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from typing import List
import attr
@attr.s(auto_attribs=True)
class Shortener:
@staticmethod
def normalize(string: str) -> str:
result = ''
for char in string:
if char.lower() not in 'qwertyuiopasdfghjklzxcvbnm1234567890':
continue
result += char.lower()
return result
@staticmethod
def get_min_symbols_to_uniq(strings: List[str]) -> int:
symbol_counter = 1
longest_item_length = Shortener.get_longest_item_length(strings)
string_list = [
string_item[0:symbol_counter].lower()
for string_item in strings
]
while symbol_counter < longest_item_length \
and Shortener.are_there_duplicates(string_list):
symbol_counter += 1
string_list = [
string_item[0:symbol_counter].lower()
for string_item in strings
]
return symbol_counter
@staticmethod
def are_there_duplicates(list_):
set_ = set()
for elem in list_:
if elem in set_:
return True
else:
set_.add(elem)
return False
@staticmethod
def get_longest_item_length(list_: List[str]) -> int:
longest = 0
for string in list_:
length = len(string)
if length > longest:
longest = length
return longest