题解 | #数位五五#

#include <stdio.h>
#include <math.h>
int fun(int a, int b)
{
    int x;
    int m;
    int count=0;
    
    for(x=a;x<=b;x++)
    {
       m=x/10000;
       m=m+(x%10000)/1000;
       m=m+(x%1000)/100;  
       m=m+(x%100)/10; 
       m=m+x%10; 
     if(m%5==0)
     {
        count++;
     }
        
    }
  //  printf("%d\n",count);
    return count;
}

int main() {
    int a, b;
    int out;
    scanf("%d %d", &a, &b);
    printf("%d",out=fun(a,b));
    return 0;
}