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How to Solve Cells with Odd Values in a Matrix Problem
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Easy#1252
LeetCode ProblemCells with Odd Values in a Matrix
There is an m x n matrix that is initialized to all 0's. There is also a 2D array indices where each indices[i] = [ri, ci] represents a 0-indexed location to perform some increment operations on the matrix. For each location indices[i], do both of the following: Given m, n, and indices, return the number of odd-valued cells in the matrix after applying the increment to all locations in indices. Example 1: Example 2: Constraints: Follow up: Could you solve this in O(n + m + indices.length) time with only O(n + m) extra space?
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Problem Breakdown
Understanding the Cells with Odd Values in a Matrix Problem
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Problem Statement
There is an m x n matrix that is initialized to all 0's. There is also a 2D array indices where each indices[i] = [ri, ci] represents a 0-indexed location to perform some increment operations on the matrix. For each location indices[i], do both of the following: Given m, n, and indices, return the number of odd-valued cells in the matrix after applying the increment to all locations in indices. Example 1: Example 2: Constraints: Follow up: Could you solve this in O(n + m + indices.length) time with only O(n + m) extra space?
EasyProblem #1252
LeetCodeCells with Odd Values in a Matrix
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Examples
# Example 1
Input
m = 2, n = 3, indices = [[0,1],[1,1]]
Output
6
# Example 2
Input
m = 2, n = 2, indices = [[1,1],[0,0]]
Output
0
Constraints
1 <= m, n <= 50
1 <= indices.length <= 100
0 <= ri < m
0 <= ci < n
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Solve Cells with Odd Values in a Matrix — There is an m x n matrix that is initialized to all 0's. There is also a 2D arra...
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 Cells with Odd Values in a Matrix and using PhantomCodeAI during coding interviews.
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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.
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