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⚡ Bolt: Replace O(N²) nested loops with O(N) hash map lookup for exercise-solution matching #102

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⚡ Bolt: Replace O(N²) nested loops with O(N) hash map lookup for exercise-solution matching #102

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4 changes: 4 additions & 0 deletions .jules/bolt.md
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## 2025-05-20 - Pre-compiling Regex in Loops
**Learning:** `re.findall(pattern, string)` recompiles (or retrieves from cache) the pattern on every call. In high-frequency functions called inside loops (like complexity estimation), this overhead adds up.
**Action:** Always pre-compile regexes (`re.compile`) into module-level or class-level constants if they are used repeatedly, especially in tight loops or recursive functions.

## 2024-05-31 - [O(N^2) Solution Lookup Bottleneck]
**Learning:** Matching exercises to solutions using nested loops causes O(N^2) time complexity, becoming a bottleneck as material counts increase. Dictionary comprehensions/loops reduce this to O(N).
**Action:** Always pre-compute a lookup dictionary (e.g. `solutions_dict[label] = sol`) before iterating over items that need matching, preserving first-match behavior with `if key not in dict`.
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