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 $

Output: "there are

$0.50 $

Explanation:

The words which represent prices are "

$1" and "$

• 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 $

$6 7 8$

$9 $

Output: "1 2

$0.00 4 $

$0.00 7 8$

$0.00 $

Explanation:

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

The words representing prices are "

$3", "$

$6", and "$

Each of them is replaced by "$0.00".

Constraints:

• <code>1 <= sentence.length <= 10⁵</code>

• 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