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HomeLeetCode ProblemsCan Make Palindrome from Substring
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How to Solve Can Make Palindrome from Substring Problem

Master the Can Make Palindrome from Substring LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

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Medium#1177
LeetCode Problem

Can Make Palindrome from Substring

You are given a string s and array queries where queries[i] = [lefti, righti, ki]. We may rearrange the substring s[lefti...righti] for each query and then choose up to ki of them to replace with any lowercase English letter. If the substring is possible to be a palindrome string after the operations above, the result of the query is true. Otherwise, the result is false. Return a boolean array answer where answer[i] is the result of the ith query queries[i]. Note that each letter is counted individually for replacement, so if, for example s[lefti...righti] = "aaa", and ki = 2, we can only replace two of the letters. Also, note that no query modifies the initial string s. Example :

ArrayHash TableStringBit ManipulationPrefix Sum

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Problem Breakdown

Understanding the Can Make Palindrome from Substring 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 array queries where queries[i] = [lefti, righti, ki]. We may rearrange the substring s[lefti...righti] for each query and then choose up to ki of them to replace with any lowercase English letter. If the substring is possible to be a palindrome string after the operations above, the result of the query is true. Otherwise, the result is false. Return a boolean array answer where answer[i] is the result of the ith query queries[i]. Note that each letter is counted individually for replacement, so if, for example s[lefti...righti] = "aaa", and ki = 2, we can only replace two of the letters. Also, note that no query modifies the initial string s. Example :

MediumProblem #1177
LeetCode

Can Make Palindrome from Substring

Related Topics

ArrayHash TableStringBit ManipulationPrefix Sum

How PhantomCodeAI Helps

Get real-time assistance for Can Make Palindrome from Substring problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.

Examples

# Example 1

Input
s = "abcda", queries = [[3,3,0],[1,2,0],[0,3,1],[0,3,2],[0,4,1]]
Output
[true,false,false,true,true]

# Example 2

Input
s = "lyb", queries = [[0,1,0],[2,2,1]]
Output
[false,true]

Constraints

1 <= s.length, queries.length <= 105
0 <= lefti <= righti < s.length
0 <= ki <= s.length
s consists of lowercase English letters.

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Solve Can Make Palindrome from Substring — You are given a string s and array queries where queries[i] = [lefti, righti, ki...

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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Undetectability Checklist

Run compatibility test before interviews
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Thousands of developers use PhantomCodeAI. Social proof signals that this approach helps real candidates land offers across a range of companies.

Undetectability and technical details

Our native desktop architecture avoids common detection vectors used by browser extensions. We provide a clear checklist so you can run basic checks and confirm the app will be invisible.

Platform compatibility and limitations

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 Can Make Palindrome from Substring and using PhantomCodeAI during coding interviews.

How does PhantomCodeAI help with LeetCode problems during a coding interview?
PhantomCodeAI reads the problem from a screenshot or listens to it via audio, then generates a complete solution with a step-by-step approach and time/space complexity, so you can focus on explaining your reasoning rather than getting stuck on implementation.
Which programming languages does PhantomCodeAI support?
11 languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set a preferred language to get idiomatic solutions.
Does PhantomCodeAI work with HackerRank, CodeSignal, and CoderPad?
Yes — it works alongside LeetCode, HackerRank, CodeSignal, CoderPad, and HackerEarth, plus any browser-based coding environment.
Can PhantomCodeAI handle follow-up questions and modifications?
Yes. Capture the modified problem by screenshot or audio and get an updated solution within seconds, including new edge cases and optimizations.
Is PhantomCodeAI detectable during live interviews?
PhantomCodeAI runs as a native desktop overlay that does not appear in screen shares, recordings, or proctoring software, and works with Zoom, Google Meet, Microsoft Teams, and major coding platforms.
Should I still practice these problems on my own first?
Yes. The most durable preparation is solving problems unaided first, then using AI afterward to review your approach, complexity, and missed edge cases — use it to debrief and learn, not to skip the reps.

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