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How to Solve Reverse Words in a String Problem
Master the Reverse Words in a String LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#151
LeetCode ProblemReverse Words in a String
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. Example 1: Example 2: Example 3: Constraints: Follow-up: If the string data type is mutable in your language, can you solve it in-place with O(1) extra space?
Two PointersString
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Problem Breakdown
Understanding the Reverse Words in a String Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
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. Example 1: Example 2: Example 3: Constraints: Follow-up: If the string data type is mutable in your language, can you solve it in-place with O(1) extra space?
MediumProblem #151
LeetCodeReverse Words in a String
Related Topics
Two PointersString
How Phantom Code Helps
Get real-time assistance for Reverse Words in a String problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "the sky is blue"
Output
"blue is sky the"
# Example 2
Input
s = " hello world "
Output
"world hello"
# Example 3
Input
s = "a good example"
Output
"example good a"
Constraints
1 <= s.length <= 104
s contains English letters (upper-case and lower-case), digits, and spaces ' '.
There is at least one word in s.
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Solve Reverse Words in a String — Given an input string s, reverse the order of the words. A word is defined as a ...
Here's the optimal approach using Two Pointers:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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HackerRank
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Frequently Asked Questions
Common questions about solving Reverse Words in a String and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Reverse Words in a String during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Reverse Words in a String?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Reverse Words in a String?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Reverse Words in a String type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Reverse Words in a String interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Reverse Words in a String during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Reverse Words in a String style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Reverse Words in a String interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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