Easy data structure and algorithm practice puzzle.
Given a list of numbers, return the INDEX of the biggest one, not the value. If two tie, return the first. Walk the list once and keep the index of the best so far. When a network gives you a score per class, the argmax is its predicted class.
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 Stream Buffer, a pipeline you can run and download. See every Software Engineer project.
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