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1129 - Consistency Checker
 PDF (English) Statistics Forum
 Time Limit: 2 second(s) Memory Limit: 32 MB

SETI is receiving some weird signals for the past few days. After converting them to our number system they found out that some numbers are repeating. Due to travelling millions of miles signal gets distorted. Now they asked you check the consistency of their data sets. The consistency is that, no number is the prefix another number in that data set. Let's consider a data set:

1.      123

2.      5123456

3.      123456

In this data set, numbers not consistent, because the first number is the prefix of the third one.

# Input

Input starts with an integer T (≤ 50), denoting the number of test cases.

Each case starts with an integer n (1 ≤ n ≤ 10000) denoting the total numbers in their list. Each of the next n lines contains one unique phone number. A number is a sequence of digits and has length from 1 to 10.

# Output

For each case, print the case number and 'YES' if the list is consistent or 'NO' if it's not.

# Output for Sample Input

2

3

911

97625999

91125426

5

113

12340

123440

12345

98346

Case 1: NO

Case 2: YES

Problem Setter: S. M. Ijaz-ul-Amin Chowdhury
Special Thanks: Jane Alam Jan (Solution, Dataset)
 Developed and Maintained by JANE ALAM JAN Copyright © 2012 LightOJ, Jane Alam Jan