Easy data structure and algorithm practice puzzle.
Given a list of numbers, apply Leaky ReLU to each one. Keep positive numbers as they are, and multiply everything else by 0.01, rounded to 3 decimals. That small slope on the negative side means a neuron that drifts below 0 still gets a little signal, so it can recover instead of going dead.
Solve it three ways: snap the jigsaw pieces together, fill in the blanks, or type it from scratch against the tests. This one is free.
Every line of the solution comes with a note explaining why it is there, and a step by step replay shows the code running. At level 3, where you type it yourself, you can ask for an AI mock interview on this problem that ends with a hiring manager's scorecard.
Then grow it into a real project with the Software Engineer button: this puzzle becomes the Sample Ranking Service, a pipeline you can run and download. See every Software Engineer project.
Browse all 576 puzzles