Nice problem! Per Solution 1536525 I think you can safely increase the number of iterations in the Test Suite to 1000 or 2000. You could also add a second case, identical to the first except choosing L randomly. —DIV
Tip. This is called Game of Nim. https://en.wikipedia.org/wiki/Nim
2倍してみよう - ここからスタート！
Find the starting index of a consecutive condition
Draw 'O' !
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