You are given an integer n.
Each number from 1 to n is grouped according to the sum of its digits.
Return the number of groups that have the largest size.
\n\n\n
Example 1:
\n\n\nInput: n = 13\nOutput: 4\nExplanation: There are 9 groups in total, they are grouped according sum of its digits of numbers from 1 to 13:\n[1,10], [2,11], [3,12], [4,13], [5], [6], [7], [8], [9].\nThere are 4 groups with largest size.\n\n\n
Example 2:
\n\n\nInput: n = 2\nOutput: 2\nExplanation: There are 2 groups [1], [2] of size 1.\n\n\n
\n
Constraints:
\n\n1 <= n <= 104Compiled with clang 11 using the latest C++ 17 standard.
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Most standard library headers are already included automatically for your convenience.
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