Unfold a 2-D matrix to a 1-D array in zig-zag order, e.g., for matrix
[ 1 2 3 ;
4 5 6 ;
7 8 9 ]
the resulting 1-D array should be
[ 1 2 4 7 5 3 6 8 9 ]
Replicate elements in vectors
Sum the Digits of a Number
Create Volcano (or Atoll) martix. It is an extension of Bullseye matrix problem.
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