Package g2201_2300.s2288_apply_discount_to_prices

Class Solution

  • public class Solution
extends Object
    2288 - Apply Discount to Prices.

    Medium

    A sentence is a string of single-space separated words where each word can contain digits, lowercase letters, and the dollar sign '$'. A word represents a price if it is a sequence of digits preceded by a dollar sign.

    • For example, "$100", "$23", and "$6" represent prices while "100", "$", and "$1e5" do not.

    You are given a string sentence representing a sentence and an integer discount. For each word representing a price, apply a discount of discount% on the price and update the word in the sentence. All updated prices should be represented with exactly two decimal places.

    Return a string representing the modified sentence.

    Note that all prices will contain at most 10 digits.

    Example 1:

    Input: sentence = “there are $1 $2 and 5$ candies in the shop”, discount = 50

    Output: “there are $0.50 $1.00 and 5$ candies in the shop”

    Explanation:

    The words which represent prices are “$1” and “$2”.

    • A 50% discount on “$1” yields “$0.50”, so “$1” is replaced by “$0.50”.

    • A 50% discount on “$2” yields “$1”. Since we need to have exactly 2 decimal places after a price, we replace “$2” with “$1.00”.

    Example 2:

    Input: sentence = “1 2 $3 4 $5 $6 7 8$ $9 $10$”, discount = 100

    Output: “1 2 $0.00 4 $0.00 $0.00 7 8$ $0.00 $10$”

    Explanation:

    Applying a 100% discount on any price will result in 0.

    The words representing prices are “$3”, “$5”, “$6”, and “$9”.

    Each of them is replaced by “$0.00”.

    Constraints:

    • 1 <= sentence.length <= 105
    • sentence consists of lowercase English letters, digits, ' ', and '$'.
    • sentence does not have leading or trailing spaces.
    • All words in sentence are separated by a single space.
    • All prices will be positive numbers without leading zeros.
    • All prices will have at most 10 digits.
    • 0 <= discount <= 100

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • discountPrices

        public String discountPrices​(String sentence,
                             int discount)