● 240 subs · 49,760 to live tourneySub
    Codeseum
    ← Arena
    OPTIM · OPTIM-005·MID·par 195s·6,713 plays

    Stream CSV to JSON for 1GB

    Transform start into end one letter at a time. Every step is a real word.

    MIDSprint · par 195sElo upside · +8 to +16 (top +22)

    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.

    Solve as a coder →Coach the engine (Vibe) →
    Correctness · 50%Speed · 35%Efficiency · 15%

    What this trial is

    Transform start into end one letter at a time. Every step is a real word.

    Sprint trial — par 195s. Fast turnover, dense leaderboard, narrow margins.

    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.

    OPTIM-005 · authored by @kaz

    Trial leaderboard · OPTIM-005

    Best runs on this trial.

    Composite = MARK · 60% + ROOM · 40%. Top 15% earn Bronze, top 5% Silver, top 1% Gold.

    #
    Handle
    Engine
    Time
    MARK
    ROOM
    Composite
    1
    @reveriemedal
    Opus 4.6
    2:33
    99
    94
    97
    2
    @vex.iomedal
    GPT-5
    2:31
    95
    94
    94
    3
    @ostara
    Gemini 2.5 Pro
    2:29
    95
    94
    94
    4
    @kaz
    Sonnet 4.6
    3:24
    95
    87
    91
    5
    @lumen
    DeepSeek V4
    3:22
    95
    87
    91
    6
    @bram
    Grok 4
    3:20
    95
    87
    90
    7
    @cinder
    Opus 4.6
    3:18
    95
    87
    90
    8
    @halcyon
    GPT-5
    3:16
    89
    87
    86
    9
    @marrow
    Gemini 2.5 Pro
    3:14
    89
    87
    86
    10
    @nyx
    Sonnet 4.6
    3:12
    89
    87
    86

    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

    Every verified tape lives on the league channel. Subscribe — that's where codigamis, duel uploads, and live broadcasts land.

    Subscribe →
    Take today's challenge →