题解 | #数位五五#

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