Merge pull request #774 from fartem/435_Non-overlapping_Intervals

2024-11-15 v. 7.0.4: added "435. Non-overlapping Intervals"

Author: fartem

README.md

@@ -569,3 +569,4 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 417. Pacific Atlantic Water Flow                                | [Link](https://leetcode.com/problems/pacific-atlantic-water-flow/)                                | [Link](./lib/medium/417_pacific_atlantic_water_flow.rb)                                | [Link](./test/medium/test_417_pacific_atlantic_water_flow.rb)                                |
 | 424. Longest Repeating Character Replacement                    | [Link](https://leetcode.com/problems/longest-repeating-character-replacement/)                    | [Link](./lib/medium/424_longest_repeating_character_replacement.rb)                    | [Link](./test/medium/test_424_longest_repeating_character_replacement.rb)                    |
 | 429. N-ary Tree Level Order Traversal                           | [Link](https://leetcode.com/problems/n-ary-tree-level-order-traversal/)                           | [Link](./lib/medium/429_n_ary_tree_level_order_traversal.rb)                           | [Link](./test/medium/test_429_n_ary_tree_level_order_traversal.rb)                           |
+| 435. Non-overlapping Intervals                                  | [Link](https://leetcode.com/problems/non-overlapping-intervals/)                                  | [Link](./lib/medium/435_non_overlapping_intervals.rb)                                  | [Link](./test/medium/test_435_non_overlapping_intervals.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 = '7.0.3'
+  s.version = '7.0.4'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/435_non_overlapping_intervals.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# https://leetcode.com/problems/non-overlapping-intervals/
+# @param {Integer[][]} intervals
+# @return {Integer}
+def erase_overlap_intervals(intervals)
+  intervals.sort_by!(&:first)
+  max = intervals.first.last
+  result = 0
+  intervals.each do |inter|
+    if inter.first < max
+      result += 1
+      max = [max, inter.last].min
+    else
+      max = inter.last
+    end
+  end
+
+  result - 1
+end

test/medium/test_435_non_overlapping_intervals.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/medium/435_non_overlapping_intervals'
+require 'minitest/autorun'
+
+class NonOverlappingIntervalsTest < ::Minitest::Test
+  def test_default_one
+    assert_equal(
+      1,
+      erase_overlap_intervals(
+        [
+          [1, 2],
+          [2, 3],
+          [3, 4],
+          [1, 3]
+        ]
+      )
+    )
+  end
+
+  def test_default_two
+    assert_equal(
+      2,
+      erase_overlap_intervals(
+        [
+          [1, 2],
+          [1, 2],
+          [1, 2]
+        ]
+      )
+    )
+  end
+
+  def test_default_three
+    assert_equal(
+      0,
+      erase_overlap_intervals(
+        [
+          [1, 2],
+          [2, 3]
+        ]
+      )
+    )
+  end
+end