Boustrophedon
Print the matrix in snake order: row 1 left-to-right, row 2 right-to-left, alternating.
Input: the first line has N and M; the next N lines each have M integers.
Output: all values in snake order on one line.
Constraints:
- 1 ≤ N, M ≤ 100
Sample Tests
Input 1
3 3 1 2 3 4 5 6 7 8 9
Output 1
1 2 3 6 5 4 7 8 9
Input 2
1 2 1 2
Output 2
1 2
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