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How to Solve Keyboard Row Problem
Master the Keyboard Row LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
Phantom Code generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.
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LeetCode ProblemKeyboard Row
Given an array of strings words, return the words that can be typed using letters of the alphabet on only one row of American keyboard like the image below. Note that the strings are case-insensitive, both lowercased and uppercased of the same letter are treated as if they are at the same row. In the American keyboard:
ArrayHash TableString
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Problem Breakdown
Understanding the Keyboard Row Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given an array of strings words, return the words that can be typed using letters of the alphabet on only one row of American keyboard like the image below. Note that the strings are case-insensitive, both lowercased and uppercased of the same letter are treated as if they are at the same row. In the American keyboard:
EasyProblem #500
LeetCodeKeyboard Row
Related Topics
ArrayHash TableString
How Phantom Code Helps
Get real-time assistance for Keyboard Row problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
words = ["Hello","Alaska","Dad","Peace"]
Output
["Alaska","Dad"]
# Example 2
Input
words = ["omk"]
Output
[]
# Example 3
Input
words = ["adsdf","sfd"]
Output
["adsdf","sfd"]
Constraints
1 <= words.length <= 20
1 <= words[i].length <= 100
words[i] consists of English letters (both lowercase and uppercase).
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Solve Keyboard Row — Given an array of strings words, return the words that can be typed using letter...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Keyboard Row and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Keyboard Row 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 Keyboard Row?
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 Keyboard Row?
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 Keyboard Row 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 Keyboard Row 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 Keyboard Row 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 Keyboard Row 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 Keyboard Row 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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