Package g2101_2200.s2180_count_integers_with_even_digit_sum

Class Solution

java.lang.Object
g2101_2200.s2180_count_integers_with_even_digit_sum.Solution
public class Solution extends java.lang.Object
2180 - Count Integers With Even Digit Sum.

Easy

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

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    countEven(int n)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • countEven

      public int countEven(int n)