Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

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13. Labyrinth-13

time limit per test

8 secondsmemory limit per test

512 megabytesinput

standard inputoutput

standard outputSee the problem statement here: http://codeforces.com/contest/921/problem/01.

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