README_EN.md

1314. Matrix Block Sum

中文文档

Description

Given a m * 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:

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:

<li><code>m ==&nbsp;mat.length</code></li>

<li><code>n ==&nbsp;mat[i].length</code></li>

<li><code>1 &lt;= m, n, K &lt;= 100</code></li>

<li><code>1 &lt;= mat[i][j] &lt;= 100</code></li>

Solutions

Python3

Java

...