720) × 100)

_{See also: ./prog.sh for a summary script.}

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Milestones

Advent of Code 2025 solved!

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TODO

Problem Name	Directory
Borya's Diagnosis	cf/main/879/a
The Next Palindrome	cc/5
Like the Bitset	cf/main/2136/b

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Community Notes

Join our Discord server (Work in Progress):
Weekly contests, editorials, code/runtime comparisons, and personal progress tracking. Plans include a /videos/ section for walkthroughs and more.

Discord Channels (planned):

• #announcements — Contest schedules, links, and judge picks.
• #help — Hints (no spoilers during contests).
• #systems — Tooling, IDE setup, scripts (e.g., prog.sh), and benchmarks.
• • more. . . - :)

Weekly Contest Schedule:

• New schedule every Sunday.
• At least one multi-judge set midweek and one on weekends.
• Rotating judge sources for diverse coverage. (Subject to university workload.)

Participation Workflow (planned):

1. Check #announcements for the week's picks.
2. Work locally during competition windows.
3. After lock, share solutions and editorials.
4. Discuss blocks in #help and note tooling in #systems.

Bot Development:
Open to recommendations for a submissions bot! See aoc golf bot for inspiration. Suggest ideas in Discord.

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Aim & Current Stats

As of 2025-10-14

Platform	Solutions
Codeforces	11,352
CSES	362
Project Euler	954
...	...

Solution Status

pie showData
    "Solved" : 223
    "Unsolved" : 65497

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Solution Languages used

pie showData
    "C++" : 97
    "Shell" : 5
    "Python" : 11
    "Haskell" : 4
    "Kotlin" : 1
    "Perl" : 1

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Git Formatting

• When adding a solution file, use platform aliases in commit messages:

  • cf for Codeforces
  • cses for CSES
  • ... as specified in below websites

• Commit Message Example:

  • Adding a new Codeforces solution:
    cf: solution for problem 123A

• If you add a new file unrelated to problem solutions (e.g., scripts, configs), use the chore or init or others as general conventions as prefixes:

  • chore: add prog.sh for summary automation
  • init: setup initial project structure
  • refactor: change the repository without changing program code

Websites mentioned

These are the lists of websites I am willing to contribute solutions to, along with their shorthand git aliases which I construct when I make a commit.

• aoc :: Advent of Code
• aiz :: Aizu
• cc :: CodeChef
• cf :: Codeforces
• cg :: CodeGolf
• cses:: CSES
• dml :: Deep-ML
• dmoj:: DM::OJ
• eol :: Eolymp
• hr :: HackerRank
• js :: Jane Street
• kat :: Kattis
• kn :: Kilonova
• lc :: LeetCode
• lboj:: LibreOJ
• lioj:: LightOJ
• oj :: oj.uz
• pwc :: Perl The Weekly Challenge
• pe :: Project Euler
• qoj :: QOJ.ac
• spoj:: SphereOJ
• tim :: Timus
• tlx :: TLX
• toph:: Toph
• yos :: yosupo

Redundancies:

Problem Name	Presence In	Directory
aplusb	Codeforces (ACMSGURU), Timus, Kilonova, LibreOJ	Timus

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Feel free to open issues for suggestions, improvements, or questions! - trintler