题解 | #数位五五#

int sm(int a,int b);
int main(){
	int a,b,c;
	scanf("%d %d",&a,&b);
	c=sm(a,b);
	printf("%d\n",c);
	return 0;
}
int sm(int a,int b)
{
	int i,count=0;
	for(i=a;i<=b;i++)
	{
		int sum=0;
		int n=i;
	while(n)
        {
            sum += n % 10;
            n /= 10;
        }
	if(sum%5==0)
		count++;
	}
	return count;
}