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  1.  
  2. def main():
  3. with open("input.txt") as f:
  4. stream = list(f.read())
  6. valid_characters = ['{', '}']
  7. filtered_stream = []
  8. state = True
  10. for index, char in enumerate(stream):
  11. if char == '<' and isnt_not(index, stream):
  12. state = False
  14. if state == True and char in valid_characters:
  15. filtered_stream.append(char)
  17. if char == '>' and isnt_not(index, stream):
  18. state = True
  20. print(get_score(filtered_stream))
  23. def isnt_not(index, stream):
  24. '''Check if the previous characters cancel the current character'''
  25. if stream[index - 1] != '!':
  26. return True
  27. else:
  28. i = 0
  29. while stream[(index - 1) - i] == '!':
  30. i += 1
  31. return i % 2 == 0
  34. def get_score(filtered_stream):
  35. '''return total score from list of brackets'''
  36. score, m = 0, 0
  37. for char in filtered_stream:
  38. if char == '{':
  39. m += 1
  40. score += m
  41. elif char == '}':
  42. m -= 1
  43. return score
  46. if __name__ == '__main__':
  47. main()
  48.  
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