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How to Solve Parse Lisp Expression Problem
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Hard#736
LeetCode ProblemParse Lisp Expression
You are given a string expression representing a Lisp-like expression to return the integer value of. The syntax for these expressions is given as follows.
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Problem Breakdown
Understanding the Parse Lisp Expression Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a string expression representing a Lisp-like expression to return the integer value of. The syntax for these expressions is given as follows.
HardProblem #736
LeetCodeParse Lisp Expression
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How PhantomCodeAI Helps
Get real-time assistance for Parse Lisp Expression problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.
Examples
# Example 1
Input
expression = "(let x 2 (mult x (let x 3 y 4 (add x y))))"
Output
14
# Example 2
Input
expression = "(let x 3 x 2 x)"
Output
2
# Example 3
Input
expression = "(let x 1 y 2 x (add x y) (add x y))"
Output
5
Constraints
1 <= expression.length <= 2000
There are no leading or trailing spaces in expression.
All tokens are separated by a single space in expression.
The answer and all intermediate calculations of that answer are guaranteed to fit in a 32-bit integer.
The expression is guaranteed to be legal and evaluate to an integer.
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Solve Parse Lisp Expression — You are given a string expression representing a Lisp-like expression to return ...
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 Parse Lisp Expression and using PhantomCodeAI during coding interviews.
How does PhantomCodeAI help with LeetCode problems during a coding interview?
PhantomCodeAI reads the problem from a screenshot or listens to it via audio, then generates a complete solution with a step-by-step approach and time/space complexity, so you can focus on explaining your reasoning rather than getting stuck on implementation.
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11 languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set a preferred language to get idiomatic solutions.
Does PhantomCodeAI work with HackerRank, CodeSignal, and CoderPad?
Yes — it works alongside LeetCode, HackerRank, CodeSignal, CoderPad, and HackerEarth, plus any browser-based coding environment.
Can PhantomCodeAI handle follow-up questions and modifications?
Yes. Capture the modified problem by screenshot or audio and get an updated solution within seconds, including new edge cases and optimizations.
Is PhantomCodeAI detectable during live interviews?
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Should I still practice these problems on my own first?
Yes. The most durable preparation is solving problems unaided first, then using AI afterward to review your approach, complexity, and missed edge cases — use it to debrief and learn, not to skip the reps.
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