All challenges

Move soil with a truck to level a grid while minimizing loading, travel, and unloading cost.

Visit ordered targets on a skating rink using moves, slides, and block alterations.

Choose a route string that still reaches the goal with high probability after omissions.

Plan a closed patrol route that sees all road cells while keeping travel cost low.

Type a string containing all lucky words while minimizing keyboard movement cost.

Route offline LLM prompts to cheap, mid, or expensive model tiers for accuracy-cost tradeoffs.

Hire optional residents as shuttle routes to reduce weighted travel demand over islands.

Produce source-grid routes for noisy path-feedback instances.

Find a simple grid path that visits required row intervals in a valid order.

Pick one landing point per city and order a closed drone delivery route.

Select delivery requests and a route that completes them with low travel time.

Design low-cost multi-cloud broadcast routes under throughput and bandwidth constraints.