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L2.R1.reverse-1

Reverse one byte · ● solved

Challenge

ladder rank

#4 (level L2)

family / transform

Transform / Reverse

cases

1 case(s), 1 output byte(s)

limits

program ≤ 256 bytes, ≤ 2048 steps/case

purpose

One-byte reverse is behaviorally trivial but useful as a transform-family sanity check.

Winning program

solutions/echo/echo-first-byte.mal · 4 bytes · sha256 7e06b0c66f3253e37e419ad8b59365950c5d484db497487c95a4bad6cc1bb2a7

ubO

Solver

name

ubO (canonical)

type

canonical

metric

1/1 case, 5 seeds

attribution notes

Minimal 3-instruction classic-Malbolge program (IN, OUT, HALT); long predates this project.

Notes

1-byte reverse is the identity, so ubO passes; the registry marks this a transform-family sanity check.

Verification transcript (native VM, 3 epoch(s))

epoch 0 · seed 27342d64363b… · 1/1 cases

epoch 1 · seed b8d24b16a433… · 1/1 cases

epoch 2 · seed 174c7c4584cb… · 1/1 cases

Reproduce

git clone https://github.com/oklo/malbolge-rungs
cargo run -p harness -- verify --rung L2.R1.reverse-1 --program solutions/echo/echo-first-byte.mal --epochs 3 --verbose