Is Check if Grid Satisfies Conditions easy or hard?

Check if Grid Satisfies Conditions is classified as an Easy problem on LeetCode. The challenge mainly involves translating the problem rules into simple neighbor comparisons while iterating through a matrix.

Check if Grid Satisfies Conditions Python/Java solution

In Python or Java, the solution uses two nested loops to iterate through the grid. For each position (i, j), compare with the cell above for equality and the cell to the left for inequality. If any condition fails, return false; otherwise return true after scanning the entire matrix.

How to solve Check if Grid Satisfies Conditions in O(n)?

Treat the grid as m*n total elements and scan it once using nested loops. For each cell, check vertical equality with grid[i-1][j] and horizontal inequality with grid[i][j-1]. Because each cell is processed once, the overall complexity becomes O(m*n) with constant extra memory.

What is the best approach for Check if Grid Satisfies Conditions?

The iterative grid check is the best approach. Iterate through each cell and verify two rules: the value must match the cell above it and must differ from the cell to its left. This approach runs in O(m*n) time and O(1) extra space, making it optimal for this matrix validation problem.

Is Check if Grid Satisfies Conditions asked at Google/Amazon/Meta?

Matrix validation and adjacency constraint problems frequently appear in coding interviews at companies like Amazon, Google, and Meta. While this exact problem may vary, the pattern of checking neighboring cells in a grid is a common interview concept.

What data structure is used in Check if Grid Satisfies Conditions?

The primary data structure is a 2D array (matrix). The algorithm performs direct index access to compare neighboring cells vertically and horizontally without requiring additional structures like hash maps or stacks.

What is the time complexity of Check if Grid Satisfies Conditions?

The optimal solution runs in O(m*n) time where m is the number of rows and n is the number of columns. Each cell is visited once and only constant-time comparisons with neighboring cells are performed.

Description Hints 2 Solution Video 2:45

3142. Check if Grid Satisfies Conditions

Easy45.7% acceptance

You are given a 2D matrix grid of size m x n. You need to check if each cell grid[i][j] is:

Equal to the cell below it, i.e. grid[i][j] == grid[i + 1][j] (if it exists).
Different from the cell to its right, i.e. grid[i][j] != grid[i][j + 1] (if it exists).

Return true if all the cells satisfy these conditions, otherwise, return false.

Example 1:

Input: grid = [[1,0,2],[1,0,2]]

Output: true

Explanation:

All the cells in the grid satisfy the conditions.

Example 2:

Input: grid = [[1,1,1],[0,0,0]]

Output: false

Explanation:

All cells in the first row are equal.

Example 3:

Input: grid = [[1],[2],[3]]

Output: false

Explanation:

Cells in the first column have different values.

Constraints:

1 <= n, m <= 10
0 <= grid[i][j] <= 9

Topics

Array Matrix

Hints open one at a time

Hint 1

Check if each column has same value in each cell.

Hint 2

If the previous condition is satisfied, we can simply check the first cells in adjacent columns.

2:45

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3142. Check if Grid Satisfies Conditions

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Hints open one at a time

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