【数位dp】hdu2089 不要62

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
#define s(x,y) scanf("%d%d",&x,&y)
#define p(x) printf("%d\n",x)
int dp[12][2],a[12],n,m;
int dfs(int x,bool now,bool limit)
{
  if (x==0) return 1;
  if ((dp[x][now]>-1)&&(!limit)) return dp[x][now];
  int up=(limit?a[x]:9),tot=0;
  for (int i=0;i<=up;i++)
  {
      if (((now)&&(i==2))||(i==4)) continue;
      tot+=dfs(x-1,i==6,limit&&(i==up));
  }
  return limit?tot:dp[x][now]=tot;
}
int get(int x)
{
  int cnt=0;
  while (x) 
  {
    a[++cnt]=x%10;
    x=x/10;
  }
  return dfs(cnt,false,true);
}
int main()
{
  for (int i=0;i<=11;i++) 
  dp[i][0]=dp[i][1]=-1;
  while (~s(m,n)&&(n||m))
      p(get(n)-get(m-1));
}