Sphere Online Judge

SPOJ Problem Set (classical)

4033. Phone List

Problem code: PHONELST


Phone List Given a list of phone numbers, determine if it is consistent in the sense that no number is the prefix of another. Let’s say the phone catalogue listed these numbers:

• Emergency 911

• Alice 97 625 999

• Bob 91 12 54 26

In this case, it’s not possible to call Bob, because the central would direct your call to the emergency line as soon as you had dialled the first three digits of Bob’s phone number. So this list would not be consistent.

Input

The first line of input gives a single integer, 1 <= t <= 40, the number of test cases. Each test case starts with n, the number of phone numbers, on a separate line, 1 <= n <= 10000. Then follows n lines with one unique phone number on each line. A phone number is a sequence of at most ten digits.

Output

For each test case, output “YES” if the list is consistent, or “NO” otherwise.

Example

Input:
2
3
911
97625999
91125426
5
113
12340
123440
12345
98346

Output:
NO
YES

Added by:Andres Galvis
Date:2009-03-08
Time limit:1s-3s
Source limit:50000B
Memory limit:256MB
Cluster: Pyramid (Intel Pentium III 733 MHz)
Languages:All except: ERL JS NODEJS PERL 6
Resource:Nordic Collegiate Programming Contest 2007

hide comments
2014-07-06 14:09:13 Ranjan Kumar Singh
first problem using vector!!!
2014-06-30 02:26:51 The Bear
You don't need to sort the numbers!
2014-06-14 09:52:24 michaelangelo antonioni
trie trie trie <3<3
take care of the fact that you have to create a phone list for every test case not every test case file.i.e;you have to create the node within while(t--){}.. except that very simple

Last edit: 2014-06-14 09:57:55
2014-05-31 10:51:44 IKKA
no need of sorting
2014-04-17 18:45:13 OTAKU
gud question for trie practice...
2013-06-28 03:45:39 +2 RIFAI


Last edit: 2014-02-27 07:44:31
2013-01-31 09:53:48 preetam
agree with gaurav... sort + comparison!!
2012-12-10 16:05:45 Panagiotis Kostopanagiotis
got AC after all, trie is recommended if you want to solve that problem, just be careful with the implementation details.
2012-08-11 23:53:41 MyTh
trie is giving me tle :( dun know how others gt it AC??
2012-06-30 19:54:19 Gaurav
sort + comparison !!
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