Labyrinth:how to find the exit?

I have a list of the rooms(e.x. ((1 2) (2 4) (IN 1) (IN 3) (1 3) (4 5) (5 OUT)),where () means that rooms are connected with each other "IN"-entrance,"OUT"-exit).Would you be so kind to explaine the algorithm ,which can find the exit ?

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we won't do your homework for you

...nor is this question relevant to programming languages.

i don't want you to write me

i don't want you to write me program....I just wanna to explaine(in the words) basic algorithm,which could find the exit..


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