题解 | #数位五五#

#include <stdio.h>
int main() 
{
    int a = 0,b = 0;
    int count = 0;
    scanf("%d %d",&a,&b);
    for(int i = a;i <= b;i++)
    {
        int sum = 0;
        a = i;
        while(a)
        {
            sum += a % 10;
            a = a / 10;
        }
        if(sum % 5 == 0)
        {count++;}
    }
    printf("%d",count);
    return 0;
}