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谁来帮帮忙吧......wa的不行了(附代码)#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); } } Followed by:
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