Medium data structure and algorithm practice puzzle.
Given the dimension of each quantum system, return the dimension of all of them combined. Combining systems multiplies their dimensions, so start at 1 and multiply by each one. Two qubits give 2 x 2 = 4. That's the tensor product, and it's why quantum state spaces grow so fast.
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 Ledger Balancer, a pipeline you can run and download. See every Software Engineer project.
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