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How to Solve Longest Palindromic Subsequence After at Most K Operations Problem
Master the Longest Palindromic Subsequence After at Most K Operations LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#3472
LeetCode ProblemLongest Palindromic Subsequence After at Most K Operations
You are given a string s and an integer k. In one operation, you can replace the character at any position with the next or previous letter in the alphabet (wrapping around so that 'a' is after 'z'). For example, replacing 'a' with the next letter results in 'b', and replacing 'a' with the previous letter results in 'z'. Similarly, replacing 'z' with the next letter results in 'a', and replacing 'z' with the previous letter results in 'y'. Return the length of the longest palindromic subsequence of s that can be obtained after performing at most k operations.
StringDynamic Programming
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Problem Breakdown
Understanding the Longest Palindromic Subsequence After at Most K Operations Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a string s and an integer k. In one operation, you can replace the character at any position with the next or previous letter in the alphabet (wrapping around so that 'a' is after 'z'). For example, replacing 'a' with the next letter results in 'b', and replacing 'a' with the previous letter results in 'z'. Similarly, replacing 'z' with the next letter results in 'a', and replacing 'z' with the previous letter results in 'y'. Return the length of the longest palindromic subsequence of s that can be obtained after performing at most k operations.
MediumProblem #3472
LeetCodeLongest Palindromic Subsequence After at Most K Operations
Related Topics
StringDynamic Programming
How Phantom Code Helps
Get real-time assistance for Longest Palindromic Subsequence After at Most K Operations problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "abced", k = 2
Output
3
# Example 2
Input
s = " aaazzz ", k = 4
Output
6
Constraints
1 <= s.length <= 200
1 <= k <= 200
s consists of only lowercase English letters.
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Solve Longest Palindromic Subsequence After at Most K Operations — You are given a string s and an integer k. In one operation, you can replace the...
Here's the optimal approach using String:
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 Longest Palindromic Subsequence After at Most K Operations and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Longest Palindromic Subsequence After at Most K Operations 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 Longest Palindromic Subsequence After at Most K Operations?
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 Longest Palindromic Subsequence After at Most K Operations?
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 Longest Palindromic Subsequence After at Most K Operations 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 Longest Palindromic Subsequence After at Most K Operations 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 Longest Palindromic Subsequence After at Most K Operations 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 Longest Palindromic Subsequence After at Most K Operations 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 Longest Palindromic Subsequence After at Most K Operations 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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