Medium data structure and algorithm practice puzzle.
Given a qubit's angle theta on the Bloch sphere, in degrees, return the chance of measuring 0, rounded to 4 decimals. Convert theta to radians, then the answer is cos(theta / 2) squared. So 0 degrees gives 1, 90 gives 0.5, and 180 gives 0.
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 Stats Roll-up, a pipeline you can run and download. See every Software Engineer project.
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