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Module VC-06VIBECODE

Locate the First Regression

VIBECODE • Vibe Coding: AI-First Software Delivery

Browser-only practice

Problem Statement

Stage: Debug with Evidence

A commit history has recorded pass/fail evidence.

Deliverable

The first failing commit after the last passing state.

Input and output contract

Read commit|pass or commit|fail records in chronological order; print the first fail, or none.

Acceptance criteria

  1. Ignore unknown statuses.
  2. Preserve chronological order.
  3. Return none when all known commits pass.

Suggested vibe loop

Read AGENTS.md, connect your Ollama or OpenAI-compatible provider in the browser, and ask the agent to restate the contract and make one small verifiable change. Watch edits stream into app.py while the editor is locked, then review the result and run the visible example. Keep the checkpoint when the evidence is correct or use Undo to restore it. The browser-client agent does not require an administrator gateway or API key.

Constraints

Use Python 3 standard library only. Read and follow AGENTS.md, keep main.py as the entry point, and implement solve(raw) in app.py.

Sample Testcases

Submit runs every public testcase in this browser. Results and code never leave this device.

Sample #1
Public sample
Input
a1|pass
b2|pass
c3|fail
d4|fail
Output
c3
Explanation
Finds the regression boundary.

Web terminal

C, C++, Java, and Python run locally in a browser VM. No worker or visualizer is used.

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