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 ]
Solve

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Last Solution submitted on Aug 18, 2026

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wsf Echo Oliver 李大地

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