Easy data structure and algorithm practice puzzle.
Given a list of real amplitudes, return the probability of each outcome, rounded to 4 decimals. By the Born rule, each probability is its amplitude squared. So [0.6, 0.8] gives [0.36, 0.64]. In a valid state, they add up to 1.
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 Retention Curve, a pipeline you can run and download. See every Software Engineer project.
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