BUILDREALINTUITIONfor algorithms
A loud, hands-on workspace to build a rock-solid foundation in problem solving — before you step into the world of Data Structures & Algorithms.
Two Sum
Given an array of integers, return the indices of the two numbers that add up to a specific target.
function twoSum(nums, target) {
const seen = new Map();
for (let i = 0; i < nums.length; i++) {
const need = target - nums[i];
if (seen.has(need))
return [seen.get(need), i];
seen.set(nums[i], i);
}
}A workspace with personality
AI Approach Review
Sketch your idea in the scratchpad and get instant, blunt feedback on your reasoning — before you write a single line of code.
In-browser editor
A real Monaco editor with run + submit. No setup, no context switching.
Progress that compounds
A streak heatmap and per-topic mastery so you always know what to sharpen next.
Instant feedback loops
Run against test cases and submit in one click. Tight loops turn practice into intuition.
- Run test cases
- One-click submit
- Results inline
Three steps, then it's just reps
Pick a problem
Curated sets that build from fundamentals to fluency.
Reason it out
Sketch your approach and get AI feedback before you code.
Solve & submit
Write, run, submit — then watch your streak grow.
READY TO THINK IN ALGORITHMS?
Start with the fundamentals and code your way to mastery — one deliberate problem at a time.