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Thank you Martin Macko.
I found out that my code could push the same vertex twice or more in the queue.

Hello everyone!
I've tried all the input avaliable in this thread and my code seems to work with them, except for that one from mamud, I think, where there are edges that connect vertexes beyond the limit previously given.
Anyway, I just keep getting WA.
Here is my code, can anyone tell me where is ...

Even finding this kind of problem in some text books and using their code, I keep getting WA in this one.
I think I've checked the input correctly and the code seems ok with the one found in chapter 11 of Programming Challenges (it looks the same actually).
I've compared my output with the one ...