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HomeLeetCode ProblemsCheck if the Rectangle Corner Is Reachable
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How to Solve Check if the Rectangle Corner Is Reachable Problem

Master the Check if the Rectangle Corner Is Reachable LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

PhantomCodeAI generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.

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Hard#3235
LeetCode Problem

Check if the Rectangle Corner Is Reachable

You are given two positive integers xCorner and yCorner, and a 2D array circles, where circles[i] = [xi, yi, ri] denotes a circle with center at (xi, yi) and radius ri. There is a rectangle in the coordinate plane with its bottom left corner at the origin and top right corner at the coordinate (xCorner, yCorner). You need to check whether there is a path from the bottom left corner to the top right corner such that the entire path lies inside the rectangle, does not touch or lie inside any circle, and touches the rectangle only at the two corners. Return true if such a path exists, and false otherwise.

ArrayMathDepth-First SearchBreadth-First SearchUnion FindGeometry

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Problem Breakdown

Understanding the Check if the Rectangle Corner Is Reachable Problem

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

Problem Statement

You are given two positive integers xCorner and yCorner, and a 2D array circles, where circles[i] = [xi, yi, ri] denotes a circle with center at (xi, yi) and radius ri. There is a rectangle in the coordinate plane with its bottom left corner at the origin and top right corner at the coordinate (xCorner, yCorner). You need to check whether there is a path from the bottom left corner to the top right corner such that the entire path lies inside the rectangle, does not touch or lie inside any circle, and touches the rectangle only at the two corners. Return true if such a path exists, and false otherwise.

HardProblem #3235
LeetCode

Check if the Rectangle Corner Is Reachable

Related Topics

ArrayMathDepth-First SearchBreadth-First SearchUnion FindGeometry

How PhantomCodeAI Helps

Get real-time assistance for Check if the Rectangle Corner Is Reachable problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.

Examples

# Example 1

Input
xCorner = 3, yCorner = 4, circles = [[2,1,1]]
Output
true

# Example 2

Input
xCorner = 3, yCorner = 3, circles = [[1,1,2]]
Output
false

# Example 3

Input
xCorner = 3, yCorner = 3, circles = [[2,1,1],[1,2,1]]
Output
false

# Example 4

Input
xCorner = 4, yCorner = 4, circles = [[5,5,1]]
Output
true

Constraints

3 <= xCorner, yCorner <= 109
1 <= circles.length <= 1000
circles[i].length == 3
1 <= xi, yi, ri <= 109

How PhantomCodeAI Helps with LeetCode Problems

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Solve Check if the Rectangle Corner Is Reachable — You are given two positive integers xCorner and yCorner, and a 2D array circles,...

Here's the optimal approach using Array:

def solve(input):
# Optimal O(n) solution
return result

Time: O(n)  |  Space: O(n)

Start Over ⌘G
Think & Crack ⌘↵

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 PhantomCodeAI. 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 Check if the Rectangle Corner Is Reachable and using PhantomCodeAI during coding interviews.

How does PhantomCodeAI help with LeetCode problems during a coding interview?
PhantomCodeAI reads the problem from a screenshot or listens to it via audio, then generates a complete solution with a step-by-step approach and time/space complexity, so you can focus on explaining your reasoning rather than getting stuck on implementation.
Which programming languages does PhantomCodeAI support?
11 languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set a preferred language to get idiomatic solutions.
Does PhantomCodeAI work with HackerRank, CodeSignal, and CoderPad?
Yes — it works alongside LeetCode, HackerRank, CodeSignal, CoderPad, and HackerEarth, plus any browser-based coding environment.
Can PhantomCodeAI handle follow-up questions and modifications?
Yes. Capture the modified problem by screenshot or audio and get an updated solution within seconds, including new edge cases and optimizations.
Is PhantomCodeAI detectable during live interviews?
PhantomCodeAI runs as a native desktop overlay that does not appear in screen shares, recordings, or proctoring software, and works with Zoom, Google Meet, Microsoft Teams, and major coding platforms.
Should I still practice these problems on my own first?
Yes. The most durable preparation is solving problems unaided first, then using AI afterward to review your approach, complexity, and missed edge cases — use it to debrief and learn, not to skip the reps.

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