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2025-02-14 v. 8.5.7: added "1395. Count Number of Teams" #946

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Feb 14, 2025
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1 change: 1 addition & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -689,6 +689,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
| 1381. Design a Stack With Increment Operation | [Link](https://leetcode.com/problems/design-a-stack-with-increment-operation/) | [Link](./lib/medium/1381_design_a_stack_with_increment_operation.rb) | [Link](./test/medium/test_1381_design_a_stack_with_increment_operation.rb) |
| 1382. Balance a Binary Search Tree | [Link](https://leetcode.com/problems/balance-a-binary-search-tree/) | [Link](./lib/medium/1382_balance_a_binary_search_tree.rb) | [Link](./test/medium/test_1382_balance_a_binary_search_tree.rb) |
| 1387. Sort Integers by The Power Value | [Link](https://leetcode.com/problems/sort-integers-by-the-power-value/) | [Link](./lib/medium/1387_sort_integers_by_the_power_value.rb) | [Link](./test/medium/test_1387_sort_integers_by_the_power_value.rb) |
| 1395. Count Number of Teams | [Link](https://leetcode.com/problems/count-number-of-teams/) | [Link](./lib/medium/1395_count_number_of_teams.rb) | [Link](./test/medium/test_1395_count_number_of_teams.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) |
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2 changes: 1 addition & 1 deletion leetcode-ruby.gemspec
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@ require 'English'
::Gem::Specification.new do |s|
s.required_ruby_version = '>= 3.0'
s.name = 'leetcode-ruby'
s.version = '8.5.6'
s.version = '8.5.7'
s.license = 'MIT'
s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
s.executable = 'leetcode-ruby'
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31 changes: 31 additions & 0 deletions lib/medium/1395_count_number_of_teams.rb
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@@ -0,0 +1,31 @@
# frozen_string_literal: true

# https://leetcode.com/problems/count-number-of-teams/
# @param {Integer[]} rating
# @return {Integer}
def num_teams(rating)
size = rating.size
up = ::Array.new(size, 0)
down = ::Array.new(size, 0)
result = 0

(0...size).each do |i|
i.downto(0) do |j|
if rating[i] > rating[j]
up[i] += 1
result += up[j]
end
end
end

(0...size).each do |i|
i.downto(0) do |j|
if rating[i] < rating[j]
down[i] += 1
result += down[j]
end
end
end

result
end
13 changes: 13 additions & 0 deletions test/medium/test_1395_count_number_of_teams.rb
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
# frozen_string_literal: true

require_relative '../test_helper'
require_relative '../../lib/medium/1395_count_number_of_teams'
require 'minitest/autorun'

class CountNumberOfTeamsTest < ::Minitest::Test
def test_default_one = assert_equal(3, num_teams([2, 5, 3, 4, 1]))

def test_default_two = assert_equal(0, num_teams([2, 1, 3]))

def test_default_three = assert_equal(4, num_teams([1, 2, 3, 4]))
end