> #include <stdio.h>
> #include <memory.h>
> const int maxn=22;
> long long ans[maxn][maxn][2];
> int  i,j,m,n,s,t,way[maxn];
> bool use[maxn];
> long long k;
> int pos(int s)
> {
>     int i,n;
>     i=0;n=0;
>     while (n<s)
>     {
>         i++;
>         if (!use[i]) n++;
>     }
>     use[i]=true;
>     return i;
> }          
> void writeans(int depth,long long num,int flag,int st)
> {
>     long long c=0;
>     int i,j,nxtst;
>     if (depth>n) {printf("\n");return;}
>     if (depth!=1) printf(" ");
>     for (i=2*st;i<=2*(n-depth+1)+1&& c<num;i++) 
>     if (i%2==flag || flag==-1)
>             c+=ans[depth][i/2][i%2];
>     i--;
>     printf("%d",pos(i/2));
>     if (i%2==0) nxtst=1;else nxtst=i/2;
>     writeans(depth+1,num-(c-ans[depth][i/2][i%2]),1-i%2,nxtst);
> }     
> void makeans()
> {
>     int i,j,k;
>     memset (ans,0,sizeof(ans));
>     ans[n][1][0]=1;ans[n][1][1]=1;
>     for (i=n-1;i>=1;i--)
>     for (j=1;j<=n-i+1;j++)
>     {
>        for (k=1;k<=j-1;k++) ans[i][j][0]+=ans[i+1][k][1];
>        for (k=j+1;k<=n-i+1;k++) ans[i][j][1]+=ans[i+1][k-1][0];
>     }
> }        
>     
> int main()
> {
>     scanf("%d",&s);
>     for (t=1;t<=s;t++)
>     {
>         scanf("%d %lld",&n,&k);
>         makeans();
>         memset (use,false,sizeof(use));
>         writeans(1,k,-1,1);
>     }
> }         

• Re:大家帮一下忙吧，谢谢了...... (68) nash635 2007-10-14 18:23:31