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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 <= r <= i + k,j - k <= c <= j + k, and(r, c) is a valid position in the matrix.Example 1:
Output: [[12,21,16],[27,45,33],[24,39,28]]
Example 2:
Output: [[45,45,45],[45,45,45],[45,45,45]]`
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 <= r <= i + k,j - k <= c <= j + k, and(r, c) is a valid position in the matrix.Example 1:
Output: [[12,21,16],[27,45,33],[24,39,28]]
Example 2:
Output: [[45,45,45],[45,45,45],[45,45,45]]`
Output