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Folders and files

Name		Name	Last commit message	Last commit date
parent directory ..
102_binary_tree_level_order_traversal.cpp		102_binary_tree_level_order_traversal.cpp
103_binary_tree_zigzag_level_order_traversal.cpp		103_binary_tree_zigzag_level_order_traversal.cpp
11_container_with_most_water.cpp		11_container_with_most_water.cpp
127_word_ladder.cpp		127_word_ladder.cpp
12_integer_to_roman.cpp		12_integer_to_roman.cpp
133_clone_graph.cpp		133_clone_graph.cpp
138_copy_list_with_random_pointer.cpp		138_copy_list_with_random_pointer.cpp
139_word_break.cpp		139_word_break.cpp
151_reverse_words_in_a_string.cpp		151_reverse_words_in_a_string.cpp
153_find_minimum_in_rotated_sorted_array.cpp		153_find_minimum_in_rotated_sorted_array.cpp
15_3sum.cpp		15_3sum.cpp
173_binary_search_tree_iterator.cpp		173_binary_search_tree_iterator.cpp
17_letter_combinations_of_a_phone_number.cpp		17_letter_combinations_of_a_phone_number.cpp
192_word_frequency.sh		192_word_frequency.sh
19_remove_nth_node_from_end_of_list.cpp		19_remove_nth_node_from_end_of_list.cpp
200_number_of_islands.cpp		200_number_of_islands.cpp
215_kth_largest_element_in_an_array.cpp		215_kth_largest_element_in_an_array.cpp
227_basic_calculator_2.cpp		227_basic_calculator_2.cpp
22_generate_parentheses.cpp		22_generate_parentheses.cpp
236_lowest_common_ancestor_of_a_binary_tree.cpp		236_lowest_common_ancestor_of_a_binary_tree.cpp
238_product_of_array_except_self.cpp		238_product_of_array_except_self.cpp
253_meeting_rooms_2.cpp		253_meeting_rooms_2.cpp
29_divide_two_integers.cpp		29_divide_two_integers.cpp
2_add_two_numbers.cpp		2_add_two_numbers.cpp
300_longest_increasing_subsequence.cpp		300_longest_increasing_subsequence.cpp
31_next_permutation.cpp		31_next_permutation.cpp
322_coin_change.cpp		322_coin_change.cpp
33_search_in_rotated_sorted_array.cpp		33_search_in_rotated_sorted_array.cpp
341_flatten_nested_list_iterator.cpp		341_flatten_nested_list_iterator.cpp
347_top_k_frequent_elements.cpp		347_top_k_frequent_elements.cpp
36_valid_sudoku.cpp		36_valid_sudoku.cpp
380_insert_delete_get_random.cpp		380_insert_delete_get_random.cpp
3_longest_substring_without_repeating_characters.cpp		3_longest_substring_without_repeating_characters.cpp
46_permutations.cpp		46_permutations.cpp
48_rotate_image.cpp		48_rotate_image.cpp
49_group_anagrams.cpp		49_group_anagrams.cpp
50_pow_x_n.cpp		50_pow_x_n.cpp
535_encode_and_decode_tinyurl.cpp		535_encode_and_decode_tinyurl.cpp
54_spiral_matrix.cpp		54_spiral_matrix.cpp
560_subarray_sum_equals_k.cpp		560_subarray_sum_equals_k.cpp
56_merge_intervals.cpp		56_merge_intervals.cpp
5_longest_palindromic_substring.cpp		5_longest_palindromic_substring.cpp
681_next_closest_time.cpp		681_next_closest_time.cpp
695_max_area_of_island.cpp		695_max_area_of_island.cpp
722_remove_comments.cpp		722_remove_comments.cpp
79_word_search.cpp		79_word_search.cpp
8_string_to_integer_atoi.cpp		8_string_to_integer_atoi.cpp
91_decode_ways.cpp		91_decode_ways.cpp
92_reverse_linked_list_2.cpp		92_reverse_linked_list_2.cpp
94_binary_tree_inorder_traversal.cpp		94_binary_tree_inorder_traversal.cpp
98_validate_binary_search_tree.cpp		98_validate_binary_search_tree.cpp
README.md		README.md
View all files

README.md

medium level

Problem summary with the category tags.

Title	Tags
2. Add Two Numbers	linked list
3. Longest Substring Without Repeating Characters	hash map
11. Container With Most Water	greedy
5. Longest Palindromic Substring	dynamic programming
200. Number of Islands	dfs
56. Merge Intervals	sorting
15. 3Sum	hash map, sorting
138. Copy List with Random Pointer	hash map, linked list
8. String to Integer (atoi)	general
12. Integer to Roman	general
238. Product of Array Except Self	general
33. Search in Rotated Sorted Array	binary search
17. Letter Combinations of a Phone Number	dfs
31. Next Permutation	permutation
139. Word Break	trie, dynamic programming
681. Next Closest Time	dfs
192. Word Frequency	bash
49. Group Anagrams	hash table, sorting
347. Top K Frequent Elements	hash table, quick sort, priority queue
151. Reverse Words in a String	general
253. Meeting Rooms II	sorting, priority queue
695. Max Area of Island	dfs
54. Spiral Matrix	general
50. Pow(x, n)	recursive
19. Remove Nth Node From End of List	linked list
91. Decode Ways	dynamic programming
535. Encode and Decode TinyURL	hash table
29. Divide Two Integers	general
46. Permutations	dfs
22. Generate Parentheses	dfs
98. Validate Binary Search Tree	binary search tree
92. Reverse Linked List II	linked list
215. Kth Largest Element in an Array	quick sort
227. Basic Calculator II	stack
560. Subarray Sum Equals K	hash table
127. Word Ladder	bfs
103. Binary Tree Zigzag Level Order Traversal	bfs, stack
79. Word Search	dfs
300. Longest Increasing Subsequence	dynamic programming, binary search
94. Binary Tree Inorder Traversal	binary tree
102. Binary Tree Level Order Traversal	bfs, binary tree
236. Lowest Common Ancestor of a Binary Tree	binary tree
380. Insert Delete GetRandom O(1)	hash table
153. Find Minimum in Rotated Sorted Array	binary search
133. Clone Graph	dfs
341. Flatten Nested List Iterator	dfs
722. Remove Comments	string
36. Valid Sudoku	general
48. Rotate Image	general
173. Binary Search Tree Iterator	binary search tree, stack
322. Coin Change	dynamic programming