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How to Solve Build an Array With Stack Operations Problem
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Medium#1441
LeetCode ProblemBuild an Array With Stack Operations
You are given an integer array target and an integer n. You have an empty stack with the two following operations: You also have a stream of the integers in the range [1, n]. Use the two stack operations to make the numbers in the stack (from the bottom to the top) equal to target. You should follow the following rules: Return the stack operations needed to build target following the mentioned rules. If there are multiple valid answers, return any of them.
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Problem Breakdown
Understanding the Build an Array With Stack Operations Problem
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Problem Statement
You are given an integer array target and an integer n. You have an empty stack with the two following operations: You also have a stream of the integers in the range [1, n]. Use the two stack operations to make the numbers in the stack (from the bottom to the top) equal to target. You should follow the following rules: Return the stack operations needed to build target following the mentioned rules. If there are multiple valid answers, return any of them.
MediumProblem #1441
LeetCodeBuild an Array With Stack Operations
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How PhantomCodeAI Helps
Get real-time assistance for Build an Array With Stack Operations problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.
Examples
# Example 1
Input
target = [1,3], n = 3
Output
["Push","Push","Pop","Push"]
# Example 2
Input
target = [1,2,3], n = 3
Output
["Push","Push","Push"]
# Example 3
Input
target = [1,2], n = 4
Output
["Push","Push"]
Constraints
1 <= target.length <= 100
1 <= n <= 100
1 <= target[i] <= n
target is strictly increasing.
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Solve Build an Array With Stack Operations — You are given an integer array target and an integer n. You have an empty stack ...
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 Build an Array With Stack Operations and using PhantomCodeAI during coding interviews.
How does PhantomCodeAI help me solve coding problems like Build an Array With Stack Operations during interviews?
PhantomCodeAI 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 Build an Array With Stack Operations?
PhantomCodeAI 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 PhantomCodeAI help me communicate my solution for problems like Build an Array With Stack Operations?
Yes. PhantomCodeAI 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 PhantomCodeAI assist with different programming languages for Build an Array With Stack Operations type problems?
PhantomCodeAI 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 PhantomCodeAI help me avoid during Build an Array With Stack Operations interviews?
PhantomCodeAI 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 PhantomCodeAI detectable when solving problems like Build an Array With Stack Operations during live interviews?
No. PhantomCodeAI 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 PhantomCodeAI help when I'm struggling with Build an Array With Stack Operations 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 PhantomCodeAI work for the coding platforms used in Build an Array With Stack Operations interviews?
Yes. PhantomCodeAI works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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