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Update data_structures/arrays/strings/palindrome.rb

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Vitor Oliveira 2021-04-09 21:07:57 -07:00 committed by GitHub
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data_structures/arrays/strings/palindrome.rb
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@ -47,7 +47,17 @@ puts is_palindrome(s)
#
# Approach 2: Reversed array
#
# Time Complexity: O(n)
# Complexity Analysis:
#
# Time Complexity: O(n), in length n of the string.
#
# We need to iterate through the string: When we filter out non-alphanumeric characters and convert the remaining
# characters to lower-case. When we reverse the string. When we compare the original and the reversed strings.
# Each iteration runs linearly in time (since each character operation completes in constant time).
# Thus, the effective run-time complexity is linear.
#
# Space Complexity: O(n), in length n of the string. We need O(n) additional
# space to store the filtered string and the reversed string.
#
def is_palindrome(s)
letters_only_array = s.downcase.gsub(/[^0-9a-z]/i, '').split('')