2639. Find the Width of Columns of a Grid

Problem

You are given a 0-indexed m x n integer matrix grid. The width of a column is the maximum **length **of its integers.

• For example, if grid = [[-10], [3], [12]], the width of the only column is 3 since -10 is of length 3.

Return an integer array ans of size n where ans[i] is the width of the ith column.

The length of an integer x with len digits is equal to len if x is non-negative, and len + 1 otherwise.

Example 1:

Input: grid = [[1],[22],[333]]
Output: [3]
Explanation: In the 0th column, 333 is of length 3.

Example 2:

Input: grid = [[-15,1,3],[15,7,12],[5,6,-2]]
Output: [3,1,2]
Explanation:
In the 0th column, only -15 is of length 3.
In the 1st column, all integers are of length 1.
In the 2nd column, both 12 and -2 are of length 2.

Constraints:

• m == grid.length
• n == grid[i].length
• 1 <= m, n <= 100
• -109 <= grid[r][c] <= 109

Solution (Java)

class Solution {
    public int[] findColumnWidth(int[][] grid) {
        int [] arr = new int[grid[0].length];
        for(int i=0; i<grid[0].length; i++){
            for(int j=0; j<grid.length; j++){
                arr[i] = Math.max(arr[i],String.valueOf(grid[j][i]).length());
            }
        }
        return arr;
    }
}

Explain:

nope.

Complexity:

• Time complexity : O(n).
• Space complexity : O(n).