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`