DeBruijin HDU - 2894（？？？？？？？？）

题意：

　　莫名其妙 看不懂。。只能靠别人的题意混日子

　　a完就懂了  就是 POJ1392  不求第k个了  直接输出这个路径

emm 。。。就改了一下那个代码

#include <iostream>
#include <cstdio>
#include <sstream>
#include <cstring>
#include <map>
#include <cctype>
#include <set>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
#include <cmath>
#include <bitset>
#define rap(i, a, n) for(int i=a; i<=n; i++)
#define rep(i, a, n) for(int i=a; i<n; i++)
#define lap(i, a, n) for(int i=n; i>=a; i--)
#define lep(i, a, n) for(int i=n; i>a; i--)
#define rd(a) scanf("%d", &a)
#define rlld(a) scanf("%lld", &a)
#define rc(a) scanf("%c", &a)
#define rs(a) scanf("%s", a)
#define pd(a) printf("%d\n", a);
#define plld(a) printf("%lld\n", a);
#define pc(a) printf("%c\n", a);
#define ps(a) printf("%s\n", a);
#define MOD 2018
#define LL long long
#define ULL unsigned long long
#define Pair pair<int, int>
#define mem(a, b) memset(a, b, sizeof(a))
#define _  ios_base::sync_with_stdio(0),cin.tie(0)
//freopen("1.txt", "r", stdin);
using namespace std;
const int maxn = 16, INF = 0x7fffffff, LL_INF = 0x7fffffffffffffff;
int f[1 << maxn], vis[1 << maxn][2], stk[1 << maxn];
int n, k, tot;

void fleury(int u)
{
    for(int i = 0; i <= 1; i++)
    {
        if(!vis[u][i])
        {
            vis[u][i] = 1;
            fleury(((u << 1) + i) % f[n - 1]);
            stk[tot++] = i;
        }
    }
}

int main()
{
    f[0] = 1;
    for(int i = 1; i < 16; i++)
        f[i] = f[i-1] * 2;
    while(cin >> n)
    {
        mem(vis, 0);
        mem(stk, 0);
        cout << f[n] << " ";
        tot = 0;
        fleury(0);
        tot += n - 2;
        for(int i = tot; i > n - 2; i--)
            cout << stk[i];
        cout << endl;

    }

    return 0;
}