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When Problem-Setting Syndrome Strikes, Start with the Strange CoreBased on the original "Problem-Setting Syndrome Struck" notes, preserving the "Magic Bag" problem, derivation, code, and extension directions.
16 min read English -
Why Polynomial Algorithms Matter in Competitive ProgrammingFrom convolution, point-value representation, FFT/NTT to formal power series - understanding what this polynomial toolkit is really solving.
17 min read English -
From Convolution to Inversion: What Mobius Inversion DoesBased on original number theory notes, covering Dirichlet convolution, Möbius function, inversion techniques, and common identities.
9 min read English -
My Intro to Generating Functions: Let Coefficients Be AnswersBuilt from the original notes, restoring ordinary generating functions, exponential generating functions, modeling intuition, and several typical problems.
12 min read English -
A Framework for Judging Game Theory in ContestsBased on original game theory notes, supplementing the judgment framework, Bash/Nim, Misere games, Fibonacci game, Wythoff's game, and SG function.
13 min read English -
Search Is Not Brute Force: DFS, BFS, and DPBuilt from original search problem sets and solution notes, organizing DFS, BFS, pruning, shortest paths, and state-space search.
28 min read English -
Sieve Methods Beyond Primes: A Unified View of Linear SieveBased on original number theory notes, covering prime sieves, Euler's totient function, and Wilson's theorem.
10 min read English -
From Divisibility to Congruence: Number Theory BasicsBased on original number theory notes, covering gcd, lcm, Bezout, exgcd, fast power, modular inverse, and CRT.
9 min read English