题解 | #数位五五#

#include <stdio.h>

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