Ezvor

2180. Count Integers With Even Digit Sum

EasyMath Preparing judge… LeetCode

Given a positive integer num, return the number of positive integers less than or equal to num whose digit sums are even.

The digit sum of a positive integer is the sum of all its digits.

 

Example 1:

Input: num = 4
Output: 2
Explanation:
The only integers less than or equal to 4 whose digit sums are even are 2 and 4.

Example 2:

Input: num = 30
Output: 14
Explanation:
The 14 integers less than or equal to 30 whose digit sums are even are
2, 4, 6, 8, 11, 13, 15, 17, 19, 20, 22, 24, 26, and 28.

 

Constraints:

  • 1 <= num <= 1000
MathSimulation

Hints

Hint 1
Iterate through all integers from 1 to num.
Hint 2
For any integer, extract the individual digits to compute their sum and check if it is even.