Scale Recipe Quantities Without Changing Product Descriptions

Scale a one-person recipe for nb_persons people. Each ingredient line begins with a positive integer quantity, followed by one space and a product description. Multiply only the leading quantity; preserve the description and line order.

Function Contract

Implement adjust_quantities(nb_persons, ingredients) -> list[str].

Do not change singular or plural wording. Numbers inside the product description are part of that description and must remain unchanged.

Constraints and Clarifications

The numeric and size bounds below are explicit practice bounds for the stated format.

• 1 <= nb_persons <= 1000000.
• 0 <= len(ingredients) <= 10000.
• Each leading quantity is an ASCII decimal integer from 1 through 1000000.
• The first space separates that quantity from a nonempty product description of at most 200 ASCII characters.
• Preserve every character after that first space, including other digits and spaces.
• Format the multiplied quantity as ordinary decimal digits without unnecessary leading zeros.
• Intermediate products may exceed a signed 32-bit integer.

Examples

nb_persons = 3
ingredients = ["2 eggs", "200 grams of flour", "150 grams of sugar", "1 liter(s) of milk"]
Output: ["6 eggs", "600 grams of flour", "450 grams of sugar", "3 liter(s) of milk"]

nb_persons = 4
ingredients = ["2 packs of 6 rolls", "1 bottle of 2 percent milk"]
Output: ["8 packs of 6 rolls", "4 bottle of 2 percent milk"]