Do you mean "Coordinates in matrix are arranged in counter-clockwise direction"?
Yes. They are assumed to be in counter clockwise to match up with the test suites. Thanks. I have updated the definition.
Additional test cases have been added.
Arrange Vector in descending order
Insert zeros into vector
2倍してみよう - ここからスタート！
Area of a circle
Find elements of set A those are not in set B
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