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How to Solve Minimum Cost to Change the Final Value of Expression Problem
Master the Minimum Cost to Change the Final Value of Expression LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#1896
LeetCode ProblemMinimum Cost to Change the Final Value of Expression
You are given a valid boolean expression as a string expression consisting of the characters '1','0','&' (bitwise AND operator),'|' (bitwise OR operator),'(', and ')'. Return the minimum cost to change the final value of the expression. The cost of changing the final value of an expression is the number of operations performed on the expression. The types of operations are described as follows: Note: '&' does not take precedence over '|' in the order of calculation. Evaluate parentheses first, then in left-to-right order.
MathStringDynamic ProgrammingStack
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Problem Breakdown
Understanding the Minimum Cost to Change the Final Value of Expression Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a valid boolean expression as a string expression consisting of the characters '1','0','&' (bitwise AND operator),'|' (bitwise OR operator),'(', and ')'. Return the minimum cost to change the final value of the expression. The cost of changing the final value of an expression is the number of operations performed on the expression. The types of operations are described as follows: Note: '&' does not take precedence over '|' in the order of calculation. Evaluate parentheses first, then in left-to-right order.
HardProblem #1896
LeetCodeMinimum Cost to Change the Final Value of Expression
Related Topics
MathStringDynamic ProgrammingStack
How Phantom Code Helps
Get real-time assistance for Minimum Cost to Change the Final Value of Expression problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
expression = "1&(0|1)"
Output
1
# Example 2
Input
expression = "(0&0)&(0&0&0)"
Output
3
# Example 3
Input
expression = "(0|(1|0&1))"
Output
1
Constraints
1 <= expression.length <= 105
expression only contains '1','0','&','|','(', and ')'
All parentheses are properly matched.
There will be no empty parentheses (i.e: "()" is not a substring of expression).
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Solve Minimum Cost to Change the Final Value of Expression — You are given a valid boolean expression as a string expression consisting of th...
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 Minimum Cost to Change the Final Value of Expression and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Minimum Cost to Change the Final Value of Expression 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 Minimum Cost to Change the Final Value of Expression?
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 Minimum Cost to Change the Final Value of Expression?
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 Minimum Cost to Change the Final Value of Expression 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 Minimum Cost to Change the Final Value of Expression 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 Minimum Cost to Change the Final Value of Expression 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 Minimum Cost to Change the Final Value of Expression 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 Minimum Cost to Change the Final Value of Expression 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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