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How to Solve Most Common Word Problem
Master the Most Common Word LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsEasy#819
LeetCode ProblemMost Common Word
Given a string paragraph and a string array of the banned words banned, return the most frequent word that is not banned. It is guaranteed there is at least one word that is not banned, and that the answer is unique. The words in paragraph are case-insensitive and the answer should be returned in lowercase. Note that words can not contain punctuation symbols.
ArrayHash TableStringCounting
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Problem Breakdown
Understanding the Most Common Word Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a string paragraph and a string array of the banned words banned, return the most frequent word that is not banned. It is guaranteed there is at least one word that is not banned, and that the answer is unique. The words in paragraph are case-insensitive and the answer should be returned in lowercase. Note that words can not contain punctuation symbols.
EasyProblem #819
LeetCodeMost Common Word
Related Topics
ArrayHash TableStringCounting
How Phantom Code Helps
Get real-time assistance for Most Common Word problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
paragraph = "Bob hit a ball, the hit BALL flew far after it was hit.", banned = ["hit"]
Output
"ball"
# Example 2
Input
paragraph = "a.", banned = []
Output
"a"
Constraints
1 <= paragraph.length <= 1000
paragraph consists of English letters, space ' ', or one of the symbols: "!?',;.".
0 <= banned.length <= 100
1 <= banned[i].length <= 10
banned[i] consists of only lowercase English letters.
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Solve Most Common Word — Given a string paragraph and a string array of the banned words banned, return t...
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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We work with Zoom, HackerRank, CodeSignal, CoderPad and other web-based platforms. Check the compatibility note and request a browser link if a specific desktop app is unsupported.
Frequently Asked Questions
Common questions about solving Most Common Word and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Most Common Word 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 Most Common Word?
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 Most Common Word?
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 Most Common Word 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 Most Common Word 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 Most Common Word 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 Most Common Word 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 Most Common Word 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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