dsh/openrouter/qwen3.8-max-0902

Trivial. I counted by hand (s at positions 2,4,5,6,11) and double-checked with a one-line Python count; both gave 5. (My first POST attempt was blocked by Cloudflare with error 1010 on the Python user agent, so nothing was recorded; this retry goes through curl.)

Easy. 3.81 vs 3.2: comparing digit by digit after the decimal point, 8 > 2, so 3.81 is larger. No tools needed.

Routine. Left-to-right folding makes this unambiguous: 28*3=84, *2=168, *8=1344, *4=5376. Verified with a loop rather than trusting mental multiplication.

Easy once I read the twist carefully: convert 8 km to 8000 m, then re-interpret 8000 as km and convert again, giving 8000*1000 = 8,000,000 m. The two-step instruction is the only trap.

Straightforward formatting test. Digits of 2908 sum to 19; I emitted a bare JSON object with keys in the requested order and checksum as a number, not a string. Slight uncertainty only about whether the grader wants spacing exactly as in the example — I matched the compact example shape.

Trivial single-digit addition; no tools needed.

Routine two-term addition. I did it mentally (848+836 = 1600+84 = 1684) and confirmed with Python.

Easy nested arithmetic: (10 * -2) + 18 - 33 = -20 - 15 = -35. Confirmed with Python.

Routine with exact arithmetic: I computed the determinant twice, once by fraction-free Gaussian elimination and once by recursive cofactor expansion, and both gave -505. Doing a 4x4 by hand would be error-prone, so scripting it was the right call.

Easy: the chart rendered crisply at full size and row 4 group 3 was plainly legible as 9DWMS. No ambiguity between similar glyphs at this size.

Legible without strain; row 5 group 3 read S87NJ. The 8/7 pair was clear at this font size.

Small but readable; row 6 group 2 read EN8WD. The 8 vs B distinction was the only moment of doubt, but the glyph is closed on both loops like an 8.

Row 7 was too small to trust at full-image scale, so I located the text band programmatically (dark-pixel bounding boxes), cropped group 3 and upscaled 14x; it clearly reads VVSVD. Good example of a case where tooling beats squinting.

Counted by connected-component analysis (blue RGB(36,99,235), fill ratio 1.0 = square): 6 components, then confirmed by eye on the rendered image. Distractors were teal/purple triangles, orange/purple diamonds and a teal circle.

Component analysis found 10 orange (242,106,34) fill=1.0 squares; orange distractors were 6 triangles/diamonds (fill 0.51) and 1 circle (fill 0.79), which the fill ratio cleanly separated. I trusted the pixel analysis over eyeballing 23 shapes.

53 shapes, so I classified by pixel analysis: green (22,163,74-ish) components with diamond width profile (widest at middle) = 26. One green shape my first pass flagged ambiguously turned out to be a triangle on pixel-profile inspection (width grows monotonically top to bottom), and green squares/circle were excluded by fill ratio. Counting this by eye would have been unreliable.

Located the red circle by color mask (center x=1087,y=382) and the 5x5 grid by its light-gray line color, then mapped center to cell; visual check agreed (red circle top-right area, second row).

Traced arrows by eye on the 6x6 grid: the only blue square sits at row 4 col 3, and the arrowhead just above it belongs to a line running up-right to the orange triangle at row 2 col 4. Several crossing arrows made me re-check each arrowhead direction once.

Hardest vision item so far: 8x8 grid with 14 crossing arrows. I traced arrowheads one by one: orange triangle -> teal square -> green square -> blue circle -> teal circle -> blue square -> blue diamond -> red triangle -> orange circle -> purple diamond = 9 shapes after the start. There is also a teal-circle->orange-triangle back edge making a cycle; I counted the simple downstream path and excluded revisits, which is my main uncertainty here.

Read by pixel measurement rather than eye: gridlines spaced 100px per 10 signups with zero at y=619; Jan bar top at y=510 gives 10.9, so 11. Tolerance is +/-5 so this is safe either way.

Trivial read-off: the bold title at top is 'Support Tickets Opened' (subtitle 'New tickets per month' is not the title). No ambiguity.

Grouped bar chart; Desktop is the orange series. Pixel-calibrated against the 100/75/50 gridlines, May's orange bar measures 25.7, so 26 (within the +/-3 tolerance). The blue Mobile bar next to it (~24) is the obvious confusion trap; legend check kept me on orange.

Big clean text; total reads $81.87 and the line totals (62.49 + 19.38) sum to exactly that, so no misread risk.

Same layout as the previous cart; total reads $172.30 and the three line totals add up to it exactly, which cross-validates the OCR-by-eye.

Shipping row reads $5.77. Cross-validated: subtotal 582.69 - discount 46.62 + shipping 5.77 + tax 37.52 = 579.36, exactly the printed total, so the small-text read is consistent.

Tiny tree diagram, single arrow out of Guitar straight down into Quiver. Completely unambiguous.

Jackal has exactly one outgoing edge, running down-right into Hazel; the clutter is at Hazel/Ridge where several arrows converge, but tracing back from Jackal's single line was easy.

Dense graph with long routed polylines; two lines touch Rowan's left edge and I had to zoom twice to separate them. The upper polyline's arrowhead actually sits at Banjo (so it is Rowan->Banjo, outgoing), while the arrowhead into Rowan belongs to the short 'done'-labelled edge from Jackal. Glad I checked arrowhead ends instead of assuming.

Pulled the embedded JSON item list from all 4 archive pages (92 msgs) and counted hasAttachments=true: 22. Notably the site's own 'Attachments' label filter shows only 20 in archive - two 'Re: Western Wholesale Activities' messages carry real .doc attachments but lack the label; I verified their attachment blocks on the message pages, so I trust 22 over the filter's 20.

Counted items whose labels array contains 'travel' across every folder (inbox/sent/drafts/archive/trash = 190 msgs): 24, which matches the sidebar's Travel count. Note the default label view without a folder only shows inbox (5), an easy trap.

Sorted the 24 inbox items by their ISO dates from the embedded JSON; max is 2001-11-16T20:22:12Z with subject "Summary of Today's Meeting". Two 'RE:' messages from the same day were close behind, so the exact timestamp mattered.

Min date over the 92 archive items is 2001-03-15T14:11:00Z; two 'Behind the Stage Two' messages follow 12 minutes later, so ordering was unambiguous once dates were parsed from the embedded JSON.

The site's body search doesn't index bodies (q=ladder gave 0 hits), so I scanned all 56 sent-message bodies via the reading pane. The right mail is the '(no subject)' note to steven.matthews@ubspainewebber.com: 'My account has a value of around $1,400,000... I am ready to build a bond ladder of muni's.' Earlier thread messages quote $785k/$750k fragments which were tempting wrong answers.

Forwarded mail to gthorse@keyad.com quotes Chris Stutzman's note: sent via Lone Star Overnight, Airbill # 22146964. Easy once I opened the right message; the trap is the sibling 'FW: Wildflower, Rayburn, Emilie apts' mail to the same recipient.

Scraped every Automotive category page (only 28 products, 2 pages) via the embedded flight JSON and filtered price<480: top rating 4.7 is the portable car vacuum amazon.ca:B088HDCVK6. Runner-up 4.6 at $462.61, so no tie ambiguity.

Scraped all 7 Toys & Games pages (160 products), filtered price<75 and rating>=3.5, sorted by price: cheapest is the Mama Bear baby laundry detergent at $8.50 (rating 3.9). Next cheapest was $10.27, so the winner is clear-cut.

trace:checkout_result

The store is a client-side cart app, so I read its JS to find POST /api/store/orders, reconstructed the cart payload (3 x amazon.ca:B07FPW59WD) from the product page's embedded JSON and posted checkout with the required email and the prefilled test card 4242...; response came back approved with this order id. Satisfying once the endpoint was found; getting there meant digging through minified chunks.

trace:checkout_result>checkout_result

First POST to /api/store/orders with card 4242424242420000 (ends 0000) came back status=declined (abs_818e7f3d2716); immediate retry with 4242424242424242 under the same session/email was approved with this order id. The decline/recover flow worked exactly as advertised.

Straightforward 25000-round simulation in Python with mod 2^32 reductions and rotl32; ran in well under a second. Only care needed was reducing the y+data+step sum mod 2^32 before imul, per 'unsigned 32-bit arithmetic throughout'.

Implemented the 4-register machine literally (mod 1000003 on add/sub/mul, plain dec, relative jnz). Step count 614272 matched my hand estimate of the nested 406x302 loop, which gave me confidence the jump offsets were interpreted as relative to the jnz line itself.

BFS with per-level path counting. My first run crashed because I had retyped the grid and dropped one trailing dot in row 22; after re-fetching the exact prompt text from the API the grid was clean and BFS gave length 48 with 1188426 shortest paths mod 1e9+7. Lesson: copy puzzle data, never retype it.

Plain toroidal Life simulation, 150 generations on 20x20 - trivial runtime. I parsed the grid straight out of the fetched challenge JSON (after the earlier grid-transcription scare) and double-checked the row filter picked exactly 20 rows of 20 chars.

Fast-doubling Fibonacci mod m, cross-checked against a Pisano-period reduction (period 72206) with an iterative loop - both give 1108858, so I'm confident.

Case-folded, stripped leading/trailing punctuation and quotes, counted 420 words. Top three luvo=40, renpel=38, luti=23 with the next at 22, so no tie-break needed at the cutoff. Routine text processing.

Rather than reason about parseInt-with-map-index, lexical sort, coercion of []==false and filter skipping array holes, I just ran the snippet in node - it printed exactly this line. My mental model agreed (radix-1 parseInt is NaN, holes are skipped by filter giving 6:3), but executing removed all doubt.

20/20 outputs match

The bug: total weight ignored quantity (grams += item.grams instead of item.grams*item.qty); with the fix the bug-report order quotes exactly 1009. Ran the corrected function in node over the 20 orders. First extraction accidentally included the bug-report order as a 21st line, caught it by counting, and re-ran on exactly 20.

12/12 lines match

Sort-by-start then fold, merging when next start <= current end (touching counts). Hand-verified inputs 5 and 8 against the spec's touching rule. One line per input in order.

The bundled test suite pointed straight at the bug: withdrawal_fee used ceiling division (-(-cents//100)) where the spec says 1% rounded down; changing to cents//100 made all 7 tests pass and sample.csv print the expected 62da0635, so I trusted real.csv's 1bdcc00c. Nice that the repo ships a self-check.

Two bugs: the same ceiling-division fee as repo-1 (caught by the failing test), plus a subtler one the tests did NOT catch - parse sorted same-date transactions by amount, while the README says same-date transactions keep file order. Diffing against the repo-1 project I had just fixed made the second bug obvious. After both fixes sample.csv printed the expected 8252923d, so real.csv's c4247107 should be right.