#D5127. Chocolate Bunny
Chocolate Bunny
Chocolate Bunny
This is an interactive problem.
We hid from you a permutation p of length n, consisting of the elements from 1 to n. You want to guess it. To do that, you can give us 2 different indices i and j, and we will reply with p_{i} mod p_{j} (remainder of division p_{i} by p_{j}).
We have enough patience to answer at most 2 ⋅ n queries, so you should fit in this constraint. Can you do it?
As a reminder, a permutation of length n is an array consisting of n distinct integers from 1 to n in arbitrary order. For example, [2,3,1,5,4] is a permutation, but [1,2,2] is not a permutation (2 appears twice in the array) and [1,3,4] is also not a permutation (n=3 but there is 4 in the array).
Input
The only line of the input contains a single integer n (1 ≤ n ≤ 10^4) — length of the permutation.
Interaction
The interaction starts with reading n.
Then you are allowed to make at most 2 ⋅ n queries in the following way:
- "? x y" (1 ≤ x, y ≤ n, x ≠ y).
After each one, you should read an integer k, that equals p_x mod p_y.
When you have guessed the permutation, print a single line "! " (without quotes), followed by array p and quit.
After printing a query do not forget to output end of line and flush the output. Otherwise, you will get Idleness limit exceeded. To do this, use:
- fflush(stdout) or cout.flush() in C++;
- System.out.flush() in Java;
- flush(output) in Pascal;
- stdout.flush() in Python;
- see documentation for other languages.
Exit immediately after receiving "-1" and you will see Wrong answer verdict. Otherwise you can get an arbitrary verdict because your solution will continue to read from a closed stream.
Hack format
In the first line output n (1 ≤ n ≤ 10^4). In the second line print the permutation of n integers p_1, p_2, …, p_n.
Example
Input
3
1
2
1
0
Output
? 1 2
? 3 2
? 1 3
? 2 1
! 1 3 2
inputFormat
Input
The only line of the input contains a single integer n (1 ≤ n ≤ 10^4) — length of the permutation.
Interaction
The interaction starts with reading n.
Then you are allowed to make at most 2 ⋅ n queries in the following way:
- "? x y" (1 ≤ x, y ≤ n, x ≠ y).
After each one, you should read an integer k, that equals p_x mod p_y.
When you have guessed the permutation, print a single line "! " (without quotes), followed by array p and quit.
After printing a query do not forget to
outputFormat
output end of line and flush the output. Otherwise, you will get Idleness limit exceeded. To do this, use:
- fflush(stdout) or cout.flush() in C++;
- System.out.flush() in Java;
- flush(output) in Pascal;
- stdout.flush() in Python;
- see documentation for other languages.
Exit immediately after receiving "-1" and you will see Wrong answer verdict. Otherwise you can get an arbitrary verdict because your solution will continue to read from a closed stream.
Hack format
In the first line output n (1 ≤ n ≤ 10^4). In the second line print the permutation of n integers p_1, p_2, …, p_n.
Example
Input
3
1
2
1
0
Output
? 1 2
? 3 2
? 1 3
? 2 1
! 1 3 2
样例
3
1
2
1
0
? 1 2
? 2 1
? 1 3
? 3 1
! 1 2 3
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