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2025-04-17 v. 9.2.8: added "3083. Existence of a Substring in a String and Its Reverse" #1017

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1 change: 1 addition & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -455,6 +455,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
| 2549. Count Distinct Numbers on Board | [Link](https://leetcode.com/problems/count-distinct-numbers-on-board/) | [Link](./lib/easy/2549_count_distinct_numbers_on_board.rb) | [Link](./test/easy/test_2549_count_distinct_numbers_on_board.rb) |
| 2652. Sum Multiples | [Link](https://leetcode.com/problems/sum-multiples/) | [Link](./lib/easy/2652_sum_multiples.rb) | [Link](./test/easy/test_2652_sum_multiples.rb) |
| 2974. Minimum Number Game | [Link](https://leetcode.com/problems/minimum-number-game/) | [Link](./lib/easy/2974_minimum_number_game.rb) | [Link](./test/easy/test_2974_minimum_number_game.rb) |
| 3083. Existence of a Substring in a String and Its Reverse | [Link](https://leetcode.com/problems/existence-of-a-substring-in-a-string-and-its-reverse/) | [Link](./lib/easy/3083_existence_of_a_substring_in_a_string_and_its_reverse.rb) | [Link](./test/easy/test_3083_existence_of_a_substring_in_a_string_and_its_reverse.rb) |
| 3110. Score of a String | [Link](https://leetcode.com/problems/score-of-a-string/) | [Link](./lib/easy/3110_score_of_a_string.rb) | [Link](./test/easy/test_3110_score_of_a_string.rb) |
| 3136. Valid Word | [Link](https://leetcode.com/problems/valid-word/) | [Link](./lib/easy/3136_valid_word.rb) | [Link](./test/easy/test_3136_valid_word.rb) |
| 3151. Special Array I | [Link](https://leetcode.com/problems/special-array-i/) | [Link](./lib/easy/3151_special_array_i.rb) | [Link](./test/easy/test_3151_special_array_i.rb) |
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2 changes: 1 addition & 1 deletion leetcode-ruby.gemspec
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ require 'English'
::Gem::Specification.new do |s|
s.required_ruby_version = '>= 3.0'
s.name = 'leetcode-ruby'
s.version = '9.2.7'
s.version = '9.2.8'
s.license = 'MIT'
s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
s.executable = 'leetcode-ruby'
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
# frozen_string_literal: true

# https://leetcode.com/problems/existence-of-a-substring-in-a-string-and-its-reverse/
# @param {String} s
# @return {Boolean}
def is_substring_present(s)
return false if s.size < 2

rev = s.reverse
subs = []

(0..s.length - 2).each do |i|
subs << s[i, 2]
end

subs.any? { |sub| rev.include?(sub) }
end
Original file line number Diff line number Diff line change
@@ -0,0 +1,31 @@
# frozen_string_literal: true

require_relative '../test_helper'
require_relative '../../lib/easy/3083_existence_of_a_substring_in_a_string_and_its_reverse'
require 'minitest/autorun'

class ExistenceOfASubstringInAStringAndItsReverseTest < ::Minitest::Test
def test_default_one
assert(
is_substring_present(
'leetcode'
)
)
end

def test_default_two
assert(
is_substring_present(
'abcba'
)
)
end

def test_default_three
assert(
!is_substring_present(
'abcd'
)
)
end
end