Medium data structure and algorithm practice puzzle.
Given a list of amplitudes, scale them so their squares add up to exactly 1, rounded to 4 decimals. Add up the squares, take the square root, and divide every amplitude by it. So [3, 4] becomes [0.6, 0.8]. A real quantum state always has to be normalized like this.
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 Shot Range Service, a pipeline you can run and download. See every Software Engineer project.
Browse all 576 puzzles