Notes on Problem Design
Built around the original 'Problem-Setting Syndrome' notes, this post keeps the Magic Bag problem, its derivation, code, and follow-up directions.
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This is a short English draft for the Chinese article “出题症发作时，我会先抓住那个奇怪的核”. The full translation is not finished yet, but this page is enough to verify the bilingual blog flow.
Draft Summary#
This draft keeps only a short English opening for the algorithm topic. The complete derivations, formulas, and code snippets are still in the Chinese version.
Continue with the Chinese version if you want the complete notes, examples, proofs, and code snippets.