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How to Solve Minimum Number of Swaps to Make the String Balanced Problem
Master the Minimum Number of Swaps to Make the String Balanced LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1963
LeetCode ProblemMinimum Number of Swaps to Make the String Balanced
You are given a 0-indexed string s of even length n. The string consists of exactly n / 2 opening brackets '[' and n / 2 closing brackets ']'. A string is called balanced if and only if: You may swap the brackets at any two indices any number of times. Return the minimum number of swaps to make s balanced.
Two PointersStringStackGreedy
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Problem Breakdown
Understanding the Minimum Number of Swaps to Make the String Balanced Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a 0-indexed string s of even length n. The string consists of exactly n / 2 opening brackets '[' and n / 2 closing brackets ']'. A string is called balanced if and only if: You may swap the brackets at any two indices any number of times. Return the minimum number of swaps to make s balanced.
MediumProblem #1963
LeetCodeMinimum Number of Swaps to Make the String Balanced
Related Topics
Two PointersStringStackGreedy
How Phantom Code Helps
Get real-time assistance for Minimum Number of Swaps to Make the String Balanced problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
s = "][]["
Output
1
# Example 2
Input
s = "]]][[["
Output
2
# Example 3
Input
s = "[]"
Output
0
Constraints
n == s.length
2 <= n <= 106
n is even.
s[i] is either '[' or ']'.
The number of opening brackets '[' equals n / 2, and the number of closing brackets ']' equals n / 2.
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Solve Minimum Number of Swaps to Make the String Balanced — You are given a 0-indexed string s of even length n. The string consists of exac...
Here's the optimal approach using Two Pointers:
def solve(input):
# Optimal O(n) solution
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Time: O(n) | Space: O(n)
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Frequently Asked Questions
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How does Phantom Code help me solve coding problems like Minimum Number of Swaps to Make the String Balanced 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 Number of Swaps to Make the String Balanced?
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 Number of Swaps to Make the String Balanced?
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 Number of Swaps to Make the String Balanced 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 Number of Swaps to Make the String Balanced 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 Number of Swaps to Make the String Balanced 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 Number of Swaps to Make the String Balanced 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 Number of Swaps to Make the String Balanced 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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