Medium data structure and algorithm practice puzzle.
Given two arrays that line up, quantities and prices, return the total value of the stock. Multiply each quantity by the price at the same position, and add everything up. Both arrays have to line up item for item, or the total means nothing.
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 Trade Range Service, a pipeline you can run and download. See every Software Engineer project.
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