EasyNo. 2490
Circular Sentence — LeetCode 2490 Python Solution
- Pattern
- Hash Map
- Topics
- String
- Reading time
- 2 min
- Source
- leetcode.com
The problem
A sentence is a list of words that are separated by a single space with no leading or trailing spaces. For example, "Hello World", "HELLO", "hello world hello world" are all sentences.
Example
- Input
- sentence = "leetcode exercises sound delightful"
- Output
- true
- Explanation
- The words in sentence are ["leetcode", "exercises", "sound", "delightful"].
Python solution
class Solution:
def isCircularSentence(self, sentence: str) -> bool:
ss = sentence.split()
n = len(ss)
return all(s[-1] == ss[(i + 1) % n][0] for i, s in enumerate(ss))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 2490. Circular Sentence 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 |
|---|---|---|
| 2496 | Maximum Value of a String in an Array | 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 2490. Circular Sentence?
LeetCode 2490. Circular Sentence is rated Easy on LeetCode.
- What is the time complexity of LeetCode 2490. Circular Sentence?
The Python solution on this page runs in O(n).
- What is the space complexity of LeetCode 2490. Circular Sentence?
The Python solution on this page uses O(n) auxiliary space.
- What topics does LeetCode 2490. Circular Sentence cover?
LeetCode 2490. Circular Sentence is tagged String on LeetCode.