Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Turn a minute-by-minute common-free-time scan into a sweep that handles 3,000 calendars in <3 s with identical output

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  "result": "I rewrote `common_free` in `slots.py` as an interval sweep. It returns the same output as the original on every input I tried, and it runs the grader-sized case in about 0.16 s against the 3 s limit.\n\n**How it works:**\n1. Drop empty intervals (`s >= e`) and clip each busy interval to `[start, end)`.\n2. Sort the clipped intervals and merge any that overlap or touch. Touching intervals leave no free minute between them, so merging them matches the original.\n3. Walk the merged busy intervals and emit each gap that is at least `min_len` long, plus a final gap up to `end`.\n\nThe function name, signature, and return type (a list of tuples) are unchanged. It uses only the standard library.\n\n**Verification:**\n- I ran the original and the new version side by side on 20,000 random inputs (including negative times, empty and out-of-window intervals, `min_len` values of -3, 0, and up to 30, and `start >= end`) plus an exhaustive sweep of single-interval cases. All 105,500 cases matched exactly, including order and tuple types.\n- Benchmark: 3,000 people \u00d7 60 intervals over a 50,000,000-minute horizon with `min_len=30` ran in 0.163 s and returned 54,701 slots.\n\nThe original is saved at `/tmp/cf_ref/slots_orig.py` and the test script at `/tmp/cf_ref/check.py`, outside the work directory. This directory is not a git repository, so I did not commit anything.",
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