A workspace for curious programmers
A little clarity.
A better algorithm.
From your first idea to the final submission. Write C++, test your thinking, and understand how your code grows.
No setup. No account required. Just start building.
solution.cppC++17
01// Find the answer. Skip the noise.
02int binary_search(int target) {
03 int lo = 0, hi = n - 1;
04 while (lo <= hi) {
05 int mid = lo + (hi - lo) / 2;
06 if (a[mid] == target) return mid;
07 if (a[mid] < target) lo = mid + 1;
08 else hi = mid - 1;
09 }
10 return -1;
11}Time complexityO(log n)
Half the search.
Every step.
Every step.
Built for the way you solve.C++17Browser executionTime + space analysisLocal-first files
01 / Your toolkit
Less friction.
More figuring it out.
Everything you need to explore a solution,
with room to focus on what matters.
01 — Playground
Start coding
Your next idea starts here.
A focused C++ editor with input, output, and a compiler running in your browser.
02 — Analyzer
Understand the complexity
Know what your code costs.
Explore time and auxiliary space estimates, with the patterns behind the result.
03 — Workspace
Browse your files
Keep your thinking together.
Save solutions locally. Find them quickly. Export your work whenever you need it.
02 / A sense of scale
Small input.
Big difference.
Two solutions can feel equally fast. Then the input grows. Move the slider to see why complexity matters.
Illustrative operation counts, not benchmarks. Both chart axes use a logarithmic scale.
operations / input sizeInteractive
O(log n)10
O(n)1K
O(n log n)10K
O(n²)1M