I implemented BFS solution and getting WA6. Persons,who ACed now but had problems with this test in the past,please,tell me,what is the possible reason of failure? For russian-speakers: i implemented approach, which K@DR explained me here:
http://e-maxx.ru/forum/viewtopic.php?id=313

Edited by author 19.11.2010 16:40

if you have WA6, try this test

2
ab
abab

answer:
YES
abab

But now I have problems with 8-th test:( Who can help me?

if wa6, try this

4
ab
ba
aba
bab

YES
ababa


3
abcab
abc
c

YES
abcabc