Ap Computer Science Elevens Lab Activity 3 Answers Apr 2026

Her first attempt shuffled the same card twice. Then she realized: loop k from 0 to length-1, pick random index between k and length-1, swap deck[k] with deck[random] .

She wrote it. Ran it. The randomness looked good — no repeats. ap computer science elevens lab activity 3 answers

She messaged Leo back: "Not giving answers. But hint: trace the loops with a mini deck of 4 cards on paper first. Then code writes itself." Her first attempt shuffled the same card twice

Activity 3's secret wasn't just code. It was understanding why the selection shuffle is better than perfect shuffle for real games (perfect shuffle is deterministic and can be reversed). She added a comment in her code explaining that. Ran it

She'd survived Shuffling (Activity 1) and the Card and Deck classes (Activity 2). Now, Activity 3 wanted her to implement Shuffler.java — specifically, the and the efficient selection shuffle .