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How to Solve Minimum Swaps to Arrange a Binary Grid Problem
Master the Minimum Swaps to Arrange a Binary Grid LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1536
LeetCode ProblemMinimum Swaps to Arrange a Binary Grid
Given an n x n binary grid, in one step you can choose two adjacent rows of the grid and swap them. A grid is said to be valid if all the cells above the main diagonal are zeros. Return the minimum number of steps needed to make the grid valid, or -1 if the grid cannot be valid. The main diagonal of a grid is the diagonal that starts at cell (1, 1) and ends at cell (n, n).
ArrayGreedyMatrix
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Problem Breakdown
Understanding the Minimum Swaps to Arrange a Binary Grid Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given an n x n binary grid, in one step you can choose two adjacent rows of the grid and swap them. A grid is said to be valid if all the cells above the main diagonal are zeros. Return the minimum number of steps needed to make the grid valid, or -1 if the grid cannot be valid. The main diagonal of a grid is the diagonal that starts at cell (1, 1) and ends at cell (n, n).
MediumProblem #1536
LeetCodeMinimum Swaps to Arrange a Binary Grid
Related Topics
ArrayGreedyMatrix
How Phantom Code Helps
Get real-time assistance for Minimum Swaps to Arrange a Binary Grid problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
grid = [[0,0,1],[1,1,0],[1,0,0]]
Output
3
# Example 2
Input
grid = [[0,1,1,0],[0,1,1,0],[0,1,1,0],[0,1,1,0]]
Output
-1
# Example 3
Input
grid = [[1,0,0],[1,1,0],[1,1,1]]
Output
0
Constraints
n == grid.length == grid[i].length
1 <= n <= 200
grid[i][j] is either 0 or 1
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Solve Minimum Swaps to Arrange a Binary Grid — Given an n x n binary grid, in one step you can choose two adjacent rows of the ...
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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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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.
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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.
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What coding mistakes does Phantom Code help me avoid during Minimum Swaps to Arrange a Binary Grid 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.
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How does Phantom Code help when I'm struggling with Minimum Swaps to Arrange a Binary Grid 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.
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