1869176_tle.c

北大大牛代码 1240道题的原代码 超级权威

# include <stdio.h>
# define pass 1
int main()
{
  long m, n;
  long i, r, l;
  
  while(scanf("%ld%ld",&m,&n)==2)
  {
    if(!n) {printf("1\n");continue;}
    n = m-n+1;
    l = 1;
    for(i = n; i <= m; i++)
    {
      r = i;
      while(r%10==0)
        r/=10;
      if(r==1) continue;
      if(r%5==0)
         l*=r;
      else 
         l*=(r%10);
       while(l%10==0)
        l/=10;
        l%=10;
    }
    printf("%ld\n",l);
  }
  return pass;
}