链接:http://codeforces.com/contest/510
A. Fox And Snake
Fox Ciel starts to learn programming. The first task is drawing a fox! However, that turns out to be too hard for a beginner, so she decides to draw a snake instead.
A snake is a pattern on a n by m table.
Denote c-th cell of r-th row as (r, c).
The tail of the snake is located at (1, 1), then it's body extends to (1, m),
then goes down 2 rows to (3, m), then goes left to (3, 1) and
so on.
Your task is to draw ......
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