AlgoTrail

Understand LeetCode problems: plain-English explanations, hints, complexity, a step-by-step visualizer and whiteboard.

AlgoTrail is a Chrome extension that helps you learn to solve LeetCode problems yourself. It opens beside the problem you're working on and guides your thinking without giving away the answer. UNDERSTAND THE PROBLEM Get a plain-English explanation, a small worked example and the one detail that's easiest to miss. GET HINTS WITHOUT SPOILERS See which topics apply, each with a guiding question. The full approach stays hidden until you choose to reveal it. WATCH YOUR CODE RUN Step through your solution line by line and see exactly what it does. AlgoTrail draws trees, linked lists, graphs, stacks, queues, heaps, hash maps, sets, grids and arrays as they change, and explains each step in plain words. Stuck on a step? Ask about it. CHECK YOUR COMPLEXITY See the time and space complexity of your code, compared with the best possible for the problem. THINK IT THROUGH ON A WHITEBOARD Sketch trees, arrays and notes right next to the problem. Each problem keeps its own board, saved in your browser.