Coding Problems

Count how many patients fall into age groups: Child (<18), Adult (18-65), Senior (>65).

Find the user who sent the most messages.

Group messages by sender in a dictionary.

Given a list of messages, count the total number sent.

Sort a list of posts by the number of likes in descending order.

Filter products within a given price range.

Given a product category, suggest similar products from a dictionary.

Given a list of products, return the cheapest one.

Apply a discount percentage to the total cart value.

Given a list of products with prices, calculate the total cart value.