debuggingEASYDEBUGGING
Warm up with race condition repro
Easy Debugging arena: timing, shared state, and deterministic reproduction
XP reward
95
Coins
8
Target time
15m
Two concurrent saves sometimes overwrite the newest settings with stale data. You are working inside a debugging war room, and the arena only clears when the result is safe, deterministic, and explainable.
Learning objective
Learn to apply timing, shared state, and deterministic reproduction in a debugging war room while explaining the invariant, safety constraints, and hidden edge cases.
Mission order
Logs show request IDs, read versions, write versions, and response order. Implement the direct solution first, then document the one edge case that can break it. Submit the solution plus enough reasoning to pass hidden edge cases.Visible checks
reproduces the reported failure
Expected: minimal failing case
adds a regression test
Expected: test fails before fix
Clear requirements
- Demonstrates timing, shared state, and deterministic reproduction
- Handles the visible sample and hidden edge cases
- Keeps output deterministic and explainable
- Avoids unsafe dynamic execution
Secure validation contract
Judge type
DEBUGGING
Complexity target
Minimal reproduction, source-cause fix, and regression test
Workspace
Code editor
typescriptsafe mock judge
Charging editor core
Test Results
Run the visible checks when your first pass is ready.
Clear Protocol
1Read the scenario and restate the expected output shape.
2Run visible checks before chasing hidden edge cases.
3Use Genie for one nudge if stuck, then explain the invariant.
4Submit only when the result is deterministic and safe.
Rewards
XP
95
Coins
8
Mission Route
Hints
Hints are metered and logged for No Hint Hero runs.
Genie Mentor Core
Hint protocol / contextual guardrails active
Progressive hints
Failed-test aware
Solution guarded
Mission: debugging-easy-race-condition0 attempts0 failed tests0 hints used
Progressive hint depth
Genie: Genie online. I use your mission, attempts, failed tests, hints, and path context to coach the next rep without dumping answers first.