mediumArrayMatrixPrefix Sum 0 views
Matrix Block Sum
Given a m x n matrix mat and an integer k, return a matrix answer where each answer[i][j] is the sum of all elements mat[r][c] for:
Given a m x n matrix mat and an integer k, return a matrix answer where each answer[i][j] is the sum of all elements mat[r][c] for:
Example 1
Input: mat = [[1,2,3],[4,5,6],[7,8,9]], k = 1
Output: [[12,21,16],[27,45,33],[24,39,28]]
Example 2
Input: mat = [[1,2,3],[4,5,6],[7,8,9]], k = 2
Output: [[45,45,45],[45,45,45],[45,45,45]]
Constraints
- m == mat.length
- n == mat[i].length
- 1 <= m, n, k <= 100
- 1 <= mat[i][j] <= 100
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