The Problem it is not challenging if the solution is provided openly in the Test Suite. See Problems 44617, 44616 & 44521 for discussion of some relevant details.
The solution is openly provided. Please change the test suite.
Getting the row and column location from a matrix
2倍してみよう - ここからスタート！
Determine the length of a string of characters
Beginner's Problem - Squaring
Area of a circle
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