Easy data structure and algorithm practice puzzle.
Given an array of campaign profits, return the INDEX of the most profitable one, not the profit itself. Walk the array once and remember the index of the best value so far. If two tie, keep the first one. You'll want the index whenever you need to look something up in another list that lines up with this one.
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 Order Anomaly Watch, a pipeline you can run and download. See every Software Engineer project.
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