59 lines
1.4 KiB
Python
59 lines
1.4 KiB
Python
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# Python!
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import collections
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# Count occurences of a letter in a string (excluding dashes)
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# and return a list of the five most frequent, sorted first
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# by frequency (desc) and then alphabetically( asc)
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def letter_frequency(string):
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letter_counts = collections.defaultdict(int)
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for char in string.replace('-', ''):
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letter_counts[char] += 1
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sortable = []
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for count in letter_counts:
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sortable.append([count, letter_counts[count]])
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sortable = sorted(sortable, key=lambda x: x[0])
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sortable = sorted(sortable, key=lambda x: x[1], reverse=True)
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frequencies = ''
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for n in range(5):
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frequencies += sortable[n][0]
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return frequencies
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# Alphabetically shift each letter in the encrypted room name
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# by the sector #; replace dashes with spaces
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def decrypt(room_data):
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alphabet = collections.deque('abcdefghijklmnopqrstuvwxyz')
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decrypted = ''
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for char in room_data['letters']:
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if char == '-':
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decrypted += ' '
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else:
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i = alphabet.index(char)
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alphabet.rotate(-1 * room_data['sector'])
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decrypted += alphabet[i]
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return (decrypted, room_data['sector'])
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with open('04.txt') as file:
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lines = file.read().splitlines()
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rooms = []
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for line in lines:
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data = {
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'letters': line[:-11],
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'sector': int(line[-10:-7]),
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'most_common': line[-6:-1],
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}
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if letter_frequency(data['letters']) == data['most_common']:
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rooms.append(decrypt(data))
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rooms.sort(key=lambda k: k[0])
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for room in rooms:
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print(room)
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