PERMUT2  Ambiguous Permutations
Some programming contest problems are really tricky: not only do they
require a different output format from what you might have expected, but
also the sample output does not show the difference. For an example,
let us look at permutations.
A permutation of the integers 1 to n is an
ordering of
these integers. So the natural way to represent a permutation is
to list the integers in this order. With n = 5, a
permutation might look like 2, 3, 4, 5, 1.
However, there is another possibility of representing a permutation:
You create a list of numbers where the ith number is the
position of the integer i in the permutation.
Let us call this second
possibility an inverse permutation. The inverse permutation
for the sequence above is 5, 1, 2, 3, 4.
An ambiguous permutation is a permutation which cannot be
distinguished from its inverse permutation. The permutation 1, 4, 3, 2
for example is ambiguous, because its inverse permutation is the same.
To get rid of such annoying sample test cases, you have to write a
program which detects if a given permutation is ambiguous or not.
Input Specification
The input contains several test cases.
The first line of each test case contains an integer n
(1 ≤ n ≤ 100000).
Then a permutation of the integers 1 to n follows
in the next line. There is exactly one space character
between consecutive integers.
You can assume that every integer between 1 and n
appears exactly once in the permutation.
The last test case is followed by a zero.
Output Specification
For each test case output whether the permutation is ambiguous or not. Adhere to the format shown in the sample output.
Sample Input
4 1 4 3 2 5 2 3 4 5 1 1 1 0
Sample Output
ambiguous not ambiguous ambiguous
hide comments
shantanu_sarin:
20170101 14:49:55
irritating lang


kass_97:
20161231 12:47:14
Unclear problem statement, still AC in 2nd go.....my 100th yeahh 

sri:
20161227 13:43:44
150th...., easy one though question is confused 

shubham_cs_iet:
20161211 18:29:21
spelling of ambiguous cost me 1 TLE. Don't know how....


soodan:
20161211 17:29:36
AC in one go 

codesok:
20161203 15:13:26
Easiest Problem.


aronzx:
20161102 14:31:26
Unclear problem statement! Took me more time to read and make sense of it than getting AC . 

sak_sam:
20161011 12:51:39
AC in one go :D 

nikhil03:
20160823 23:14:58
Easy question, AC in a go!!!


Saif :
20160822 19:55:35
@ragnerok Read the problem statement again ,you are already given a permutation

Added by:  Adrian Kuegel 
Date:  20050624 
Time limit:  10s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: NODEJS PERL 6 VB.net 
Resource:  own problem, used in University of Ulm Local Contest 2005 