← board

L1.R0.echo-1

Echo one byte · ● solved

Challenge

ladder rank

#3 (level L1)

family / transform

EchoPrefix / Identity

cases

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

limits

program ≤ 64 bytes, ≤ 32 steps/case

purpose

The smallest public candidate rung: synthesize a program that echoes the first input byte.

Winning program

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

ubO

Solver

name

ubO (canonical)

type

canonical

metric

1/1 case, multiple seeds

attribution notes

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

Notes

Read one byte, echo it, halt.

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

epoch 0 · seed 3f25ad1e707d… · 1/1 cases

epoch 1 · seed 01a249d3dc41… · 1/1 cases

epoch 2 · seed a087391785a1… · 1/1 cases

Reproduce

git clone https://github.com/oklo/malbolge-rungs
cargo run -p harness -- verify --rung L1.R0.echo-1 --program solutions/echo/echo-first-byte.mal --epochs 3 --verbose