2288. Apply Discount to Prices

Medium

159

1K

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 = 50Output:"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 = 100Output:"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 <= 10`

^{5}`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`

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