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How to Solve Coloring A Border Problem
Master the Coloring A Border LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1034
LeetCode ProblemColoring A Border
You are given an m x n integer matrix grid, and three integers row, col, and color. Each value in the grid represents the color of the grid square at that location. Two squares are called adjacent if they are next to each other in any of the 4 directions. Two squares belong to the same connected component if they have the same color and they are adjacent. The border of a connected component is all the squares in the connected component that are either adjacent to (at least) a square not in the component, or on the boundary of the grid (the first or last row or column). You should color the border of the connected component that contains the square grid[row][col] with color. Return the final grid.
ArrayDepth-First SearchBreadth-First SearchMatrix
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Problem Breakdown
Understanding the Coloring A Border Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given an m x n integer matrix grid, and three integers row, col, and color. Each value in the grid represents the color of the grid square at that location. Two squares are called adjacent if they are next to each other in any of the 4 directions. Two squares belong to the same connected component if they have the same color and they are adjacent. The border of a connected component is all the squares in the connected component that are either adjacent to (at least) a square not in the component, or on the boundary of the grid (the first or last row or column). You should color the border of the connected component that contains the square grid[row][col] with color. Return the final grid.
MediumProblem #1034
LeetCodeColoring A Border
Related Topics
ArrayDepth-First SearchBreadth-First SearchMatrix
How Phantom Code Helps
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Examples
# Example 1
Input
grid = [[1,1],[1,2]], row = 0, col = 0, color = 3
Output
[[3,3],[3,2]]
# Example 2
Input
grid = [[1,2,2],[2,3,2]], row = 0, col = 1, color = 3
Output
[[1,3,3],[2,3,3]]
# Example 3
Input
grid = [[1,1,1],[1,1,1],[1,1,1]], row = 1, col = 1, color = 2
Output
[[2,2,2],[2,1,2],[2,2,2]]
Constraints
m == grid.length
n == grid[i].length
1 <= m, n <= 50
1 <= grid[i][j], color <= 1000
0 <= row < m
0 <= col < n
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Solve Coloring A Border — You are given an m x n integer matrix grid, and three integers row, col, and col...
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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Frequently Asked Questions
Common questions about solving Coloring A Border and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Coloring A Border 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 Coloring A Border?
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 Coloring A Border?
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 Coloring A Border 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 Coloring A Border 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 Coloring A Border 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 Coloring A Border 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 Coloring A Border 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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