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refactor 1314
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src/main/java/com/fishercoder/solutions/_1314.java

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import java.util.ArrayList;
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import java.util.List;
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/**
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* 1314. Matrix Block Sum
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*
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* Given a m * n matrix mat and an integer K,
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* return a matrix answer where each answer[i][j] is the sum of all elements
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* mat[r][c] for i - K <= r <= i + K, j - K <= c <= j + K, and (r, c) is a valid position in the matrix.
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*
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* Example 1:
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* Input: mat = [[1,2,3],[4,5,6],[7,8,9]], K = 1
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* Output: [[12,21,16],[27,45,33],[24,39,28]]
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*
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* Example 2:
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* Input: mat = [[1,2,3],[4,5,6],[7,8,9]], K = 2
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* Output: [[45,45,45],[45,45,45],[45,45,45]]
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*
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* Constraints:
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* m == mat.length
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* n == mat[i].length
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* 1 <= m, n, K <= 100
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* 1 <= mat[i][j] <= 100
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* */
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public class _1314 {
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public static class Solution1 {
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public int[][] matrixBlockSum(int[][] mat, int K) {

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