Python:

def get_keys_on_page(collection, items_per_page, page_number):
start_index = (page_number - 1) * items_per_page
end_index = start_index + items_per_page
return list(collection.keys())[start_index:end_index]

Использование:

my_dict = {1: 'apple', 2: 'banana', 3: 'cherry', 4: 'date', 5: 'elderberry'}
keys_on_page_2 = get_keys_on_page(my_dict, 2, 2)
print(keys_on_page_2)  # Output: [3, 4]

JavaScript:

function getKeysOnPage(collection, itemsPerPage, pageNumber) {
const startIdx = (pageNumber - 1) * itemsPerPage;
const endIdx = startIdx + itemsPerPage;
return Object.keys(collection).slice(startIdx, endIdx);
}

Использование:

const myObj = {1: 'apple', 2: 'banana', 3: 'cherry', 4: 'date', 5: 'elderberry'};
const keysOnPage2 = getKeysOnPage(myObj, 2, 2);
console.log(keysOnPage2);  // Output: ['3', '4']

Java:

import java.util.HashMap;
import java.util.List;
import java.util.stream.Collectors;
public class PageKeysExtractor {
public static List<Integer> getKeysOnPage(HashMap<Integer, String> collection, int itemsPerPage, int pageNumber) {
    int startIdx = (pageNumber - 1) * itemsPerPage;
    int endIdx = Math.min(startIdx + itemsPerPage, collection.size());
    return collection.keySet().stream()
            .skip(startIdx)
            .limit(endIdx - startIdx)
            .collect(Collectors.toList());
}
}

Использование:

import java.util.HashMap;
import java.util.List;
public class Main {
public static void main(String[] args) {
    HashMap<Integer, String> myMap = new HashMap<>();
    myMap.put(1, "apple");
    myMap.put(2, "banana");
    myMap.put(3, "cherry");
    myMap.put(4, "date");
    myMap.put(5, "elderberry");
    List<Integer> keysOnPage2 = PageKeysExtractor.getKeysOnPage(myMap, 2, 2);
    System.out.println(keysOnPage2);  // Output: [3, 4]
}
}