Read two non-zero natural numbers n and m and print a matrix with n rows and m columns filled with consecutive natural numbers starting from 1, in a snake pattern as shown in the example.
On rows with an even index (the first, the third, ...) the numbers increase from left to right. On rows with an odd index (the second, the fourth, ...) the numbers increase from right to left, continuing the count.
The program reads from standard input two natural numbers, `n` and `m`, separated by a space. - `1 <= n, m <= 50`
The program prints to standard output the constructed matrix, with values on the same row separated by single spaces, one matrix row per output line.
4 5
1 2 3 4 5 10 9 8 7 6 11 12 13 14 15 20 19 18 17 16
4 5
1 2 3 4 5 10 9 8 7 6 11 12 13 14 15 20 19 18 17 16
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4 5
1 2 3 4 5 10 9 8 7 6 11 12 13 14 15 20 19 18 17 16
4 5
1 2 3 4 5 10 9 8 7 6 11 12 13 14 15 20 19 18 17 16
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