Reverse Words in a String

Category

Array / String

Checkbox

Difficulty

Medium

Index

Key Ideas

The key idea to solve the problem is to reverse the individual words in the given string by utilizing two pointers and in-place string manipulation.

Problem Number

151

Problem Summary

Given a string, reverse the order of the words in the string while preserving the order of the characters within each word. Some key pitfalls to consider when solving this problem are handling leading/trailing spaces, multiple consecutive spaces between words, and the need to reverse words in-place without using extra space.

Solution Summary

The best solution to the "Reverse Words in a String" problem is to use a two-pointer approach. First, remove any leading or trailing white spaces from the given string. Then, initialize two pointers, one at the start of the string and the other at the end. Iterate through the string using the end pointer and find the start and end indices of each word. Reverse each word using a helper function and append it to a result string. Finally, return the result string with the reversed words. This solution has a time complexity of O(n), where n is the length of the input string.