MediumNo. 2288
Apply Discount to Prices — LeetCode 2288 Python Solution
- Pattern
- Hash Map
- Topics
- String
- Reading time
- 2 min
- Source
- leetcode.com
The problem
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.
Example
- 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 "$2".
Python solution
class Solution:
def discountPrices(self, sentence: str, discount: int) -> str:
ans = []
for w in sentence.split():
if w[0] == '$' and w[1:].isdigit():
w = f'${int(w[1:]) * (1 - discount / 100):.2f}'
ans.append(w)
return ' '.join(ans)Complexity
- Time
- O(n)
- Space · auxiliary
- O(n)
Pattern: Hash Map
Trade memory for time: remember what you have seen so the second pass never happens. LeetCode 2288. Apply Discount to Prices is filed here because the reference solution below belongs to the algorithm family this hub collects, even though its LeetCode tags point elsewhere.
The hash map guide has the Python template for the pattern and the 709 LeetCode problems that use it.
Related problems
| No. | Problem | Difficulty |
|---|---|---|
| 2278 | Percentage of Letter in String | Easy |
| 0006 | Zigzag Conversion | Medium |
| 0008 | String to Integer (atoi) | Medium |
| 0038 | Count and Say | Medium |
| 0058 | Length of Last Word | Easy |
| 0065 | Valid Number | Hard |
Frequently asked questions
- How hard is LeetCode 2288. Apply Discount to Prices?
LeetCode 2288. Apply Discount to Prices is rated Medium on LeetCode.
- What is the time complexity of LeetCode 2288. Apply Discount to Prices?
The Python solution on this page runs in O(n).
- What is the space complexity of LeetCode 2288. Apply Discount to Prices?
The Python solution on this page uses O(n) auxiliary space.
- What topics does LeetCode 2288. Apply Discount to Prices cover?
LeetCode 2288. Apply Discount to Prices is tagged String on LeetCode.