1399. Count Largest Group

https://leetcode.com/problems/count-largest-group

Description

Given an integer n. Each number from 1 to n is grouped according to the sum of its digits.

Return how many groups have the largest size.

Example 1:

**Input:** n = 13
**Output:** 4
**Explanation:** There are 9 groups in total, they are grouped according sum of its digits of numbers from 1 to 13:
[1,10], [2,11], [3,12], [4,13], [5], [6], [7], [8], [9]. There are 4 groups with largest size.

Example 2:

**Input:** n = 2
**Output:** 2
**Explanation:** There are 2 groups [1], [2] of size 1.

Example 3:

**Input:** n = 15
**Output:** 6

Example 4:

**Input:** n = 24
**Output:** 5

Constraints:

• 1 <= n <= 10^4

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