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How to Solve Different Ways to Add Parentheses Problem
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Medium#241
LeetCode ProblemDifferent Ways to Add Parentheses
Given a string expression of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. You may return the answer in any order. The test cases are generated such that the output values fit in a 32-bit integer and the number of different results does not exceed 104.
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Problem Breakdown
Understanding the Different Ways to Add Parentheses Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a string expression of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. You may return the answer in any order. The test cases are generated such that the output values fit in a 32-bit integer and the number of different results does not exceed 104.
MediumProblem #241
LeetCodeDifferent Ways to Add Parentheses
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How PhantomCodeAI Helps
Get real-time assistance for Different Ways to Add Parentheses problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.
Examples
# Example 1
Input
expression = "2-1-1"
Output
[0,2]
# Example 2
Input
expression = "2*3-4*5"
Output
[-34,-14,-10,-10,10]
Constraints
1 <= expression.length <= 20
expression consists of digits and the operator '+', '-', and '*'.
All the integer values in the input expression are in the range [0, 99].
The integer values in the input expression do not have a leading '-' or '+' denoting the sign.
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Solve Different Ways to Add Parentheses — Given a string expression of numbers and operators, return all possible results ...
Here's the optimal approach using Math:
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 Different Ways to Add Parentheses 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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Can PhantomCodeAI handle follow-up questions and modifications?
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Should I still practice these problems on my own first?
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