2025 12 problems
ICPC 12 statement texts and 12 PDFs are available for this year.
- A. A-Skew-ed Reasoning
- B. Blackboard Game
- C. Bride of Pipe Stream
- D. Buggy Rover
Contest archive plus long-form study notes.
This section has six public branches: the ICPC archive, the IOI archive, the LeetCode archive, the CSES archive, the Codeforces 3500+ archive, and a growing Data Structures & Algorithms notebook. The contest pages keep explanations and code tied to source files; the LeetCode branch emphasizes interview-facing pattern recognition; the DSA branch keeps reusable ideas in longer note form.
414 problem pages
85 published DSA notes
6 public branches
May 21, 2026 most recently updated page
Branches
Start with a public branch
The contest archives browse by track/year or official category, while the DSA branch acts as a reusable knowledge base.
01 ICPC
ICPC World Finals
212 problems across 18 years. 212 statement texts and 212 PDFs are mirrored in the archive.
Browse ICPC 02 IOIInternational Olympiad in Informatics
177 problems across 36 years. Each task page centers the write-up and code.
Browse IOI 03 LeetCodeLeetCode Solutions
8 curated interview-focused solutions across 8 active categories, with pattern recognition, original summaries, and clean C++ implementations.
Browse LeetCode 04 DSAData Structures & Algorithms
85 published notes across 9 categories, all kept in TeX plus standalone C++ so the write-up and implementation stay editable.
Browse DSA notes 05 CSESCSES Problem Set
15 published solutions across 11 official categories, with original summaries, rendered editorials, and exact C++ source files.
Browse CSES 06 CODEFORCESCodeforces 3500+ Problems
2 published deep dives for very hard Codeforces problems, each kept intentionally small-batch and source-first.
Browse Codeforces 3500+ Browse by year
Recent contest years
The year page is the main browsing layer: it lists the problems, resource badges, and direct links to each solution page.
2024 12 problems
ICPC 12 statement texts and 12 PDFs are available for this year.
- A. Billboards
- B. Bingo for the Win!
- C. Citizenship
- D. Doubles Horseback Wrestling
2024 6 problems
IOI Task pages are grouped here by year before you drill down into an individual problem.
- Hieroglyphs
- Message
- Mosaic
- Nile
2023 11 problems
ICPC 11 statement texts and 11 PDFs are available for this year.
- A. Riddle of the Sphinx
- B. Schedule
- C. Three Kinds of Dice
- D. Carl’s Vacation
2023 5 problems
IOI Task pages are grouped here by year before you drill down into an individual problem.
- Beech Tree
- Closing Time
- Longest Trip
- Overtaking
2022 11 problems
ICPC 11 statement texts and 11 PDFs are available for this year.
- P. Turning Red
- Q. Doing the Container Shuffle
- R. Zoo Management
- S. Bridging the Gap
Recent additions
Recently updated problem pages
These stay secondary to the track/year browse flow, but they are still useful when you want to see what changed most recently.
01
LeetCode Two Pointers
02 3Sum
Return every distinct triplet whose values sum to zero without duplicating answers.
LeetCode Sliding Window
03 Longest Substring Without Repeating Characters
Track the longest contiguous substring whose characters stay unique.
LeetCode Stack
04 Daily Temperatures
For each day, compute how far away the next warmer temperature appears.
LeetCode Graph
05 Number of Islands
Count how many connected land components appear in a binary grid.
LeetCode Tree
06 Lowest Common Ancestor of a Binary Tree
Find the lowest node in a binary tree whose subtree contains both target nodes.
IOI 2024
Tree
Given a rooted tree with N nodes, each with weight W[i]. Assign integer ``coefficients'' C[i] to each node such that for every node i, the sum of coefficients in its subtree is between L and R (given per query). Minim...