Medium data structure and algorithm practice puzzle.
Given job deadlines, where each job takes one time slot and must finish by its deadline, return the most jobs you can finish. Sort the deadlines from soonest to latest. Walk through them, and take a job whenever you've done fewer jobs so far than its deadline. Handling the urgent jobs first keeps later slots open.
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 Event Budget Allocator, a pipeline you can run and download. See every Software Engineer project.
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