DOC

1050 PHONE LIST

By Martha Woods,2014-01-15 19:53
8 views 0
1050 PHONE LIST

    Phone List

    时间限制;5000 ms | 内存限制;65536 KB

    描述

    Given a list of phone numbers, determine if it is consistent in the sense that no number is

    the prefix of another.

    Lets say the phone catalogue listed these numbers:

     Emergency 911

     Alice 97 625 999

     Bob 91 12 54 26

    In this case, its 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 Bobs phone number. So this list would not be consistent.

    输入

    The first line of input gives a single integer, 1 ? t ? 40, the number of test cases. Each test

    , the number of phone numbers, on a separate line, 1 ? ? 10000. case starts with nn

    Then follows n lines with one unique phone number on each line. A phone number is a

    sequence of at most ten digits.

    输出

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

    样例输入

    2

    3

    911

    97625999

    91125426

    5

    113

    12340

    123440

    12345

    98346

    样例输出

    NO

YES

来源

Nordic Collegiate Programming Contest 2007

Report this document

For any questions or suggestions please email
cust-service@docsford.com