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  1. #
  2. from itertools import tee, islice, groupby
  3.  
  4. def inversions(it):
  5. 	a, b = tee(it)
  6. 	return sum(1 for _ in islice(
  7. 		groupby(x >= y for x, y in zip(a, islice(b, 1, None))), 1, None
  8. 	))
  9.  
  10. print( *map(inversions, ((1, 2, 5, 3, 4, 7, 6),
  11. 						 (0, 1, 2, 3),
  12. 						 (4, 3, 2, 1, 0, 1)
  13. 						 )),
  14. 		sep='\n'
  15. )
  16.  
Success #stdin #stdout 0.02s 8688KB
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https://ideone.com/VMlxzH
language:
Python 3 (python  3.9.5)
created:
9 years ago
visibility:
public

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