Problem 44101. Adaptive ZigZag

 [ 1 2 5 6;
   3 4 7 8;
   9 10 13 14;
   11 12 15 16] 

 [ 1 5 9 13 2 3 4 6 7 8 10 11 12 14 15 16]

Solution Comments

Problem Recent Solvers13

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