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Step-by-step solutions and mathematical derivations for the 2026 Xidian University entrance exam (fill-in-the-blanks and analytical problems).

Following a conceptual progression: network structure, gradient descent, embedding vectors, Transformer, attention mechanisms, and MLP fact storage.

A study note on Raft covering replicated state machines, elections, log replication, safety, cluster membership changes, and snapshots.

March-June 2024, primarily based on original solution records, including ABC 340 F, 341 D, 346 D/E/F, 356 D/E/F.

April~July 2024, primarily based on original solution records, including ABC 348 E/F, 350 D/E, 351 D/E/F, 357 D/E/F, 358 C/E/G, 360 E.

Solutions from Jan-Jul 2024, focusing on construction, bit operations, and greedy problems from Codeforces.

Solutions from Dec 2023 to Jul 2024, covering prefix sums, strings, and transformation-oriented Codeforces problems.