Codeforces 1065-C1/C2 Review: XOR Games and the Most Significant Bit
A review of the Codeforces 1065 C1/C2 XOR games, starting from the invariant total XOR and examining how the most significant bit and the last critical index d…
Lanqiao Cup 2026 Provincial Group B Review: Preparation, Contest Decisions, and Post-Contest Rework
A complete review of Lanqiao Cup 2026 Provincial Group B, from preparation and contest decisions to redoing the problems afterward, examining in-contest thinki…