Codeforces Round 385 (Div. 1) |
---|

Finished |

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

bitmasks

divide and conquer

interactive

*1900

No tag edit access

The problem statement has recently been changed. View the changes.

×
B. Hongcow's Game

time limit per test

3 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputThis is an interactive problem. In the interaction section below you will see the information about flushing the output.

In this problem, you will be playing a game with Hongcow. How lucky of you!

Hongcow has a hidden *n* by *n* matrix *M*. Let *M*_{i, j} denote the entry *i*-th row and *j*-th column of the matrix. The rows and columns are labeled from 1 to *n*.

The matrix entries are between 0 and 10^{9}. In addition, *M*_{i, i} = 0 for all valid *i*. Your task is to find the minimum value along each row, excluding diagonal elements. Formally, for each *i*, you must find .

To do this, you can ask Hongcow some questions.

A question consists of giving Hongcow a subset of distinct indices {*w*_{1}, *w*_{2}, ..., *w*_{k}}, with 1 ≤ *k* ≤ *n*. Hongcow will respond with *n* integers. The *i*-th integer will contain the minimum value of *min*_{1 ≤ j ≤ k}*M*_{i, wj}.

You may only ask Hongcow at most 20 questions — he thinks you only need that many questions answered.

When you are ready to answer, print out a single integer - 1 on its own line, then *n* integers on the next line. The *i*-th integer should be the minimum value in the *i*-th row of the matrix, excluding the *i*-th element. Do not forget to flush the final answer as well. Printing the answer does not count as asking a question.

You will get Wrong Answer verdict if

- Your question or answers are not in the format described in this statement.
- You ask strictly more than 20 questions.
- Your question contains duplicate indices.
- The value of
*k*in your question does not lie in the range from 1 to*n*, inclusive. - Your final answer is not correct.

Input

The first line of input will contain a single integer *n* (2 ≤ *n* ≤ 1, 000).

Output

To print the final answer, print out the string -1 on its own line. Then, the next line should contain *n* integers. The *i*-th integer should be the minimum value of the *i*-th row of the matrix, excluding elements on the diagonal. Do not forget to flush your answer!

Interaction

To ask a question, print out a single integer *k* on its own line, denoting the size of your subset. Then, the next line should contain *k* integers *w*_{1}, *w*_{2}, ... *w*_{k}. Note, you must flush your output to get a response.

Hongcow will respond by printing out a line with *n* integers. The *i*-th integer in this line represents the minimum value of *M*_{i, wj} where *j* is between 1 and *k*.

You may only ask a question at most 20 times, otherwise, you will get Wrong Answer.

To flush you can use (just after printing an integer and end-of-line):

- fflush(stdout) in C++;
- System.out.flush() in Java;
- stdout.flush() in Python;
- flush(output) in Pascal;
- See the documentation for other languages.

Hacking To hack someone, use the following format

n

M_{1,1} M_{1,2} ... M_{1,n}

M_{2,1} M_{2,2} ... M_{2,n}

...

M_{n,1} M_{n,2} ... M_{n,n}

Of course, contestant programs will not be able to see this input.

Examples

Input

3

0 0 0

2 7 0

0 0 4

3 0 8

0 5 4

Output

3

1 2 3

1

3

2

1 2

1

2

1

1

-1

2 5 4

Input

2

0 0

0 0

Output

1

2

1

1

-1

0 0

Note

In the first sample, Hongcow has the hidden matrix

[

[0, 3, 2],

[5, 0, 7],

[4, 8 ,0],

]

Here is a more readable version demonstrating the interaction. The column on the left represents Hongcow, while the column on the right represents the contestant.

3

3

1 2 3

0 0 0

1

3

2 7 0

2

1 2

0 0 4

1

2

3 0 8

1

1

0 5 4

-1

2 5 4

For the second sample, it is possible for off-diagonal elements of the matrix to be zero.

Codeforces (c) Copyright 2010-2024 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Apr/13/2024 09:48:08 (i2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|