From brute force
to optimal.
Every approach, ranked — with complexity analysis, visual dry runs, and the pattern underneath.
What it does
Brute force, better, and optimal in a single response — each with its own complexity, so you can see what the trade-off actually costs.
How it works
Three steps- 01 — You bring the problem
Ask in plain language
Paste a problem statement or just describe what you're stuck on. No format, no setup, no boilerplate.
› sorted array — return the indices that sum to target - 02 — Levera opens it up
See every approach, ranked
Brute force first, then what improves it, then the optimal — each with complexity, a dry run, and the reasoning that connects them.
brute force → binary search → two pointers · O(n) - 03 — You keep the pattern
Recognize it next time
The solution is the smaller half. What you leave with is the pattern underneath it and the problems it unlocks.
pattern: two pointers · 12 related problems queued
The answer is the easy part. Knowing why it works is what you take into the room.
Levera is built around the reasoning rather than the output. Every response keeps the approach, the trade-off, and the pattern visible — because that is the part that survives past the problem in front of you.
Every approach, not just the winner
You see the brute force next to the optimal, so the trade-off you're making is visible instead of assumed.
The reasoning stays on the surface
Dry runs and complexity sit beside the code, not buried beneath it. Nothing is asserted without being shown.
Patterns outlast problems
Each answer names the pattern it belongs to and links the problems that share it, so solving one earns you many.
Yes. Hint mode starts with a nudge rather than a solution, and every dry run is shown step by step, so you can work up to the answer instead of reading it.
Still deciding? Bring one problem.