Reverse words in a string

Two Pointers String

55.6% acceptance

Jan 12, 2026

10423

5565

Given 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.

Solution

Rust

Time O(1)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn reverse_words(s: String) -> String {
    s.split_whitespace()
      .rev()
      .collect::<Vec<&str>>()
      .join(" ")
  }
}