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How to Solve Sum of Largest Prime Substrings Problem
Master the Sum of Largest Prime Substrings LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#3556
LeetCode ProblemSum of Largest Prime Substrings
Given a string s, find the sum of the 3 largest unique prime numbers that can be formed using any of its substrings. Return the sum of the three largest unique prime numbers that can be formed. If fewer than three exist, return the sum of all available primes. If no prime numbers can be formed, return 0. Note: Each prime number should be counted only once, even if it appears in multiple substrings. Additionally, when converting a substring to an integer, any leading zeros are ignored.
Hash TableMathStringSortingNumber Theory
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Problem Breakdown
Understanding the Sum of Largest Prime Substrings Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a string s, find the sum of the 3 largest unique prime numbers that can be formed using any of its substrings. Return the sum of the three largest unique prime numbers that can be formed. If fewer than three exist, return the sum of all available primes. If no prime numbers can be formed, return 0. Note: Each prime number should be counted only once, even if it appears in multiple substrings. Additionally, when converting a substring to an integer, any leading zeros are ignored.
MediumProblem #3556
LeetCodeSum of Largest Prime Substrings
Related Topics
Hash TableMathStringSortingNumber Theory
How Phantom Code Helps
Get real-time assistance for Sum of Largest Prime Substrings problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "12234"
Output
1469
# Example 2
Input
s = "111"
Output
11
Constraints
1 <= s.length <= 10
s consists of only digits.
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Solve Sum of Largest Prime Substrings — Given a string s, find the sum of the 3 largest unique prime numbers that can be...
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 Sum of Largest Prime Substrings and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Sum of Largest Prime Substrings 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 Sum of Largest Prime Substrings?
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 Sum of Largest Prime Substrings?
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 Sum of Largest Prime Substrings 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 Sum of Largest Prime Substrings 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 Sum of Largest Prime Substrings 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 Sum of Largest Prime Substrings 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 Sum of Largest Prime Substrings 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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