Ap Computer Science Elevens Lab Activity 3 Answers Apr 2026

She remembered the lab said: split the deck into two halves, then interleave perfectly, starting with the first half. She wrote a loop, but her cards came out wrong — the last card kept vanishing.

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.

So she closed Discord. Opened her IDE.

Harder. She needed to randomly pick an element from the remaining unshuffled part and swap it with the current position. No ArrayList tricks — just arrays.

Leo sent a thumbs-up. An hour later, he sent his own working code. ap computer science elevens lab activity 3 answers

Maya stared at her screen. Activity 3. The Elevens lab.

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 remembered the lab said: split the deck

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 .

She didn't copy from anyone. But when she ran the tests — all green. It was understanding why the selection shuffle is

Maya almost did. But Mr. Henderson's voice echoed in her head: "If you copy answers, you'll fail the AP exam's free-response questions."

Her friend Leo messaged: "Just post the code."