2025-01-03 v. 7.6.8.1: small refactoring

Author: fartem

leetcode-ruby.gemspec

@@ -5,7 +5,7 @@ require 'English'
 ::Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.0'
   s.name = 'leetcode-ruby'
-  s.version = '7.6.8'
+  s.version = '7.6.8.1'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/easy/136_single_number.rb

@@ -4,7 +4,5 @@
 # @param {Integer[]} nums
 # @return {Integer}
 def single_number(nums)
-  count = nums.each_with_object(::Hash.new(0)) { |elem, acc| acc[elem] += 1 }
-
-  count.find { |_key, value| value == 1 }&.first
+  nums.tally.find { |_key, value| value == 1 }&.first
 end

lib/easy/1512_number_of_good_pairs.rb

@@ -5,7 +5,7 @@
 # @return {Integer}
 def num_identical_pairs(nums)
   nums
-    .each_with_object(::Hash.new(0)) { |elem, acc| acc[elem] += 1 }
+    .tally
     .values
     .reduce(0) { |acc, elem| acc + elem * (elem - 1) / 2 }
 end

lib/easy/2053_kth_distinct_string_in_an_array.rb

@@ -5,8 +5,7 @@
 # @param {Integer} k
 # @return {String}
 def kth_distinct(arr, k)
-  values = arr.each_with_object(::Hash.new(0)) { |elem, acc| acc[elem] += 1 }
-  values.each do |key, value|
+  arr.tally.each do |key, value|
     next unless value == 1
 
     return key if k == 1

lib/easy/2085_count_common_words_with_one_occurrence.rb

@@ -5,8 +5,8 @@
 # @param {String[]} words2
 # @return {Integer}
 def count_words(words1, words2)
-  w1 = words1.each_with_object(::Hash.new(0)) { |elem, acc| acc[elem] += 1; }
-  w2 = words2.each_with_object(::Hash.new(0)) { |elem, acc| acc[elem] += 1; }
+  w1 = words1.tally
+  w2 = words2.tally
 
   w1.entries.sum { |entry| entry.last == 1 && w2[entry.first] == 1 ? 1 : 0 }
 end

lib/easy/350_intersection_of_two_arrays_ii.rb

@@ -5,11 +5,11 @@
 # @param {Integer[]} nums2
 # @return {Integer[]}
 def intersect(nums1, nums2)
-  nums1_c = nums1.each_with_object(::Hash.new(0)) { |elem, acc| acc[elem] += 1 }
+  nums1_c = nums1.tally
 
   result = []
   nums2.each do |num|
-    next if nums1_c[num].zero?
+    next if !nums1_c[num] || nums1_c[num].zero?
 
     result << num
     nums1_c[num] -= 1

lib/medium/692_top_k_frequent_words.rb

@@ -5,7 +5,7 @@
 # @param {Integer} k
 # @return {String[]}
 def top_k_frequent_words(words, k)
-  values = words.each_with_object(::Hash.new(0)) { |e, total| total[e] += 1; }
+  values = words.tally
 
   to_sort = values.to_a
   to_sort.sort! do |a, b|