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How to Solve Minimum Number of Visited Cells in a Grid Problem
Master the Minimum Number of Visited Cells in a Grid LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsHard#2617
LeetCode ProblemMinimum Number of Visited Cells in a Grid
You are given a 0-indexed m x n integer matrix grid. Your initial position is at the top-left cell (0, 0). Starting from the cell (i, j), you can move to one of the following cells: Return the minimum number of cells you need to visit to reach the bottom-right cell (m - 1, n - 1). If there is no valid path, return -1.
ArrayDynamic ProgrammingStackBreadth-First SearchUnion FindHeap (Priority Queue)MatrixMonotonic Stack
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Problem Breakdown
Understanding the Minimum Number of Visited Cells in a Grid Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a 0-indexed m x n integer matrix grid. Your initial position is at the top-left cell (0, 0). Starting from the cell (i, j), you can move to one of the following cells: Return the minimum number of cells you need to visit to reach the bottom-right cell (m - 1, n - 1). If there is no valid path, return -1.
HardProblem #2617
LeetCodeMinimum Number of Visited Cells in a Grid
Related Topics
ArrayDynamic ProgrammingStackBreadth-First SearchUnion FindHeap (Priority Queue)MatrixMonotonic Stack
How Phantom Code Helps
Get real-time assistance for Minimum Number of Visited Cells in a Grid problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
grid = [[3,4,2,1],[4,2,3,1],[2,1,0,0],[2,4,0,0]]
Output
4
# Example 2
Input
grid = [[3,4,2,1],[4,2,1,1],[2,1,1,0],[3,4,1,0]]
Output
3
# Example 3
Input
grid = [[2,1,0],[1,0,0]]
Output
-1
Constraints
m == grid.length
n == grid[i].length
1 <= m, n <= 105
1 <= m * n <= 105
0 <= grid[i][j] < m * n
grid[m - 1][n - 1] == 0
How Phantom Code Helps with LeetCode Problems
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Solve Minimum Number of Visited Cells in a Grid — You are given a 0-indexed m x n integer matrix grid. Your initial position is at...
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 Minimum Number of Visited Cells in a Grid and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Minimum Number of Visited Cells in a Grid 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 Minimum Number of Visited Cells in a Grid?
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 Minimum Number of Visited Cells in a Grid?
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 Minimum Number of Visited Cells in a Grid 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 Minimum Number of Visited Cells in a 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.
Is Phantom Code detectable when solving problems like Minimum Number of Visited Cells in a Grid 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 Minimum Number of Visited Cells in a 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.
Does Phantom Code work for the coding platforms used in Minimum Number of Visited Cells in a Grid 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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