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How to Solve Peaks in Array Problem
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Start Free for WindowsHard#3187
LeetCode ProblemPeaks in Array
A peak in an array arr is an element that is greater than its previous and next element in arr. You are given an integer array nums and a 2D integer array queries. You have to process queries of two types: Return an array answer containing the results of the queries of the first type in order. Notes:
ArrayBinary Indexed TreeSegment Tree
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Problem Breakdown
Understanding the Peaks in Array Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
A peak in an array arr is an element that is greater than its previous and next element in arr. You are given an integer array nums and a 2D integer array queries. You have to process queries of two types: Return an array answer containing the results of the queries of the first type in order. Notes:
HardProblem #3187
LeetCodePeaks in Array
Related Topics
ArrayBinary Indexed TreeSegment Tree
How Phantom Code Helps
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Examples
# Example 1
Input
nums = [3,1,4,2,5], queries = [[2,3,4],[1,0,4]]
Output
[0]
# Example 2
Input
nums = [4,1,4,2,1,5], queries = [[2,2,4],[1,0,2],[1,0,4]]
Output
[0,1]
Constraints
3 <= nums.length <= 105
1 <= nums[i] <= 105
1 <= queries.length <= 105
queries[i][0] == 1 or queries[i][0] == 2
For all i that:
queries[i][0] == 1: 0 <= queries[i][1] <= queries[i][2] <= nums.length - 1
queries[i][0] == 2: 0 <= queries[i][1] <= nums.length - 1, 1 <= queries[i][2] <= 105
queries[i][0] == 1: 0 <= queries[i][1] <= queries[i][2] <= nums.length - 1
queries[i][0] == 2: 0 <= queries[i][1] <= nums.length - 1, 1 <= queries[i][2] <= 105
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Solve Peaks in Array — A peak in an array arr is an element that is greater than its previous and next ...
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 Peaks in Array and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Peaks in Array 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 Peaks in Array?
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 Peaks in Array?
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 Peaks in Array 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 Peaks in Array 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 Peaks in Array 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 Peaks in Array 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 Peaks in Array 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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