From 1308a24afe1f12ff68186707fac3f2828e214c2a Mon Sep 17 00:00:00 2001
From: fartem <jaman.smlnsk@gmail.com>
Date: Fri, 3 May 2024 06:35:50 +0300
Subject: [PATCH] 2024-05-03 v. 5.6.0: added "2367. Number of Arithmetic
 Triplets"

---
 README.md                                            |  1 +
 leetcode-ruby.gemspec                                |  2 +-
 lib/easy/2367_number_of_arithmetic_triplets.rb       | 12 ++++++++++++
 test/easy/test_2367_number_of_arithmetic_triplets.rb | 12 ++++++++++++
 4 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 lib/easy/2367_number_of_arithmetic_triplets.rb
 create mode 100644 test/easy/test_2367_number_of_arithmetic_triplets.rb

diff --git a/README.md b/README.md
index f98a4a94..3dc416b3 100644
--- a/README.md
+++ b/README.md
@@ -420,3 +420,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 2351. First Letter to Appear Twice                                 | [Link](https://leetcode.com/problems/first-letter-to-appear-twice/)                                 | [Link](./lib/easy/2351_first_letter_to_appear_twice.rb)                                 |
 | 2357. Make Array Zero by Subtracting Equal Amounts                 | [Link](https://leetcode.com/problems/make-array-zero-by-subtracting-equal-amounts/)                 | [Link](./lib/easy/2357_make_array_zero_by_subtracting_equal_amounts.rb)                 |
 | 2363. Merge Similar Items                                          | [Link](https://leetcode.com/problems/merge-similar-items/)                                          | [Link](./lib/easy/2363_merge_similar_items.rb)                                          |
+| 2367. Number of Arithmetic Triplets                                | [Link](https://leetcode.com/problems/number-of-arithmetic-triplets/)                                | [Link](./lib/easy/2367_number_of_arithmetic_triplets.rb)                                |
diff --git a/leetcode-ruby.gemspec b/leetcode-ruby.gemspec
index 1e52d835..3d2a891b 100644
--- a/leetcode-ruby.gemspec
+++ b/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 = '5.5.9'
+  s.version = '5.6.0'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
   s.executable = 'leetcode-ruby'
diff --git a/lib/easy/2367_number_of_arithmetic_triplets.rb b/lib/easy/2367_number_of_arithmetic_triplets.rb
new file mode 100644
index 00000000..afb2ff8b
--- /dev/null
+++ b/lib/easy/2367_number_of_arithmetic_triplets.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require 'set'
+
+# https://leetcode.com/problems/number-of-arithmetic-triplets/
+# @param {Integer[]} nums
+# @param {Integer} diff
+# @return {Integer}
+def arithmetic_triplets(nums, diff)
+  uniq = nums.to_set
+  nums.uniq.sum { |num| uniq.include?(num + diff) && uniq.include?(num + 2 * diff) ? 1 : 0 }
+end
diff --git a/test/easy/test_2367_number_of_arithmetic_triplets.rb b/test/easy/test_2367_number_of_arithmetic_triplets.rb
new file mode 100644
index 00000000..32e959c5
--- /dev/null
+++ b/test/easy/test_2367_number_of_arithmetic_triplets.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/2367_number_of_arithmetic_triplets'
+require 'minitest/autorun'
+
+class NumberOfArithmeticTripletsTest < ::Minitest::Test
+  def test_default
+    assert_equal(2, arithmetic_triplets([0, 1, 4, 6, 7, 10], 3))
+    assert_equal(2, arithmetic_triplets([4, 5, 6, 7, 8, 9], 2))
+  end
+end