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 integers without leading zeros.
- All prices will have at most
10
digits. -
0 <= discount <= 100
SOLUTION:
class Solution:
def discountPrices(self, sentence: str, discount: int) -> str:
words = sentence.split()
n = len(words)
for i in range(n):
if words[i][0] == '$' and words[i][1:].isnumeric():
val = words[i][1:]
newprice = eval(f"{val} * (1 - {discount} / 100)")
newprice = "{:.2f}".format(newprice)
words[i] = f"${newprice}"
return " ".join(words)
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