Practice

Problem Solving

I practice what I teach—selected records across competitive-programming judges, with annotated notes on the reasoning behind recent solutions.

New · September 2026

Problem-Solving Notebook

Notebook 01 / Divisibility

Increment All Divisors

Turn repeated operations on divisors into a triangular system, express every operation count as an affine function of the final value, and reduce feasibility to one interval.

AtCoder ABC 474 F · reverse divisor traversal · O(N log N)Read the annotated solution →

Selected Records

solved.ac

3129

Rating — Master tier, ranked #19 overall

View profile → Kattis

6803.0

Points on the global problem-solving platform

View profile → Codeforces

5138

Problems solved — ranked #71 by solve count

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