uva 10821 - Red Huang

終於 AC 了取值構樹，盡量往右邊塞
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//============================================================================  
// Name        : Constructing BST.cpp  
// Date : 2013/3/29 下午3:30:27  
// Author : GCA  
//============================================================================  
#include <iostream>  
#include <cstdio>  
#include <cstring>  
#include <algorithm>  
#include <cmath>  
#include <climits>  
#include <vector>  
#include <set>  
#include <map>  
#include <queue>  
#include <cctype>  
#include <utility>  
using namespace std;  
#ifdef ONLINE\_JUDGE  
#define ll "%lld"  
#else  
#define ll "%I64d"  
#endif  
typedef unsigned int uint;  
typedef long long int Int;  
#define Set(a,s) memset(a,s,sizeof(a))  
#define Write(w) freopen(w,"w",stdout)  
#define Read(r) freopen(r,"r",stdin)  
#define Pln() printf("\\n")  
#define I\_de(x,n)for(Int i=0;i<n;i++)prIntf("%d ",x\[i\]);Pln()  
#define De(x)prIntf(#x"%d\\n",x)  
#define For(i,x)for(Int i=0;i<x;i++)  
#define CON(x,y) x##y  
#define Pmz(dp,nx,ny)for(Int hty=0;hty<ny;hty++){for(Int htx=0;htx<nx;htx++){\\  
    prIntf("%d ",dp\[htx\]\[hty\]);}Pln();}  
#define M 10005  
#define PII pair<Int,Int>  
#define PB push\_back  
#define oo Int\_MAX  
#define Set\_oo 0x3f  
#define Is\_debug true  
#define debug(...) if(Is\_debug)prIntf("DEBUG: "),prIntf(\_\_VA\_ARGS\_\_)  
#define FOR(it,c) for(\_\_typeof((c).begin()) it=(c).begin();it!=(c).end();it++)  
#define eps 1e-6  
bool xdy(double x,double y){return x>y+eps;}  
bool xddy(double x,double y){return x>y-eps;}  
bool xcy(double x,double y){return x<y-eps;}  
bool xcdy(double x,double y){return x<y+eps;}  
Int min3(Int x,Int y,Int z){  
    Int tmp=min(x,y);  
    return min(tmp,z);  
}  
Int max3(Int x,Int y,Int z){  
    Int tmp=max(x,y);  
    return max(tmp,z);  
}  
Int n\[M\];  
Int N,H;  
void rec(Int l,Int r,Int h){  
    if(h>0){  
        Int cont=(1<<(h-1))-1;  
        Int k=r-cont;  
        if(k<l)k=l;  
        if(k>r)k=r;  
        printf(" %lld",k);  
        if(k>l)  
        rec(l,k-1,h-1);  
        if(k<r)  
        rec(k+1,r,h-1);  
    }  
}  
int main() {  
//    freopen("a.txt","w",stdout);  
    ios\_base::sync\_with\_stdio(0);  
    Int ff=0;  
    while(~scanf("%lld%lld",&N,&H)&&N+H){  
        if(N>=(1<<H)){  
            printf("Case %lld: Impossible.\\n",++ff);  
        }else{  
            printf("Case %lld:",++ff);  
            rec(1,N,H);  
            Pln();  
        }  
    }  
  
  
  
}