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Merge pull request #606 from fartem/2309_Greatest_English_Letter_in_Upper_and_Lower_Case
2024-04-18 v. 5.4.9: added "2309. Greatest English Letter in Upper and Lower Case"
2 parents 0200a73 + a8384a1 commit c31a304

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README.md

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@@ -409,3 +409,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
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| 2293. Min Max Game | [Link](https://leetcode.com/problems/min-max-game/) | [Link](./lib/easy/2293_min_max_game.rb) |
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| 2299. Strong Password Checker II | [Link](https://leetcode.com/problems/strong-password-checker-ii/) | [Link](./lib/easy/2299_strong_password_checker_ii.rb) |
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| 2303. Calculate Amount Paid in Taxes | [Link](https://leetcode.com/problems/calculate-amount-paid-in-taxes/) | [Link](./lib/easy/2303_calculate_amount_paid_in_taxes.rb) |
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| 2309. Greatest English Letter in Upper and Lower Case | [Link](https://leetcode.com/problems/greatest-english-letter-in-upper-and-lower-case/) | [Link](./lib/easy/2309_greatest_english_letter_in_upper_and_lower_case.rb) |

leetcode-ruby.gemspec

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@@ -5,7 +5,7 @@ require 'English'
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::Gem::Specification.new do |s|
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s.required_ruby_version = '>= 3.0'
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s.name = 'leetcode-ruby'
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s.version = '5.4.8'
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s.version = '5.4.9'
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s.license = 'MIT'
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s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
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s.executable = 'leetcode-ruby'
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# frozen_string_literal: true
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# https://leetcode.com/problems/greatest-english-letter-in-upper-and-lower-case/
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# @param {String} s
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# @return {String}
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def greatest_letter(s)
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upper = {}
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lower = {}
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s.each_char do |c|
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if c.match?(/[[:upper:]]/)
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upper[c] = upper.fetch(c, 0) + 1
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else
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lower[c] = lower.fetch(c, 0) + 1
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end
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end
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'ZYXWVUTSRQPONMLKJIHGFEDCBA'.each_char do |c|
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return c if upper.fetch(c, 0).positive? && lower.fetch(c.downcase, 0).positive?
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end
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''
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end
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# frozen_string_literal: true
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require_relative '../test_helper'
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require_relative '../../lib/easy/2309_greatest_english_letter_in_upper_and_lower_case'
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require 'minitest/autorun'
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class GreatestEnglishLetterInUpperAndLowerCaseTest < ::Minitest::Test
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def test_default
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assert_equal('E', greatest_letter('lEeTcOdE'))
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assert_equal('R', greatest_letter('arRAzFif'))
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assert_equal('', greatest_letter('AbCdEfGhIjK'))
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end
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end

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