I would recommend more test cases, including some of matrices.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Find the sum of all the numbers of the input vector
Which doors are open?
Switch matrix to a column vector
Create a two dimensional zero matrix
2倍してみよう - ここからスタート！
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