hdu 4535 错排

题意：错排

链接：点我

百年难得一遇大水题

 1 #include<cstdio>
 2 #include<iostream>
 3 #include<algorithm>
 4 #include<cstring>
 5 #include<cmath>
 6 #include<queue>
 7 #include<map>
 8 using namespace std;
 9 #define MOD 1000000007
10 const int INF=0x3f3f3f3f;
11 const double eps=1e-5;
12 #define cl(a) memset(a,0,sizeof(a))
13 #define ts printf("*****\n");
14 const int MAXN=1005;
15 int n,m,tt;
16 long long f[110];
17 void init()
18 {
19     f[1]=0;
20     f[2]=1;
21     for(int i=3;i<=100;i++)
22     {
23         f[i]=f[i-1]+f[i-2];
24         f[i]%=MOD;
25         f[i]*=(i-1);
26         f[i]%=MOD;
27     }
28 }
29 int main()
30 {
31     int i,j,k;
32     #ifndef ONLINE_JUDGE
33     freopen("1.in","r",stdin);
34     #endif
35     scanf("%d",&tt);
36     init();
37     while(tt--)
38     {
39         scanf("%d",&n);
40         printf("%I64d\n",f[n]);
41     }
42 }