First N Perfect Squares
Back to basics 4 - Search Path
Rotate input square matrix 90 degrees CCW without rot90
2倍してみよう - ここからスタート！
Create a Matrix of Zeros
Back and Forth Rows
Replace NaNs with the number that appears to its left in the row.
Find the longest sequence of 1's in a binary sequence.
Reverse Run-Length Encoder
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