PuzzlesProblems, puzzles, contest editorials, and mathematical magic.https://puzzles.neeldhara.blog/The 100 Prisoners Problem: A Beautiful Puzzle in Probabilityhttps://puzzles.neeldhara.blog/100-prisoners/https://puzzles.neeldhara.blog/100-prisoners/An interactive exploration of one of the most counterintuitive puzzles in probability theory, where 100 prisoners can escape with over 30% chance using a clever strategy.Mon, 13 Oct 2025 00:00:00 GMTGraph Algorithms: Assessment Highlightshttps://puzzles.neeldhara.blog/graph-algorithms-assessment/https://puzzles.neeldhara.blog/graph-algorithms-assessment/Interesting graph problems from recent course assessments with detailed solutions.Wed, 28 Feb 2024 00:00:00 GMTProject Euler: My Favorite Problems from 700+https://puzzles.neeldhara.blog/projecteuler-favorites/https://puzzles.neeldhara.blog/projecteuler-favorites/Curated problems from Project Euler that teach beautiful mathematical and algorithmic concepts.Sun, 25 Feb 2024 00:00:00 GMTThe Gilbreath Principle: When Chaos Creates Orderhttps://puzzles.neeldhara.blog/gilbreath-principle/https://puzzles.neeldhara.blog/gilbreath-principle/A mathematical card principle that seems impossible but always works - perfect for teaching algorithms.Thu, 15 Feb 2024 00:00:00 GMTBeyond Sudoku: Exploring Constraint Satisfaction Puzzleshttps://puzzles.neeldhara.blog/sudoku-variants/https://puzzles.neeldhara.blog/sudoku-variants/A journey through Sudoku variants and their algorithmic solutions.Sat, 10 Feb 2024 00:00:00 GMTThe Knight's Tour: An Interactive Explorationhttps://puzzles.neeldhara.blog/knights-tour-interactive/https://puzzles.neeldhara.blog/knights-tour-interactive/An interactive puzzle exploring the knight's tour problem with surprising mathematical connections.Tue, 30 Jan 2024 00:00:00 GMTThe Four Aces Miracle: A Self-Working Mathematical Marvelhttps://puzzles.neeldhara.blog/four-aces-miracle/https://puzzles.neeldhara.blog/four-aces-miracle/A card trick that teaches modular arithmetic and probability - perfect for the classroom.Sun, 28 Jan 2024 00:00:00 GMTDynamic Programming: Hidden Gems from Recent Contestshttps://puzzles.neeldhara.blog/dynamic-programming-gems/https://puzzles.neeldhara.blog/dynamic-programming-gems/Elegant dynamic programming problems that showcase beautiful techniques and insights.Thu, 25 Jan 2024 00:00:00 GMTIOI 2023: Breaking Down the Hardest Problemshttps://puzzles.neeldhara.blog/ioi-2023-analysis/https://puzzles.neeldhara.blog/ioi-2023-analysis/Deep analysis of the most challenging problems from the International Olympiad in Informatics 2023.Sat, 20 Jan 2024 00:00:00 GMT