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How to Solve Find Maximum Removals From Source String Problem
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Medium#3316
LeetCode ProblemFind Maximum Removals From Source String
You are given a string source of size n, a string pattern that is a subsequence of source, and a sorted integer array targetIndices that contains distinct numbers in the range [0, n - 1]. We define an operation as removing a character at an index idx from source such that: Performing an operation does not change the indices of the other characters in source. For example, if you remove 'c' from "acb", the character at index 2 would still be 'b'. Return the maximum number of operations that can be performed.
ArrayHash TableTwo PointersStringDynamic Programming
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Problem Breakdown
Understanding the Find Maximum Removals From Source String Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a string source of size n, a string pattern that is a subsequence of source, and a sorted integer array targetIndices that contains distinct numbers in the range [0, n - 1]. We define an operation as removing a character at an index idx from source such that: Performing an operation does not change the indices of the other characters in source. For example, if you remove 'c' from "acb", the character at index 2 would still be 'b'. Return the maximum number of operations that can be performed.
MediumProblem #3316
LeetCodeFind Maximum Removals From Source String
Related Topics
ArrayHash TableTwo PointersStringDynamic Programming
How Phantom Code AI Helps
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Examples
# Example 1
Input
source = "abbaa", pattern = "aba", targetIndices = [0,1,2]
Output
1
# Example 2
Input
source = "bcda", pattern = "d", targetIndices = [0,3]
Output
2
# Example 3
Input
source = "dda", pattern = "dda", targetIndices = [0,1,2]
Output
0
# Example 4
Input
source = "yeyeykyded" , pattern = "yeyyd" , targetIndices = [0,2,3,4]
Output
2
Constraints
1 <= n == source.length <= 3 * 103
1 <= pattern.length <= n
1 <= targetIndices.length <= n
targetIndices is sorted in ascending order.
The input is generated such that targetIndices contains distinct elements in the range [0, n - 1].
source and pattern consist only of lowercase English letters.
The input is generated such that pattern appears as a subsequence in source.
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Solve Find Maximum Removals From Source String — You are given a string source of size n, a string pattern that is a subsequence ...
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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Frequently Asked Questions
Common questions about solving Find Maximum Removals From Source String and using Phantom Code AI during coding interviews.
How does Phantom Code AI help me solve coding problems like Find Maximum Removals From Source String during interviews?
Phantom Code AI 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 Find Maximum Removals From Source String?
Phantom Code AI 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 AI help me communicate my solution for problems like Find Maximum Removals From Source String?
Yes. Phantom Code AI 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 AI assist with different programming languages for Find Maximum Removals From Source String type problems?
Phantom Code AI 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 AI help me avoid during Find Maximum Removals From Source String interviews?
Phantom Code AI 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 AI detectable when solving problems like Find Maximum Removals From Source String during live interviews?
No. Phantom Code AI 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 AI help when I'm struggling with Find Maximum Removals From Source String 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 AI work for the coding platforms used in Find Maximum Removals From Source String interviews?
Yes. Phantom Code AI works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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