Card Trick
时间限制:1000 ms | 内存限制:65535 KB
难度:3
- 描述
-
The magician shuffles a small pack of cards, holds it face down and performs the following procedure:
- The top card is moved to the bottom of the pack. The new top card is dealt face up onto the table. It is the Ace of Spades.
- Two cards are moved one at a time from the top to the bottom. The next card is dealt face up onto the table. It is the Two of Spades.
- Three cards are moved one at a time…
- This goes on until the nth and last card turns out to be the n of Spades.
This impressive trick works if the magician knows how to arrange the cards beforehand (and knows how to give a false shuffle). Your program has to determine the initial order of the cards for a given number of cards, 1 ≤ n ≤ 13.
- 输入
- On the first line of the input is a single positive integer k, telling the number of test cases to follow. 1 ≤ k ≤ 10 Each case consists of one line containing the integer n. 1 ≤ n ≤ 13 输出
- For each test case, output a line with the correct permutation of the values 1 to n, space separated. The first number showing the top card of the pack, etc… 样例输入
-
245
样例输出 -
2 1 4 33 1 4 5 2 参考代码,用的双端队列写的
1 2 #include
3 #include 4 #include 5 using namespace std; 6 int main() 7 { 8 deque q; 9 int t,n,a,m,i,k,j;10 cin>>t;11 while(t--)12 { while(!q.empty())13 q.pop_front();14 cin>>n;15 int mm=n-1,kk=2;16 q.push_front(n);17 for(i=n-1;i>=1;i--,mm--,++kk)18 {19 q.push_front(mm);20 for(j=i%kk;j>0;j--)21 {22 q.push_front(q.back());23 q.pop_back();24 }25 }26 for(i=0;i