2025-01-30 v. 8.3.5: added "1171. Remove Zero Sum Consecutive Nodes from Linked List"

Author: fartem

README.md

@@ -666,6 +666,7 @@ Profile on LeetCode: [fartem](https://leetcode.com/fartem/).
 | 1111. Maximum Nesting Depth of Two Valid Parentheses Strings     | [Link](https://leetcode.com/problems/maximum-nesting-depth-of-two-valid-parentheses-strings/)      | [Link](./lib/medium/1111_maximum_nesting_depth_of_two_valid_parentheses_strings.rb)     | [Link](./test/medium/test_1111_maximum_nesting_depth_of_two_valid_parentheses_strings.rb)     |
 | 1123. Lowest Common Ancestor of Deepest Leaves                   | [Link](https://leetcode.com/problems/lowest-common-ancestor-of-deepest-leaves/)                    | [Link](./lib/medium/1123_lowest_common_ancestor_of_deepest_leaves.rb)                   | [Link](./test/medium/test_1123_lowest_common_ancestor_of_deepest_leaves.rb)                   |
 | 1161. Maximum Level Sum of a Binary Tree                         | [Link](https://leetcode.com/problems/maximum-level-sum-of-a-binary-tree/)                          | [Link](./lib/medium/1161_maximum_level_sum_of_a_binary_tree.rb)                         | [Link](./test/medium/test_1161_maximum_level_sum_of_a_binary_tree.rb)                         |
+| 1171. Remove Zero Sum Consecutive Nodes from Linked List         | [Link](https://leetcode.com/problems/remove-zero-sum-consecutive-nodes-from-linked-list/)          | [Link](./lib/medium/1171_remove_zero_sum_consecutive_nodes_from_linked_list.rb)         | [Link](./test/medium/test_1171_remove_zero_sum_consecutive_nodes_from_linked_list.rb)         |
 | 1209. Remove All Adjacent Duplicates in String II                | [Link](https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string-ii/)                 | [Link](./lib/medium/1209_remove_all_adjacent_duplicates_in_string_ii.rb)                | [Link](./test/medium/test_1209_remove_all_adjacent_duplicates_in_string_ii.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)                 |

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 = '8.3.4'
+  s.version = '8.3.5'
   s.license = 'MIT'
   s.files = ::Dir['lib/**/*.rb'] + %w[README.md]
   s.executable = 'leetcode-ruby'

lib/medium/1171_remove_zero_sum_consecutive_nodes_from_linked_list.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require_relative '../common/linked_list'
+
+# https://leetcode.com/problems/remove-zero-sum-consecutive-nodes-from-linked-list/
+# @param {ListNode} head
+# @return {ListNode}
+def remove_zero_sum_sublists(head)
+  return unless head
+
+  dummy = ::ListNode.new(0)
+  dummy.next = head
+  prefix_sum = 0
+  prefix_sums = {}
+  current = dummy
+
+  while current
+    prefix_sum += current.val
+
+    if prefix_sums[prefix_sum]
+      prev = prefix_sums[prefix_sum]
+      temp_sum = prefix_sum
+      temp = prev.next
+
+      while temp != current
+        temp_sum += temp.val
+        prefix_sums.delete(temp_sum)
+        temp = temp.next
+      end
+
+      prev.next = current.next
+    else
+      prefix_sums[prefix_sum] = current
+    end
+
+    current = current.next
+  end
+
+  dummy.next
+end

test/medium/test_1171_remove_zero_sum_consecutive_nodes_from_linked_list.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require_relative '../test_helper'
+require_relative '../../lib/common/linked_list'
+require_relative '../../lib/medium/1171_remove_zero_sum_consecutive_nodes_from_linked_list'
+require 'minitest/autorun'
+
+class RemoveZeroSumConsecutiveNodesFromLinkedListTest < ::Minitest::Test
+  def test_default_one
+    assert(
+      ::ListNode.are_equals(
+        ::ListNode.from_array(
+          [3, 1]
+        ),
+        remove_zero_sum_sublists(
+          ::ListNode.from_array(
+            [1, 2, -3, 3, 1]
+          )
+        )
+      )
+    )
+  end
+
+  def test_default_two
+    assert(
+      ::ListNode.are_equals(
+        ::ListNode.from_array(
+          [1, 2, 4]
+        ),
+        remove_zero_sum_sublists(
+          ::ListNode.from_array(
+            [1, 2, 3, -3, 4]
+          )
+        )
+      )
+    )
+  end
+
+  def test_default_three
+    assert(
+      ::ListNode.are_equals(
+        ::ListNode.from_array(
+          [1]
+        ),
+        remove_zero_sum_sublists(
+          ::ListNode.from_array(
+            [1, 2, 3, -3, -2]
+          )
+        )
+      )
+    )
+  end
+end