Discussion @ 1276. Train @ Timus Online Judge

vrandik tests [3] // Problem 1276. Train 1 Sep 2004 00:05

What answer must be in this input???:
7 7
AA
AA
AB
AB
AB
BA
BA
BA

Grebnov Ilya[Ivanovo SPU] Re: tests [2] // Problem 1276. Train 1 Sep 2004 01:47

YES
4

wwby Re: tests [1] // Problem 1276. Train 5 Sep 2004 15:47

Why not
YES
6 ?
AAAAABBAABBAAB
ABBAAAAAABBAAB
ABBAABBAAAAAAB
AAABBAAAABBAAB
ABBAAAABBAAAAB
AAABBAABBAAAAB

ahyangyi_newid Re: tests // Problem 1276. Train 8 Jan 2006 12:53

AA(the first one) is the locomotive , not BA(the last one).
And your answer made me puzzled for a long time! :(

Discussion of Problem 1276. Train