Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Turn weekly ad-platform exports into an exact wasted-spend report

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  "result": "I wrote `solve.py` and ran it on the given exports. It writes `answer.json` and `chart.svg` in about 0.06 seconds. I checked the output by hand; I don't have the hidden scoring checks, so those haven't been run.\n\n**Results on this week's data:**\n- **Rows dropped:** 5 duplicates, 25 out of range and 2 non-data rows (the two `Total:` rows in the Google file).\n- **Units:** 15 in total.\n- **Spend and waste:** $3,636.06 spent, of which $2,178.61 (59.9%) is wasted. Google has $603.93 wasted out of $1,301.91; Meta has $1,574.68 wasted out of $2,334.15.\n- **Top 5 wasted, all Meta:**\n  1. Competitor / 35-54\n  2. Brand / Broad\n  3. Competitor / Remarketing 30d\n  4. Competitor / Broad\n  5. Video / Top Funnel\n\n**How the calculations are done:**\n- All money is summed with Python's `Decimal` type, so there are no floating-point errors. Values are rounded half-up only at the end.\n- The high-CPA test uses the unrounded CPA.\n- Totals are sums of the rounded unit values, as the brief asks.\n- Meta `Results` count as conversions only when the indicator is the pixel purchase, so rows that report link clicks have 0 conversions.\n- Names are matched after trimming spaces and ignoring case, so `\" Video\"`, `\"Video \"` and `\"COMPETITOR\"` merge with their plain forms.\n\n**`chart.svg`:** It contains no scripts, links or external references. It parses as valid XML and has `wasted-bars` plus `bar-1` to `bar-5`.\n\n**Where the brief was ambiguous, I chose:**\n- **Duplicates:** lines are compared with their line endings removed, because the files mix Windows and Unix line endings. On these files the counts are the same either way.\n- **Name spelling:** a unit's reported name is the first spelling among rows kept for the week, not rows dropped for being out of range.\n- **Blank lines:** ignored and not counted as drops.\n- **Empty totals:** if total spend is 0, `wasted_pct` is reported as 0.",
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