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How to Solve Reverse Prefix of Word Problem
Master the Reverse Prefix of Word 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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Start Free for WindowsEasy#2000
LeetCode ProblemReverse Prefix of Word
Given a 0-indexed string word and a character ch, reverse the segment of word that starts at index 0 and ends at the index of the first occurrence of ch (inclusive). If the character ch does not exist in word, do nothing. Return the resulting string.
Two PointersStringStack
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Problem Breakdown
Understanding the Reverse Prefix of Word Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a 0-indexed string word and a character ch, reverse the segment of word that starts at index 0 and ends at the index of the first occurrence of ch (inclusive). If the character ch does not exist in word, do nothing. Return the resulting string.
EasyProblem #2000
LeetCodeReverse Prefix of Word
Related Topics
Two PointersStringStack
How Phantom Code Helps
Get real-time assistance for Reverse Prefix of Word problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
word = "abcdefd", ch = "d"
Output
"dcbaefd"
# Example 2
Input
word = "xyxzxe", ch = "z"
Output
"zxyxxe"
# Example 3
Input
word = "abcd", ch = "z"
Output
"abcd"
Constraints
1 <= word.length <= 250
word consists of lowercase English letters.
ch is a lowercase English letter.
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Solve Reverse Prefix of Word — Given a 0-indexed string word and a character ch, reverse the segment of word th...
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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Frequently Asked Questions
Common questions about solving Reverse Prefix of Word and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Reverse Prefix of 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 Reverse Prefix of 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 Reverse Prefix of 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 Reverse Prefix of 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 Reverse Prefix of 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 Reverse Prefix of 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 Reverse Prefix of 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 Reverse Prefix of 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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