## Welcome To SDIBT ACM-ICPC Online Judge

VIRTUAL JUDGE Recent Contest F.A.Qs Forum Home ProblemSet Status Ranklist 69 Contest LoginRegister Exam
Problem 1174. -- Phone List

## Phone List

Time Limit: 2 Sec  Memory Limit: 64 MB
Submit: 874  Solved: 163
[Submit][Status][Forum]

## Description

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.

```2
3
911
97625999
91125426
5
113
12340
123440
12345
98346```

```NO
YES```

zoj2876

## Source

The 2007 Nordic Collegiate Programming Contest

[Submit][Status][Forum]

HOME Back

한국어 中文 English
All Copyright Reserved 2008-2010 SDIBT TEAM
GPL2.0 2003-2010 HUSTOJ Project TEAM