Medium data structure and algorithm practice puzzle.
Given a list of brightness values that can be any size, squash each one into the range 0 to 1 with c / (1 + c), rounded to 4 decimals. So 1 becomes 0.5 and 9 becomes 0.9. Dark values barely change, and bright ones get pulled in hard, so a scene brighter than your screen can show still looks right.
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 Frame Intake Pipeline, a pipeline you can run and download. See every Software Engineer project.
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