Sum the numbers on the main diagonal
Maximum value in a matrix
Is this triangle right-angled?
2倍してみよう - ここからスタート！
Find the Oldest Person in a Room
Draw a '5' in a zero matrix!
Draw a '7' in a zero matrix!
Draw a '3' in a zero matrix!
Draw a '2' in a zero matrix!
Draw a '1' in a zero matrix!
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