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How to Solve Shortest Path in Binary Matrix Problem

Master the Shortest Path in Binary Matrix LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

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Medium#1091

LeetCode Problem

Shortest Path in Binary Matrix

Given an n x n binary matrix grid, return the length of the shortest clear path in the matrix. If there is no clear path, return -1. A clear path in a binary matrix is a path from the top-left cell (i.e., (0, 0)) to the bottom-right cell (i.e., (n - 1, n - 1)) such that: The length of a clear path is the number of visited cells of this path.

ArrayBreadth-First SearchMatrix

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Problem Breakdown

Understanding the Shortest Path in Binary Matrix Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

MediumProblem #1091

LeetCode

Shortest Path in Binary Matrix

How Phantom Code Helps

Get real-time assistance for Shortest Path in Binary Matrix problems during coding interviews. Phantom Code provides instant solutions and explanations.

Examples

# Example 1

Input

grid = [[0,1],[1,0]]

Output

# Example 2

Input

grid = [[0,0,0],[1,1,0],[1,1,0]]

Output

# Example 3

Input

grid = [[1,0,0],[1,1,0],[1,1,0]]

Output

-1

Constraints

n == grid.length

n == grid[i].length

1 <= n <= 100

grid[i][j] is 0 or 1

How Phantom Code Helps with LeetCode Problems

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Solve Shortest Path in Binary Matrix — Given an n x n binary matrix grid, return the length of the shortest clear path ...

Here's the optimal approach using Array:

def solve(input):

# Optimal O(n) solution

return result

Time: O(n) | Space: O(n)

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Undetectability Checklist

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Undetectability and technical details

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Platform compatibility and limitations

We work with Zoom, HackerRank, CodeSignal, CoderPad and other web-based platforms. Check the compatibility note and request a browser link if a specific desktop app is unsupported.

Frequently Asked Questions

Common questions about solving Shortest Path in Binary Matrix and using Phantom Code during coding interviews.

How does Phantom Code help me solve coding problems like Shortest Path in Binary Matrix 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 Shortest Path in Binary Matrix?

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 Shortest Path in Binary Matrix?

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 Shortest Path in Binary Matrix 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 Shortest Path in Binary Matrix 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 Shortest Path in Binary Matrix 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 Shortest Path in Binary Matrix 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 Shortest Path in Binary Matrix 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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