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How to Solve Flood Fill Problem

Master the Flood Fill LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

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Easy#733

LeetCode Problem

Flood Fill

You are given an image represented by an m x n grid of integers image, where image[i][j] represents the pixel value of the image. You are also given three integers sr, sc, and color. Your task is to perform a flood fill on the image starting from the pixel image[sr][sc]. To perform a flood fill: Return the modified image after performing the flood fill.

ArrayDepth-First SearchBreadth-First SearchMatrix

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Problem Breakdown

Understanding the Flood Fill Problem

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

Problem Statement

EasyProblem #733

LeetCode

Flood Fill

How Phantom Code Helps

Get real-time assistance for Flood Fill problems during coding interviews. Phantom Code provides instant solutions and explanations.

Examples

# Example 1

Input

image = [[1,1,1],[1,1,0],[1,0,1]], sr = 1, sc = 1, color = 2

Output

[[2,2,2],[2,2,0],[2,0,1]]

# Example 2

Input

image = [[0,0,0],[0,0,0]], sr = 0, sc = 0, color = 0

Output

[[0,0,0],[0,0,0]]

Constraints

m == image.length

n == image[i].length

1 <= m, n <= 50

0 <= image[i][j], color < 216

0 <= sr < m

0 <= sc < n

How Phantom Code Helps with LeetCode Problems

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Solve Flood Fill — You are given an image represented by an m x n grid of integers image, where ima...

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

Run compatibility test before interviews

Use recommended Zoom version settings

Enable advanced screen capture options

Verify native desktop architecture

Test with screen recording software

Platform Compatibility

Zoom

Supported

Google Meet

Supported

HackerRank

Supported

CodeSignal

Supported

CoderPad

Supported

Teams

Supported

User results and traction

Thousands of developers use Phantom Code. Social proof signals that this approach helps real candidates land offers across a range of companies.

Undetectability and technical details

Our native desktop architecture avoids common detection vectors used by browser extensions. We provide a clear checklist so you can run basic checks and confirm the app will be invisible.

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 Flood Fill and using Phantom Code during coding interviews.

How does Phantom Code help me solve coding problems like Flood Fill 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 Flood Fill?

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 Flood Fill?

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 Flood Fill 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 Flood Fill 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 Flood Fill 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 Flood Fill 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 Flood Fill 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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