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// @Title: 统计各位数字之和为偶数的整数个数 (Count Integers With Even Digit Sum)
// @Author: 15816537946@163.com
// @Date: 2022-02-20 11:13:51
// @Runtime: 0 ms
// @Memory: 1.8 MB
func countEven(num int) int {
    var ans int
    for i:=2;i<=num;i++ {
        if sumOfnum(i) %2 == 0 {
            ans++
        }
    }
    return ans
}

func sumOfnum(a int) int {
    var ans int
    for a !=0 {
        ans += a%10
        a = a/10
    }
    return ans
}