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How to Solve Remove All Adjacent Duplicates in String II Problem
Master the Remove All Adjacent Duplicates in String II LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1209
LeetCode ProblemRemove All Adjacent Duplicates in String II
You are given a string s and an integer k, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing the left and the right side of the deleted substring to concatenate together. We repeatedly make k duplicate removals on s until we no longer can. Return the final string after all such duplicate removals have been made. It is guaranteed that the answer is unique.
StringStack
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Problem Breakdown
Understanding the Remove All Adjacent Duplicates in String II 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, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing the left and the right side of the deleted substring to concatenate together. We repeatedly make k duplicate removals on s until we no longer can. Return the final string after all such duplicate removals have been made. It is guaranteed that the answer is unique.
MediumProblem #1209
LeetCodeRemove All Adjacent Duplicates in String II
Related Topics
StringStack
How Phantom Code Helps
Get real-time assistance for Remove All Adjacent Duplicates in String II problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "abcd", k = 2
Output
"abcd"
# Example 2
Input
s = "deeedbbcccbdaa", k = 3
Output
"aa"
# Example 3
Input
s = "pbbcggttciiippooaais", k = 2
Output
"ps"
Constraints
1 <= s.length <= 105
2 <= k <= 104
s only contains lowercase English letters.
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Solve Remove All Adjacent Duplicates in String II — You are given a string s and an integer k, a k duplicate removal consists of cho...
Here's the optimal approach using String:
def solve(input):
# Optimal O(n) solution
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Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Remove All Adjacent Duplicates in String II and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Remove All Adjacent Duplicates in String 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 Remove All Adjacent Duplicates in String 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 Remove All Adjacent Duplicates in String 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 Remove All Adjacent Duplicates in String 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 Remove All Adjacent Duplicates in String 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 Remove All Adjacent Duplicates in String 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 Remove All Adjacent Duplicates in String 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 Remove All Adjacent Duplicates in String 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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