Question

Given a list of items, the sort column, the sort order (0: ascending, 1: descending), the number of items to be displayed in each page, and a page number, write an algorithm to determine the list of item names in the specified page while respecting the item's order (Page number starts at 0)

Answer 1

Here's an algorithm that you can use to determine the list of item names in a specified page while respecting the item's order:

1. Sort the list of items according to the specified sort column and sort order.
2. Determine the start and end indices for the items in the specified page. To do this, you can use the following formulas:

• start_index = page_number * items_per_page
• end_index = (page_number + 1) * items_per_page - 1

1. Retrieve the list of item names from the sorted list using the start and end indices.
2. Return the list of item names.

Here's some example code in Python that demonstrates how you can implement this algorithm:

def get_page(items, sort_column, sort_order, items_per_page, page_number):

# Sort the list of items according to the specified sort column and sort order

sorted_items = sorted(items, key=lambda x: x[sort_column], reverse=sort_order)

# Determine the start and end indices for the items in the specified page

start_index = page_number * items_per_page

end_index = (page_number + 1) * items_per_page - 1

# Retrieve the list of item names from the sorted list using the start and end indices

item_names = [item[0] for item in sorted_items[start_index:end_index+1]]

# Return the list of item names

return item_names