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August 28, 2025 19:03
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Spell
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| import java.util.ArrayList; | |
| import java.util.Arrays; | |
| import java.util.List; | |
| /** | |
| * In the echanted land of Evenaria, | |
| * an elf named Codelia was searching for the mystical Even Stones, which maintained balance and harmony. | |
| * One day, she discovered an ancient scroll with a list of numbers representing their locations. | |
| * However, the scroll was damaged and the numbers looked scrambled. | |
| * <p> | |
| * Codelia sought the wise counsel of an old owl, | |
| * who advised her to reserve the list and keep only even numbers to unveil the original sequence of the stones. | |
| * Now, it's up to you to help Codelia decipher the ancient scroll by writing a spell that performs this operation. | |
| */ | |
| public class Spell { | |
| /** | |
| * @param numbers A list of integers | |
| * @return The reversed list with only even numbers | |
| */ | |
| public static List<Integer> spell(List<Integer> numbers) { | |
| List<Integer> results = new ArrayList<>(); | |
| for (int idx = numbers.size() - 1; idx >= 0; idx--) { | |
| int current = numbers.get(idx); | |
| if (current % 2 == 0) { | |
| results.add(current); | |
| } | |
| } | |
| return results; | |
| } | |
| public static void main(String[] args) { | |
| int[] values = new int[]{4, 2, 28, 19, 44, 32, 18, 26, 2, 13}; | |
| System.out.println("Using example: " + spell(Arrays.stream(values).collect(ArrayList::new, ArrayList::add, ArrayList::addAll))); | |
| } | |
| } |
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