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  1. import operator
  2.  
  3. def max_saw(arr):
  4. 	if len(arr) < 3:
  5. 		return len(arr)
  6. 	n, nmax = 2, 2
  7. 	for i in range(2, len(arr)):
  8. 		if (arr[i] > arr[i-1]) ^ (arr[i-1] > arr[i-2]):
  9. 			n += 1
  10. 		else:
  11. 			n = 2
  12. 		if n > nmax:
  13. 			nmax = n
  14. 	return nmax
  15.  
  16. def max_saw_op(arr):
  17. 	if len(arr) < 3:
  18. 		return len(arr)
  19. 	n, nmax = 2, 2
  20. 	ops = [operator.gt, operator.lt]
  21. 	op = ops[arr[1] > arr[0]]
  22. 	for i in range(2, len(arr)):
  23. 		if op(arr[i], arr[i-1]):
  24. 			n += 1
  25. 			op = ops[1 - ops.index(op)]
  26. 		else:
  27. 			op = ops[arr[i] > arr[i-1]]
  28. 			n = 2
  29. 		if n > nmax:
  30. 			nmax = n
  31. 	return nmax
  32.  
  33. def max_saw_min(arr):
  34. 	n, nmax = 2, 2
  35. 	for i in range(2, len(arr)):
  36. 		n = n + 1 if (arr[i] > arr[i-1]) ^ (arr[i-1] > arr[i-2]) else 2
  37. 		nmax = max(n, nmax)
  38. 	return nmax
  39.  
  40. print(max_saw([1,2,3]), end=" ")
  41. print(max_saw([5, 7, 6, 3, 4, 2, 7, 1, 8, 9, 4, 5]), end=" ")
  42. print(max_saw([1, -2, 3, -4, 5]))
  43. print(max_saw_op([1,2,3]), end=" ")
  44. print(max_saw_op([5, 7, 6, 3, 4, 2, 7, 1, 8, 9, 4, 5]), end=" ")
  45. print(max_saw_op([1, -2, 3, -4, 5]))
  46. print(max_saw_min([1,2,3]), end=" ")
  47. print(max_saw_min([5, 7, 6, 3, 4, 2, 7, 1, 8, 9, 4, 5]), end=" ")
  48. print(max_saw_min([1, -2, 3, -4, 5]))
Success #stdin #stdout 0.01s 9992KB
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2 7 5
2 7 5
2 7 5
https://ideone.com/SJZ9dk
language:
Python 3 (python  3.9.5)
created:
7 years ago
visibility:
secret

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