2025-02-07 v. 8.4.7: added "1338. Reduce Array Size to The Half"

Author: fartem

README.md

@@ -679,6 +679,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1315. Sum of Nodes with Even-Valued Grandparent                  | [Link](https://leetcode.com/problems/sum-of-nodes-with-even-valued-grandparent/)                   | [Link](./lib/medium/1315_sum_of_nodes_with_even_valued_grandparent.rb)                  | [Link](./test/medium/test_1315_sum_of_nodes_with_even_valued_grandparent.rb)                  |
 | 1325. Delete Leaves With a Given Value                           | [Link](https://leetcode.com/problems/delete-leaves-with-a-given-value/)                            | [Link](./lib/medium/1325_delete_leaves_with_a_given_value.rb)                           | [Link](./test/medium/test_1325_delete_leaves_with_a_given_value.rb)                           |
 | 1329. Sort the Matrix Diagonally                                 | [Link](https://leetcode.com/problems/sort-the-matrix-diagonally/)                                  | [Link](./lib/medium/1329_sort_the_matrix_diagonally.rb)                                 | [Link](./test/medium/test_1329_sort_the_matrix_diagonally.rb)                                 |
+| 1338. Reduce Array Size to The Half                              | [Link](https://leetcode.com/problems/reduce-array-size-to-the-half/)                               | [Link](./lib/medium/1338_reduce_array_size_to_the_half.rb)                              | [Link](./test/medium/test_1338_reduce_array_size_to_the_half.rb)                              |
 | 1400. Construct K Palindrome Strings                             | [Link](https://leetcode.com/problems/construct-k-palindrome-strings/)                              | [Link](./lib/medium/1400_construct_k_palindrome_strings.rb)                             | [Link](./test/medium/test_1400_construct_k_palindrome_strings.rb)                             |
 | 2116. Check if a Parentheses String Can Be Valid                 | [Link](https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/)                  | [Link](./lib/medium/2116_check_if_a_parentheses_string_can_be_valid.rb)                 | [Link](./test/medium/test_2116_check_if_a_parentheses_string_can_be_valid.rb)                 |
 | 2425. Bitwise XOR of All Pairings                                | [Link](https://leetcode.com/problems/bitwise-xor-of-all-pairings/)                                 | [Link](./lib/medium/2425_bitwise_xor_of_all_pairings.rb)                                | [Link](./test/medium/test_2425_bitwise_xor_of_all_pairings.rb)                                |

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 = '8.4.6'
+  s.version = '8.4.7'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1338_reduce_array_size_to_the_half.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/reduce-array-size-to-the-half/
+# @param {Integer[]} arr
+# @return {Integer}
+def min_set_size(arr)
+  return 1 if arr.size < 3
+
+  frequency_map = ::Hash.new(0)
+  arr.each { |num| frequency_map[num] += 1 }
+
+  max_heap = frequency_map.values.sort.reverse
+
+  r = 0
+  result = 0
+
+  while r < arr.size / 2 && !max_heap.empty?
+    r += max_heap.shift
+    result += 1
+  end
+
+  result
+end

test/medium/test_1329_sort_the_matrix_diagonally.rb

@@ -5,7 +5,7 @@
 require 'minitest/autorun'
 
 class SortTheMatrixDiagonallyTest < ::Minitest::Test
-  def test_diagonal_sort_small_matrix
+  def test_default_one
     assert_equal(
       [
         [1, 1, 1, 1],
@@ -22,7 +22,7 @@ def test_diagonal_sort_small_matrix
     )
   end
 
-  def test_diagonal_sort_large_matrix
+  def test_default_two
     assert_equal(
       [
         [5, 17, 4, 1, 52, 7],

test/medium/test_1338_reduce_array_size_to_the_half.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1338_reduce_array_size_to_the_half'
+require 'minitest/autorun'
+
+class ReduceArraySizeToTheHalfTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      2,
+      min_set_size(
+        [3, 3, 3, 3, 5, 5, 5, 2, 2, 7]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      1,
+      min_set_size(
+        [7, 7, 7, 7, 7, 7]
+      )
+    )
+  end
+end