Problem 2157. Multiplication

 x = [ 1 2 0 1 ]

 y = [ 8 5 1 ]

      1  2  0  1
 X       8  5  1
-------------------
      1  2  0  1
   5 10  0  5
8 16  0  8
----------------
8 21 11 10  5  1 

Solution Comments

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