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feat(coding-challenges): stack - decode string with an explicit context stack - #97
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…xt stack Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Adds
coding-challenges/stack/decode_string.py(Medium) — the classic3[a2[bc]]decode via an explicit stack of(outside_text, multiplier)frames, in a single left-to-right pass. Covers empty input, no brackets, nesting (the case a flat parse cannot do), and multi-digit multipliers, plus 200 random valid encodings cross-checked against a recursive reference parser.Validation:
python coding-challenges/stack/decode_string.pypassed; full suitepython scripts/run_challenges.py→ 52/52.