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fartemfartem
authoredJul 9, 2024
Merge pull request #666 from fartem/34_Find_First_and_Last_Position_of_Element_in_Sorted_Array
2024-07-09 v. 6.0.9: added "34. Find First and Last Position of Element in Sorted Array"
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‎README.md

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@@ -457,20 +457,21 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
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### Medium
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| Name | Link to LeetCode | Link to solution |
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|---------------------------------------------------|---------------------------------------------------------------------------------------|--------------------------------------------------------------------------|
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| 2. Add Two Numbers | [Link](https://leetcode.com/problems/add-two-numbers/) | [Link](./lib/medium/2_add_two_numbers.rb) |
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| 3. Longest Substring Without Repeating Characters | [Link](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [Link](./lib/medium/3_longest_substring_without_repeating_characters.rb) |
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| 5. Longest Palindromic Substring | [Link](https://leetcode.com/problems/longest-palindromic-substring/) | [Link](./lib/medium/5_longest_palindromic_substring.rb) |
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| 7. Reverse Integer | [Link](https://leetcode.com/problems/reverse-integer/) | [Link](./lib/medium/7_reverse_integer.rb) |
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| 8. String to Integer (atoi) | [Link](https://leetcode.com/problems/string-to-integer-atoi/) | [Link](./lib/medium/8_string_to_integer_atoi.rb) |
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| 11. Container With Most Water | [Link](https://leetcode.com/problems/container-with-most-water/) | [Link](./lib/medium/11_container_with_most_water.rb) |
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| 12. Integer to Roman | [Link](https://leetcode.com/problems/integer-to-roman/) | [Link](./lib/medium/12_integer_to_roman.rb) |
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| 15. 3Sum | [Link](https://leetcode.com/problems/3sum/) | [Link](./lib/medium/15_3sum.rb) |
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| 16. 3Sum Closest | [Link](https://leetcode.com/problems/3sum-closest/) | [Link](./lib/medium/16_3sum_closest.rb) |
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| 17. Letter Combinations of a Phone Number | [Link](https://leetcode.com/problems/letter-combinations-of-a-phone-number/) | [Link](./lib/medium/17_letter_combinations_of_a_phone_number.rb) |
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| 19. Remove Nth Node From End of List | [Link](https://leetcode.com/problems/remove-nth-node-from-end-of-list/) | [Link](./lib/medium/19_remove_nth_node_from_end_of_list.rb) |
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| 22. Generate Parentheses | [Link](https://leetcode.com/problems/generate-parentheses/) | [Link](./lib/medium/22_generate_parentheses.rb) |
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| 24. Swap Nodes in Pairs | [Link](https://leetcode.com/problems/swap-nodes-in-pairs/) | [Link](./lib/medium/24_swap_nodes_in_pairs.rb) |
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| 29. Divide Two Integers | [Link](https://leetcode.com/problems/divide-two-integers/) | [Link](./lib/medium/29_divide_two_integers.rb) |
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| 33. Search in Rotated Sorted Array | [Link](https://leetcode.com/problems/search-in-rotated-sorted-array/) | [Link](./lib/medium/33_search_in_rotated_sorted_array.rb) |
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| Name | Link to LeetCode | Link to solution |
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|-------------------------------------------------------------|------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------|
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| 2. Add Two Numbers | [Link](https://leetcode.com/problems/add-two-numbers/) | [Link](./lib/medium/2_add_two_numbers.rb) |
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| 3. Longest Substring Without Repeating Characters | [Link](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [Link](./lib/medium/3_longest_substring_without_repeating_characters.rb) |
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| 5. Longest Palindromic Substring | [Link](https://leetcode.com/problems/longest-palindromic-substring/) | [Link](./lib/medium/5_longest_palindromic_substring.rb) |
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| 7. Reverse Integer | [Link](https://leetcode.com/problems/reverse-integer/) | [Link](./lib/medium/7_reverse_integer.rb) |
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| 8. String to Integer (atoi) | [Link](https://leetcode.com/problems/string-to-integer-atoi/) | [Link](./lib/medium/8_string_to_integer_atoi.rb) |
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| 11. Container With Most Water | [Link](https://leetcode.com/problems/container-with-most-water/) | [Link](./lib/medium/11_container_with_most_water.rb) |
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| 12. Integer to Roman | [Link](https://leetcode.com/problems/integer-to-roman/) | [Link](./lib/medium/12_integer_to_roman.rb) |
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| 15. 3Sum | [Link](https://leetcode.com/problems/3sum/) | [Link](./lib/medium/15_3sum.rb) |
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| 16. 3Sum Closest | [Link](https://leetcode.com/problems/3sum-closest/) | [Link](./lib/medium/16_3sum_closest.rb) |
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| 17. Letter Combinations of a Phone Number | [Link](https://leetcode.com/problems/letter-combinations-of-a-phone-number/) | [Link](./lib/medium/17_letter_combinations_of_a_phone_number.rb) |
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| 19. Remove Nth Node From End of List | [Link](https://leetcode.com/problems/remove-nth-node-from-end-of-list/) | [Link](./lib/medium/19_remove_nth_node_from_end_of_list.rb) |
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| 22. Generate Parentheses | [Link](https://leetcode.com/problems/generate-parentheses/) | [Link](./lib/medium/22_generate_parentheses.rb) |
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| 24. Swap Nodes in Pairs | [Link](https://leetcode.com/problems/swap-nodes-in-pairs/) | [Link](./lib/medium/24_swap_nodes_in_pairs.rb) |
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| 29. Divide Two Integers | [Link](https://leetcode.com/problems/divide-two-integers/) | [Link](./lib/medium/29_divide_two_integers.rb) |
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| 33. Search in Rotated Sorted Array | [Link](https://leetcode.com/problems/search-in-rotated-sorted-array/) | [Link](./lib/medium/33_search_in_rotated_sorted_array.rb) |
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| 34. Find First and Last Position of Element in Sorted Array | [Link](https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/) | [Link](./lib/medium/34_find_first_and_last_position_of_element_in_sorted_array.rb) |

‎leetcode-ruby.gemspec

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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 = '6.0.8'
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s.version = '6.0.9'
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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'

‎lib/medium/34_find_first_and_last_position_of_element_in_sorted_array.rb

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# frozen_string_literal: true
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# https://leetcode.com/problems/find-first-and-last-position-of-element-in-sorted-array/
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# @param {Integer[]} nums
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# @param {Integer} target
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# @return {Integer[]}
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def search_range(nums, target)
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h = nums.length - 1
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s = find_start(nums, target, 0, h)
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return [-1, -1] if s == -1
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e = find_end(nums, target, 0, h)
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[s, e]
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end
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# @param {Integer[]} nums
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# @param {Integer} target
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# @param {Integer} l
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# @param {Integer} h
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# @return {Integer}
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def find_start(nums, target, l, h)
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return -1 if h < l
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m = l + (h - l) / 2
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num = nums[m]
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return m if (m.zero? || target > nums[m - 1]) && num == target
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target > num ? find_start(nums, target, m + 1, h) : find_start(nums, target, l, m - 1)
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end
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# @param {Integer[]} nums
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# @param {Integer} target
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# @param {Integer} l
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# @param {Integer} h
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# @return {Integer}
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def find_end(nums, target, l, h)
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return -1 if h < l
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m = l + (h - l) / 2
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num = nums[m]
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return m if (m == nums.length - 1 || target < nums[m + 1]) && num == target
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target < num ? find_end(nums, target, l, m - 1) : find_end(nums, target, m + 1, h)
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end

‎test/medium/test_34_find_first_and_last_position_of_element_in_sorted_array.rb

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# frozen_string_literal: true
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require_relative '../test_helper'
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require_relative '../../lib/medium/34_find_first_and_last_position_of_element_in_sorted_array'
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require 'minitest/autorun'
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class SearchInRotatedSortedArrayTest < ::Minitest::Test
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def test_default
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assert_equal([3, 4], search_range([5, 7, 7, 8, 8, 10], 8))
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assert_equal([-1, -1], search_range([5, 7, 7, 8, 8, 10], 6))
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assert_equal([-1, -1], search_range([], 0))
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end
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end

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