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"""
Unique Morse Code Representations
Given a list of words, determine the number of unique Morse code
transformations among all the words.
Reference: https://leetcode.com/problems/unique-morse-code-words/
Complexity:
Time: O(n * k) where n is the number of words, k is average word length
Space: O(n)
"""
from __future__ import annotations
_MORSE_CODE = {
"a": ".-",
"b": "-...",
"c": "-.-.",
"d": "-..",
"e": ".",
"f": "..-.",
"g": "--.",
"h": "....",
"i": "..",
"j": ".---",
"k": "-.-",
"l": ".-..",
"m": "--",
"n": "-.",
"o": "---",
"p": ".--.",
"q": "--.-",
"r": ".-.",
"s": "...",
"t": "-",
"u": "..-",
"v": "...-",
"w": ".--",
"x": "-..-",
"y": "-.--",
"z": "--..",
}
def convert_morse_word(word: str) -> str:
"""Convert a word to its Morse code representation.
Args:
word: The word to convert (case-insensitive).
Returns:
The Morse code string for the word.
Examples:
>>> convert_morse_word("gin")
'--...-.'
"""
morse_word = ""
word = word.lower()
for char in word:
morse_word = morse_word + _MORSE_CODE[char]
return morse_word
def unique_morse(words: list[str]) -> int:
"""Count the number of unique Morse code transformations.
Args:
words: A list of words to transform and count.
Returns:
The number of distinct Morse code representations.
Examples:
>>> unique_morse(["gin", "zen", "gig", "msg"])
2
"""
unique_transformations: list[str] = []
for word in words:
morse_word = convert_morse_word(word)
if morse_word not in unique_transformations:
unique_transformations.append(morse_word)
return len(unique_transformations)