题解 | #数位五五#

#include <stdio.h>

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