2025-02-20 v. 8.6.5: added "1481. Least Number of Unique Integers after K Removals"

Author: fartem

README.md

@@ -698,6 +698,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1457. Pseudo-Palindromic Paths in a Binary Tree                                     | [Link](https://leetcode.com/problems/pseudo-palindromic-paths-in-a-binary-tree/)                                     | [Link](./lib/medium/1457_pseudo_palindromic_paths_in_a_binary_tree.rb)                                     | [Link](./test/medium/test_1457_pseudo_palindromic_paths_in_a_binary_tree.rb)                                     |
 | 1461. Check If a String Contains All Binary Codes of Size K                         | [Link](https://leetcode.com/problems/check-if-a-string-contains-all-binary-codes-of-size-k/)                         | [Link](./lib/medium/1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb)                         | [Link](./test/medium/test_1461_check_if_a_string_contains_all_binary_codes_of_size_k.rb)                         |
 | 1472. Design Browser History                                                        | [Link](https://leetcode.com/problems/design-browser-history/)                                                        | [Link](./lib/medium/1472_design_browser_history.rb)                                                        | [Link](./test/medium/test_1472_design_browser_history.rb)                                                        |
+| 1481. Least Number of Unique Integers after K Removals                              | [Link](https://leetcode.com/problems/least-number-of-unique-integers-after-k-removals/)                              | [Link](./lib/medium/1481_least_number_of_unique_integers_after_k_removals.rb)                              | [Link](./test/medium/test_1481_least_number_of_unique_integers_after_k_removals.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)                                                   |
 | 2429. Minimize XOR                                                                  | [Link](https://leetcode.com/problems/minimize-xor/)                                                                  | [Link](./lib/medium/2429_minimize_xor.rb)                                                                  | [Link](./test/medium/test_2429_minimize_xor.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 = '8.6.4'
+  s.version = '8.6.5'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1481_least_number_of_unique_integers_after_k_removals.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/least-number-of-unique-integers-after-k-removals/
+# @param {Integer[]} arr
+# @param {Integer} k
+# @return {Integer}
+def find_least_num_of_unique_ints(arr, k)
+  nums_with_count = ::Hash.new(0).tap { |h| arr.each { |num| h[num] += 1 } }
+  to_sort = nums_with_count.values.sort
+
+  count = 0
+  p = 0
+
+  while k.positive?
+    c = to_sort[p]
+
+    count += 1 if k >= c
+
+    k -= c
+    p += 1
+  end
+
+  nums_with_count.size - count
+end

test/medium/test_1481_least_number_of_unique_integers_after_k_removals.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/1481_least_number_of_unique_integers_after_k_removals'
+require 'minitest/autorun'
+
+class LeastNumberOfUniqueIntegersAfterKRemovalsTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      1,
+      find_least_num_of_unique_ints(
+        [5, 5, 4],
+        1
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      2,
+      find_least_num_of_unique_ints(
+        [4, 3, 1, 1, 3, 3, 2],
+        3
+      )
+    )
+  end
+end