Count Integers With Even Digit Sum

Challenge Points: 10

Level: Easy

You are given a positive integer num.
You must count how many numbers from 1 to num (inclusive) have a digit sum that is even.

The digit sum of a number is found by adding all the digits in it.
Return how many numbers satisfy this condition.

Input: num = 1

Output: 0

Explanation:

Only number is 1 → digit sum is 1 → not even.

Input: num = 10

Output: 4

Explanation:

Numbers with even digit sum → 2, 4, 6, 8, 10

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