OJ-Problems-Source/HDOJ/3464_autoAC.cpp

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#include <stdio.h>
#include <cstring>
#include <algorithm>
using namespace std;
const int mod=100007;
int dp[30];
int succ[mod],cycle;
void get_T(int m)
{
int cnt=1;
memset(succ,-1,sizeof(succ));
succ[0]=0;
int now=0;
while(1)
{
now=(now*10+2)%m;
if (succ[now]!=-1)
{
cycle=cnt-succ[now];
break;
}
succ[now]=cnt++;
}
}
int cal(int x,int m)
{
if (x==1) return 1;
get_T(m);
int tmp=cal(x-1,cycle);
int now=0;
while(tmp--)
{
now=now*10+2;
if (now>=m)
{
int t=(now-mod)/m;
now=now-t*m;
}
}
return now;
}
int main()
{
for (int i=1;i<10;i++)
{
dp[i]=(9*cal(i,mod)+1)%mod;
}
int n;
while(scanf("%d",&n)!=EOF)
{
int ans;
if (n<=9)
ans=n==1?1:dp[n-1];
else
if (n%2==1)
ans=dp[8];
else ans=dp[7];
printf("%d\n",ans);
}
return 0;
}