solves #2639: FindTheWidthOfColumnsOfAGri in java

Author: anishLearnsToCode

README.md

@@ -813,7 +813,7 @@
 | 2605 | [Form Smallest Number From Two Digit Arrays](https://leetcode.com/problems/form-smallest-number-from-two-digit-arrays)                                                 |                                                                            [![Java](assets/java.png)](src/FormSmallestNumberFromTwoDigitArrays.java)                                                                             |                                                                                                                                   |
 | 2609 | [Find the Longest Balanced Substring of a Binary String](https://leetcode.com/problems/find-the-longest-balanced-substring-of-a-binary-string)                         |                                                                       [![Java](assets/java.png)](src/FindTheLongestBalancedSubstringOfABinaryString.java)                                                                        |                                                                                                                                   |
 | 2614 | [Prime In Diagonal](https://leetcode.com/problems/prime-in-diagonal)                                                                                                   |                                                                                       [![Java](assets/java.png)](src/PrimeInDiagonal.java)                                                                                       |                                                                                                                                   |
-| 2639 | [Find the Width of Columns of a Grid](https://leetcode.com/problems/find-the-width-of-columns-of-a-grid)                                                               |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2639 | [Find the Width of Columns of a Grid](https://leetcode.com/problems/find-the-width-of-columns-of-a-grid)                                                               |                                                                                [![Java](assets/java.png)](src/FindTheWidthOfColumnsOfAGrid.java)                                                                                 |                                                                                                                                   |
 | 2643 | [Row With Maximum Ones](https://leetcode.com/problems/row-with-maximum-ones)                                                                                           |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2644 | [Find the Maximum Divisibility Score](https://leetcode.com/problems/find-the-maximum-divisibility-score)                                                               |                                                                                                                                                                                                                                  |                                                                                                                                   |
 | 2651 | [Calculate Delayed Arrival Time](https://leetcode.com/problems/calculate-delayed-arrival-time)                                                                         |                                                                                                                                                                                                                                  |                                                                                                                                   |

src/FindTheWidthOfColumnsOfAGrid.java

@@ -0,0 +1,20 @@
+// https://leetcode.com/problems/find-the-width-of-columns-of-a-grid
+// m: rows in matrix
+// n: columns in matrix
+// T: O(m * n)
+// S: O(n)
+
+public class FindTheWidthOfColumnsOfAGrid {
+    public int[] findColumnWidth(int[][] grid) {
+        final int columns = grid[0].length;
+        final int[] result = new int[columns];
+        for (int column = 0 ; column < columns ; column++) {
+            int maxLen = 0;
+            for (int[] row : grid) {
+                maxLen = Math.max(maxLen, (String.valueOf(row[column])).length());
+            }
+            result[column] = maxLen;
+        }
+        return result;
+    }
+}