- valid_binary_tree.rb
- binary_tree.rb (needs to actually delete nodes)
- encode_url.rb
- traverse_spiral_matrix.rb
- rotate_array.rb
- palindrome_linked_list.rb
- min_change_sum.rb
- merge_sorted_arrays.rb
- longest_common_prefix.rb (break i what?)
- largest_internal_binary_search_tree.rb
- isomorphic_strings.rb
- graph_depth_first_search.rb
- graph_breadth_first_search.rb
- binary_search_tree_from_array.rb (look into this)
- balanced_binary_tree.rb
- maximum_subsequence.rb
- string_is_substring.rb
- reverse_characters_and_strings.rb (look into this)
- path_between_two_nodes.rb
- partition_linked_list.rb
- danny_search.rb
- add_revered_linked_list_digits.rb
- basic_string_compression.rb
- find_linked_list_cycle.rb (look into this)
- linked_list_palindrome.rb (look into this)
- make_change.rb