151. Reverse Words in a String

Edited by Charles

Medium · Python · String

Problem

Read the original problem on LeetCode.

The official page contains the problem statement, examples, and constraints.

Explanation, examples & other approaches

Core idea

Reference to 344. Reverse String

Original study notes follow, including intermediate snippets and earlier attempts.

Reference to 344. Reverse String

Study record

Field	Value
Attempts	1
Mastery	❚
The Latest Attempt	January 7, 2026

Python solution

class Solution:
    def reverseWords(self, s: str) -> str:
        words = s.split()
        words = words[::-1]
        return ' '.join(words)

        # Alternatively, double pointers
        # n = len(words)
        # left, right = 0, n - 1
        # while left < right:
        #     words[left], words[right] = words[right], words[left]
        #     left += 1
        #     right -= 1

        # return ' '.join(words)

---

Back to Day 8 String II · All Algorithm notes