HDU3555[Bomb]--数位DP

#include<cstdio>
#include<cstring>
#define LL long long
using namespace std;
const int maxn=25;
int T,n,a[maxn];
LL m,f[maxn][10];
inline LL Read()
{
LL res=0; char ch=getchar();
while (ch<'0'||ch>'9') ch=getchar();
while (ch>='0'&&ch<='9') res=res*10+ch-48,ch=getchar();
return res;
}
LL Dfs(int x,int las,bool pd)
{
if (x>n) return 1;
if (!pd&&f[x][las]) return f[x][las];
int MAX=9; if (pd) MAX=a[x]; f[x][las]=0;
for (int i=0; i<=MAX; i++)
if (las!=4||(las==4&&i!=9)) f[x][las]+=Dfs(x+1,i,pd&(i==a[x]));
return f[x][las];
}
void Work()
{
a[0]=n=m=0; char ch=getchar();
while (ch<'0'||ch>'9') ch=getchar();
while (ch>='0'&&ch<='9') m=m*10+ch-48,a[++n]=ch-48,ch=getchar();
printf("%lld\n",m-Dfs(1,0,1)+1);
}
int main()
{
T=Read();
while (T--) Work();
return 0;
}