Merge pull request #608 from fartem/2319_Check_if_Matrix_Is_X-Matrix

2024-04-22 v. 5.5.1: added "2319. Check if Matrix Is X-Matrix"

Author: fartem

README.md

@@ -411,3 +411,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 2303. Calculate Amount Paid in Taxes                               | [Link](https://leetcode.com/problems/calculate-amount-paid-in-taxes/)                               | [Link](./lib/easy/2303_calculate_amount_paid_in_taxes.rb)                               |
 | 2309. Greatest English Letter in Upper and Lower Case              | [Link](https://leetcode.com/problems/greatest-english-letter-in-upper-and-lower-case/)              | [Link](./lib/easy/2309_greatest_english_letter_in_upper_and_lower_case.rb)              |
 | 2315. Count Asterisks                                              | [Link](https://leetcode.com/problems/count-asterisks/)                                              | [Link](./lib/easy/2315_count_asterisks.rb)                                              |
+| 2319. Check if Matrix Is X-Matrix                                  | [Link](https://leetcode.com/problems/check-if-matrix-is-x-matrix/)                                  | [Link](./lib/easy/2319_check_if_matrix_is_x_matrix.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 = '5.5.0'
+  s.version = '5.5.1'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[bin/leetcode-ruby README.md LICENSE]
   s.executable = 'leetcode-ruby'

lib/easy/2319_check_if_matrix_is_x_matrix.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/check-if-matrix-is-x-matrix/
+# @param {Integer[][]} grid
+# @return {Boolean}
+def check_x_matrix(grid)
+  n = grid.length
+  (0...n).each do |i|
+    return false if grid[i][i].zero? || grid[i][n - i - 1].zero?
+  end
+
+  (0...n).each do |i|
+    (0...n).each do |j|
+      next unless i != j && j != n - i - 1
+
+      return false if grid[i][j].positive?
+    end
+  end
+
+  true
+end

test/easy/test_2319_check_if_matrix_is_x_matrix.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/easy/2319_check_if_matrix_is_x_matrix'
+require 'minitest/autorun'
+
+class CheckIfMatrixIsXMatrixTest < ::Minitest::Test
+  def test_default
+    assert(check_x_matrix([[2, 0, 0, 1], [0, 3, 1, 0], [0, 5, 2, 0], [4, 0, 0, 2]]))
+    assert(!check_x_matrix([[5, 7, 0], [0, 3, 1], [0, 5, 0]]))
+  end
+end