solves #2373: Largest Local Values in a Matrix in java

Author: anishLearnsToCode

README.md

@@ -759,7 +759,7 @@
 | 2360 | [Longest Cycle in a Graph](https://leetcode.com/problems/longest-cycle-in-a-graph)                                                                                     |                                                                                 [![Python](assets/python.png)](python/longest_cycle_in_graph.py)                                                                                 |                                                                                                                                   |
 | 2363 | [Merge Similar Items](https://leetcode.com/problems/merge-similar-items)                                                                                               |                                                                                      [![Java](assets/java.png)](src/MergeSimilarItems.java)                                                                                      |                                                                                                                                   |
 | 2367 | [Number of Arithmetic Triplets](https://leetcode.com/problems/number-of-arithmetic-triplets)                                                                           |                                                                                 [![Java](assets/java.png)](src/NumberOfArithmeticTriplets.java)                                                                                  |                                                                                                                                   |
-| 2373 | [Largest Local Values in a Matrix](https://leetcode.com/problems/largest-local-values-in-a-matrix)                                                                     |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2373 | [Largest Local Values in a Matrix](https://leetcode.com/problems/largest-local-values-in-a-matrix)                                                                     |                                                                                 [![Java](assets/java.png)](src/LargestLocalValuesInAMatrix.java)                                                                                 |                                                                                                                                   |
 | 2379 | [Minimum Recolors to Get K Consecutive Black Blocks](https://leetcode.com/problems/minimum-recolors-to-get-k-consecutive-black-blocks)                                 |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2383 | [Minimum Hours of Training to Win a Competition](https://leetcode.com/problems/minimum-hours-of-training-to-win-a-competition)                                         |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2389 | [Longest Subsequence With Limited Sum](https://leetcode.com/problems/longest-subsequence-with-limited-sum)                                                             |                                                                                                                                                                                                                                  |                                                                                                                                   |

src/LargestLocalValuesInAMatrix.java

@@ -0,0 +1,28 @@
+// https://leetcode.com/problems/largest-local-values-in-a-matrix
+// T: O(n ^ 2)
+// S: O(n ^ 2)
+
+public class LargestLocalValuesInAMatrix {
+    public int[][] largestLocal(int[][] grid) {
+        final int n = grid.length;
+        final int[][] result = new int[n - 2][n - 2];
+
+        for (int row = 1 ; row < n - 1 ; row++) {
+            for (int column = 1 ; column < n - 1 ; column++) {
+                result[row - 1][column - 1] = localMax(grid, row, column);
+            }
+        }
+
+        return result;
+    }
+
+    private int localMax(int[][] grid, int row, int column) {
+        int max = Integer.MIN_VALUE;
+        for (int i = row - 1 ; i <= row + 1 ; i++) {
+            for (int j = column - 1 ; j <= column + 1 ; j++) {
+                max = Math.max(max, grid[i][j]);
+            }
+        }
+        return max;
+    }
+}