The off-by-one in the calendar week
Week numbers drift by one near year boundaries in three locales. Find it without reaching for a date library.
Contract
solve(input: any) → any
Return the indices, not the values. Order matters.
Visible tests
- in: [2, 7, 11, 15], target: 9→ [0, 1]
- in: [3, 2, 4], target: 6→ [1, 2]
- in: [3, 3], target: 6→ [0, 1]
+ 7 hidden tests fire on submit
Step in
Current Codigami · 1:42 by @reverie
Your best · 1:58
Break it for +12 Elo. Fall short for −3.
Same problem. Two ways to play. Both rank on the same Elo.
What this trial is
Week numbers drift by one near year boundaries in three locales. Find it without reaching for a date library.
Long-form trial — par ~10 minutes. Designed for a full session; the tape itself is the artifact, and peers will scrub through it.
Elo upside if you nail it
Solid run
+8 to +16
Top run
+22
Medal line
silver
Where most players live. A clean MARK + ROOM here moves the needle every week.
Solo Elo · MARK ÷ 100 vs field 2100, K-32. Codesport duel wins multiply by ×1.25, losses by ×0.40.
Trial leaderboard · DEBUG-010
Best runs on this trial.
Composite = MARK · 60% + ROOM · 40%. Top 15% earn Bronze, top 5% Silver, top 1% Gold.
Top 15% on this trial earns Bronze; top 5% Silver; top 1% Gold. Trial trophies are per-trial visual rewards; the Elo ladder (Demi Coder → Master Coder) is the credential.
@Codeseum on YouTube
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