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How to Solve Smallest Palindromic Rearrangement II Problem
Master the Smallest Palindromic Rearrangement II LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#3518
LeetCode ProblemSmallest Palindromic Rearrangement II
You are given a palindromic string s and an integer k. Return the k-th lexicographically smallest palindromic permutation of s. If there are fewer than k distinct palindromic permutations, return an empty string. Note: Different rearrangements that yield the same palindromic string are considered identical and are counted once.
Hash TableMathStringCombinatoricsCounting
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Problem Breakdown
Understanding the Smallest Palindromic Rearrangement II Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a palindromic string s and an integer k. Return the k-th lexicographically smallest palindromic permutation of s. If there are fewer than k distinct palindromic permutations, return an empty string. Note: Different rearrangements that yield the same palindromic string are considered identical and are counted once.
HardProblem #3518
LeetCodeSmallest Palindromic Rearrangement II
Related Topics
Hash TableMathStringCombinatoricsCounting
How Phantom Code Helps
Get real-time assistance for Smallest Palindromic Rearrangement II problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "abba", k = 2
Output
"baab"
# Example 2
Input
s = "aa", k = 2
Output
""
# Example 3
Input
s = "bacab", k = 1
Output
"abcba"
Constraints
1 <= s.length <= 104
s consists of lowercase English letters.
s is guaranteed to be palindromic.
1 <= k <= 106
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Solve Smallest Palindromic Rearrangement II — You are given a palindromic string s and an integer k. Return the k-th lexicogra...
Here's the optimal approach using Hash Table:
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 Smallest Palindromic Rearrangement II and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Smallest Palindromic Rearrangement II 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 Smallest Palindromic Rearrangement II?
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 Smallest Palindromic Rearrangement II?
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 Smallest Palindromic Rearrangement II 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 Smallest Palindromic Rearrangement II 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 Smallest Palindromic Rearrangement II 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 Smallest Palindromic Rearrangement II 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 Smallest Palindromic Rearrangement II 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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