Square a number
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
Set the array elements whose value is 13 to 0
Find nth maximum
2倍してみよう - ここからスタート！
Create a Matrix of Zeros
Find the area of a triangle
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