Medium data structure and algorithm practice puzzle.
Given snapshot times and positions, the current time, and a lag, return where to draw the player, rounded to three decimal places. The moment you draw is now minus lag. Before the first snapshot, use the first position. After the last one, stay at the last position instead of guessing ahead. Otherwise find the two snapshots around that moment and interpolate between them. This puts the last few puzzles together.
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 Reconciler, a pipeline you can run and download. See every Software Engineer project.
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