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Add MinimumAbsoluteDifferenceSlidingSubmatrix.java to calculate minimum absolute difference in sliding submatrices #2

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Add MinimumAbsoluteDifferenceSlidingSubmatrix.java to calculate minimum absolute difference in sliding submatrices #2

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27 changes: 27 additions & 0 deletions Java/MinimumAbsoluteDifferenceSlidingSubmatrix.java
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import java.util.Arrays;

public class MinimumAbsoluteDifferenceSlidingSubmatrix {
public int[][] minAbsDiff(int[][] grid, int k) {
int m = grid.length, n = grid[0].length;
int[][] ans = new int[m - k + 1][n - k + 1];

for (int i = 0; i <= m - k; i++) {
for (int j = 0; j <= n - k; j++) {
int[] nums = new int[k * k];
int idx = 0;
for (int x = i; x < i + k; x++)
for (int y = j; y < j + k; y++)
nums[idx++] = grid[x][y];

Arrays.sort(nums);
int minDiff = Integer.MAX_VALUE;
for (int p = 1; p < nums.length; p++)
if (nums[p] != nums[p - 1])
minDiff = Math.min(minDiff, nums[p] - nums[p - 1]);

ans[i][j] = minDiff == Integer.MAX_VALUE ? 0 : minDiff;
}
}
return ans;
}
}