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[11/13] 151. Reverse Words in a String
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Medium
49634399Add to ListShareGiven an input string s, reverse the order of the words.
A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space.
Return a string of the words in reverse order concatenated by a single space.
Note that s may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.
Example 1:
Input: s = "the sky is blue" Output: "blue is sky the"
Example 2:
Input: s = " hello world " Output: "world hello" Explanation: Your reversed string should not contain leading or trailing spaces.
Example 3:
Input: s = "a good example" Output: "example good a" Explanation: You need to reduce multiple spaces between two words to a single space in the reversed string.
Constraints:
1 <= s.length <= 104scontains English letters (upper-case and lower-case), digits, and spaces' '.- There is at least one word in
s.
Follow-up: If the string data type is mutable in your language, can you solve it in-place with O(1) extra space?
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Runtime: 55 ms, faster than 67.47% of Python3 online submissions for Reverse Words in a String.
Memory Usage: 14 MB, less than 48.37% of Python3 online submissions for Reverse Words in a String.
Memory Usage: 14 MB, less than 48.37% of Python3 online submissions for Reverse Words in a String.
class Solution:
def reverseWords(self, s: str) -> str:
return " ".join(reversed(s.split()))
