# 2639. Find the Width of Columns of a Grid

## Description

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

## Solutions

• class Solution {
public int[] findColumnWidth(int[][] grid) {
int n = grid[0].length;
int[] ans = new int[n];
for (var row : grid) {
for (int j = 0; j < n; ++j) {
int w = String.valueOf(row[j]).length();
ans[j] = Math.max(ans[j], w);
}
}
return ans;
}
}

• class Solution {
public:
vector<int> findColumnWidth(vector<vector<int>>& grid) {
int n = grid[0].size();
vector<int> ans(n);
for (auto& row : grid) {
for (int j = 0; j < n; ++j) {
int w = to_string(row[j]).size();
ans[j] = max(ans[j], w);
}
}
return ans;
}
};

• class Solution:
def findColumnWidth(self, grid: List[List[int]]) -> List[int]:
ans = [0] * len(grid[0])
for row in grid:
for j, x in enumerate(row):
w = len(str(x))
ans[j] = max(ans[j], w)
return ans


• func findColumnWidth(grid [][]int) []int {
ans := make([]int, len(grid[0]))
for _, row := range grid {
for j, x := range row {
w := len(strconv.Itoa(x))
ans[j] = max(ans[j], w)
}
}
return ans
}

func max(a, b int) int {
if a > b {
return a
}
return b
}

• function findColumnWidth(grid: number[][]): number[] {
const n = grid[0].length;
const ans: number[] = new Array(n).fill(0);
for (const row of grid) {
for (let j = 0; j < n; ++j) {
const w: number = String(row[j]).length;
ans[j] = Math.max(ans[j], w);
}
}
return ans;
}


• impl Solution {
pub fn find_column_width(grid: Vec<Vec<i32>>) -> Vec<i32> {
let mut ans = vec![0; grid[0].len()];

for row in grid.iter() {
for (j, num) in row.iter().enumerate() {
let width = num.to_string().len() as i32;
ans[j] = std::cmp::max(ans[j], width);
}
}

ans
}
}