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How to Solve Find Substring With Given Hash Value Problem
Master the Find Substring With Given Hash Value LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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LeetCode ProblemFind Substring With Given Hash Value
The hash of a 0-indexed string s of length k, given integers p and m, is computed using the following function: Where val(s[i]) represents the index of s[i] in the alphabet from val('a') = 1 to val('z') = 26. You are given a string s and the integers power, modulo, k, and hashValue. Return sub, the first substring of s of length k such that hash(sub, power, modulo) == hashValue. The test cases will be generated such that an answer always exists. A substring is a contiguous non-empty sequence of characters within a string.
StringSliding WindowRolling HashHash Function
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Problem Breakdown
Understanding the Find Substring With Given Hash Value Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
The hash of a 0-indexed string s of length k, given integers p and m, is computed using the following function: Where val(s[i]) represents the index of s[i] in the alphabet from val('a') = 1 to val('z') = 26. You are given a string s and the integers power, modulo, k, and hashValue. Return sub, the first substring of s of length k such that hash(sub, power, modulo) == hashValue. The test cases will be generated such that an answer always exists. A substring is a contiguous non-empty sequence of characters within a string.
HardProblem #2156
LeetCodeFind Substring With Given Hash Value
Related Topics
StringSliding WindowRolling HashHash Function
How Phantom Code Helps
Get real-time assistance for Find Substring With Given Hash Value problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "leetcode", power = 7, modulo = 20, k = 2, hashValue = 0
Output
"ee"
# Example 2
Input
s = "fbxzaad", power = 31, modulo = 100, k = 3, hashValue = 32
Output
"fbx"
Constraints
1 <= k <= s.length <= 2 * 104
1 <= power, modulo <= 109
0 <= hashValue < modulo
s consists of lowercase English letters only.
The test cases are generated such that an answer always exists.
How Phantom Code Helps with LeetCode Problems
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Solve Find Substring With Given Hash Value — The hash of a 0-indexed string s of length k, given integers p and m, is compute...
Here's the optimal approach using String:
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 Substring With Given Hash Value and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Find Substring With Given Hash Value 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 Find Substring With Given Hash Value?
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 Find Substring With Given Hash Value?
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 Find Substring With Given Hash Value 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 Find Substring With Given Hash Value 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 Find Substring With Given Hash Value 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 Find Substring With Given Hash Value 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 Find Substring With Given Hash Value 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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