Company: Visa iit roorkee
Difficulty: medium
Matrix Block Sum Problem Description 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: i - k j - k , and (r, c) is a valid position in the matrix. Examples 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 1