├── .gitignore ├── README.md ├── pom.xml └── src └── main └── java ├── Array ├── no11_container_with_most_water.java ├── no136_single_number.java ├── no1391_check_if_there_is_a_valid_path_in_a_grid.java ├── no14_longest_common_prefix.java ├── no152_maximum_product_subarray.java ├── no153_find_minimum_in_rotated_sorted_array.java ├── no154_find_minimum_in_rotated_sorted_array_ii.java ├── no15_3sum.java ├── no167_two_sum_ii_input_array_is_sorted.java ├── no16_3sum_closest.java ├── no189_rotate_array.java ├── no18_4sum.java ├── no1_two_sum.java ├── no209_minimum_size_subarray_sum.java ├── no215_kth_largest_element_in_an_array.java ├── no228_summary_ranges.java ├── no238_product_of_array_except_self.java ├── no239_sliding_window_maximum.java ├── no240_search_a_2d_matrix_ii.java ├── no26_remove_duplicates_from_sorted_array.java ├── no274_h_index.java ├── no27_remove_element.java ├── no283_move_zeroes.java ├── no287_find_the_duplicate_number.java ├── no295_find_median_from_data_stream.java ├── no30_substring_with_concatenation_of_all_words.java ├── no31_next_permutation.java ├── no33_search_in_rotated_sorted_array.java ├── no347_topk_frequent_elements.java ├── no34_find_first_and_last_position_of_element_in_sorted_array.java ├── no35_search_insert_position.java ├── no36_valid_sudoku.java ├── no39_combination_sum.java ├── no40_combination_sum_ii.java ├── no414_third_maximum_number.java ├── no41_first_missing_positive.java ├── no442_find_all_duplicates_in_an_array.java ├── no448_find_all_numbers_disappeared_in_an_array.java ├── no453_minimum_moves_to_equal_array_elements.java ├── no46_permutations.java ├── no47_permutations_ii.java ├── no485_max_consecutive_ones.java ├── no48_rotate_image.java ├── no495_teemo_attacking.java ├── no49_group_anagrams.java ├── no4_median_of_two_sorted_arrays.java ├── no53_maximum_subarray.java ├── no54_spiral_matrix.java ├── no55_jump_game.java ├── no56_merge_intervals.java ├── no57_insert_interval.java ├── no628_maximum_product_of_three_numbers.java ├── no645_set_mismatch.java ├── no64_minimum_path_sum.java ├── no665_non_decreasing_array.java ├── no66_plus_one.java ├── no697_degree_of_an_array.java ├── no704_binary_search.java ├── no75_sort_colors.java ├── no78_subsets.java ├── no80_remove_duplicates_from_sorted_array_ii.java ├── no81_search_in_rotated_sorted_array_ii.java ├── no88_merge_sorted_array.java └── no90_subsets_ii.java ├── BackTracking ├── no406_queue_reconstruction_by_height.java ├── no46_permutations.java ├── no47_permutations_ii.java └── no494_target_sum.java ├── BinarySearch ├── no4_median_of_two_sorted_arrays.java ├── no704_binary_search.java └── readme.md ├── Bits ├── no191_number_of_1_bits.java ├── no338_counting_bits.java └── no461_hamming_distance.java ├── DFS_BFS ├── no130_surrounded_regions.java ├── no138_copy_list_with_random_pointer.java ├── no200_number_of_islands.java ├── no207_course_schedule.java ├── no211_design_add_and_search_words_data_structure.java ├── no279_perfect_squares.java ├── no322_coin_change.java ├── no329_longest_increasing_path_in_a_matrix.java ├── no332_reconstruct_itinerary.java ├── no343_integer_break.java ├── no365_water_and_jug_problem.java ├── no385_mini_parser.java ├── no386_exicographical_numbers.java ├── no388_longest_absolute_file_path.java ├── no399_evaluate_division.java ├── no543_diameter_of_binary_tree.java ├── no784_letter_case_permutation.java ├── no78_subsets.java └── no79_word_search.java ├── DP ├── README ├── no1014_best_sightseeing_pair.java ├── no1049_last_stone_weight_ii.java ├── no1137_n_th_tribonacci_number.java ├── no120_triangle.java ├── no121_best_time_to_buy_and_sell_stock.java ├── no122_best_time_to_buy_and_sell_stock_ii.java ├── no139_word_break.java ├── no1567_maximum_length_of_subarray_with_positive_product.java ├── no198_house_robber.java ├── no213_house_robber_ii.java ├── no221_maximal_square.java ├── no264_ugly_number_ii.java ├── no279_perfect_squares.java ├── no300_longest_increasing_subsequence.java ├── no309_best_time_to_buy_and_sell_stock_with_cooldown.java ├── no322_coin_change.java ├── no337_house_robber_iii.java ├── no413_arithmetic_slices.java ├── no416_partition_equal_subset_sum.java ├── no42_trapping_rain_water.java ├── no45_jump_game_ii.java ├── no474_ones_and_zeroes.java ├── no494_target_sum.java ├── no509_fibonacci_number.java ├── no55_jump_game.java ├── no5_longest_palindromic_substring.java ├── no639_decode_ways_ii.java ├── no63_unique_paths_ii.java ├── no647_palindromic_substrings.java ├── no64_minimum_path_sum.java ├── no650_2_keys_keyboard.java ├── no70_climbing_stairs.java ├── no714_best_time_to_buy_and_sell_stock_with_transaction_fee.java ├── no740_delete_and_earn.java ├── no746_min_cost_climbing_stairs.java ├── no918_maximum_sum_circular_subarray.java ├── no91_decode_ways.java ├── no931_minimum_falling_path_sum.java └── no983_minimum_cost_for_tickets.java ├── Greedy ├── no1005_maximize_sum_of_array_after_k_negations.java ├── no134_gas_station.java ├── no179_largest_number.java ├── no316_remove_duplicate_letters.java ├── no376_wiggle_subsequence.java ├── no392_is_subsequence.java ├── no409_longest_palindrome.java ├── no435_non_overlapping_intervals.java ├── no452_minimum_number_of_arrows_to_burst_balloons.java ├── no455_assign_cookies.java ├── no605_can_place_flowers.java ├── no738_monotone_increasing_digits.java └── no860_lemonade_change.java ├── List ├── no141_linked_list_cycle.java ├── no142_linked_list_cycle_ii.java ├── no148_sort_list.java ├── no160_intersection_of_two_linked_lists.java ├── no19_remove_nth_node_from_end_of_list.java ├── no206_reverse_linked_list.java ├── no21_merge_two_sorted_lists.java ├── no22_generate_parentheses.java ├── no234_palindrome_linked_list.java ├── no23_merge_k_sorted_lists.java ├── no24_swap_nodes_in_pairs.java ├── no25_reverse_nodes_in_k_group.java ├── no2_add_two_numbers.java ├── no51_n_queens.java ├── no83_remove_duplicates_from_sorted_list.java └── no92_reverse_linked_list_ii.java ├── Other ├── no146_lru_cache.java ├── no263_ugly_number.java ├── no29_divide_two_integers.java ├── no38_count_and_say.java ├── no438_find_all_anagrams_in_a_string.java ├── no50_powx_n.java ├── no52_n_queens_ii.java ├── no581_shortest_unsorted_continuous_subarray.java ├── no69_sqrtx.java ├── no70_climbing_stairs.java ├── no7_reverse_integer.java ├── no9_palindrome_number.java ├── offer29_spiralOrder.java └── unique_paths.java ├── Prefix └── no560_subarray_sum_equals_k.java ├── Recursion ├── no104_maximum_depth_of_binary_tree.java └── no233_number_of_digit_one.java ├── Stack_Queue ├── no155_min_stack.java ├── no394_decode_string.java ├── no621_task_scheduler.java ├── no739_daily_temperatures.java └── no946_validateStackSequences.java ├── String ├── StringTest.java ├── no10_regular_expression_matching.java ├── no125_valid_palindrome.java ├── no12_integer_to_roman.java ├── no13_roman_to_integer.java ├── no17_letter_combinations_of_a_phone_number.java ├── no20_valid_parentheses.java ├── no28_implement_strstr.java ├── no32_longest_valid_parentheses.java ├── no3_longest_substring_without_repeating_characters.java ├── no43_multiply_strings.java ├── no58_length_of_last_word.java ├── no5_longest_palindromic_substring.java ├── no67_add_binary.java ├── no6_zigzag_conversion.java ├── no72_edit_distance.java ├── no76_minimum_window_substring.java └── no8_string_to_integer_atoi.java ├── Topological_Sort ├── no207_course_schedule.java ├── no210_course_schedule_ii.java └── no310_minimum_height_trees.java ├── Tree ├── no100_same_tree.java ├── no101_symmetric_tree.java ├── no1028_recover_a_tree_from_preorder_traversal.java ├── no102_binary_tree_level_order_traversal.java ├── no103_binary_tree_zigzag_level_order_traversal.java ├── no104_maximum_depth_of_binary_tree.java ├── no105_construct_binary_tree_from_preorder_and_inorder_traversal.java ├── no106_construct_binary_tree_from_inorder_and_postorder_traversal.java ├── no107_binary_tree_level_order_traversal_ii.java ├── no108_convert_sorted_array_to_binary_search_tree.java ├── no109_convert_sorted_list_to_binary_search_tree.java ├── no110_isBalanced.java ├── no111_minimum_depth_of_binary_tree.java ├── no112_path_sum.java ├── no113_path_sum_ii.java ├── no114_flatten_binary_tree_to_linked_list.java ├── no116_populating_next_right_pointers_in_each_node.java ├── no117_populating_next_right_pointers_in_each_node_ii.java ├── no124_binary_tree_maximum_path_sum.java ├── no129_sum_root_to_leaf_numbers.java ├── no133_clone_graph.java ├── no1367_linked_list_in_binary_tree.java ├── no144_binary_tree_preorder_traversal.java ├── no145_binary_tree_postorder_traversal.java ├── no156_binary_tree_upside_down.java ├── no173_binary_search_tree_iterator.java ├── no199_binary_tree_right_side_view.java ├── no1_binode_lcci.java ├── no222_count_complete_tree_nodes.java ├── no226_invert_binary_tree.java ├── no230_kth_smallest_element_in_a_bst.java ├── no235_lowest_common_ancestor_of_a_binary_search_tree.java ├── no236_lowest_common_ancestor_of_a_binary_tree.java ├── no257_binary_tree_paths.java ├── no297_serialize_and_deserialize_binary_tree.java ├── no331_verify_preorder_serialization_of_a_binary_tree.java ├── no341_flatten_nested_list_iterator.java ├── no404_sum_of_left_leaves.java ├── no437_path_sum_iii.java ├── no538_convert_bst_to_greater_tree.java ├── no617_merge_two_binary_trees.java ├── no94_binary_tree_inorder_traversal.java ├── no95_unique_binary_search_trees_ii.java ├── no96_unique_binary_search_trees.java ├── no98_validate_binary_search_tree.java └── no99_recover_binary_search_tree.java ├── Trie ├── no139_word_break.java └── no208_implement_trie_prefix_tree.java ├── Union_find └── no128_longest_consecutive_sequence.java ├── WeeklyContest ├── no5194_minimum_moves_to_reach_target_score.java ├── no5892_solving_questions_with_brainpower.java ├── no5963_a_number_after_a_double_reversal.java ├── no5964_execution_of_all_suffix_instructions_staying_in_a_grid.java ├── no5965_intervals_between_identical_elements.java ├── no5967_check_if_all_as_appears_before_all_bs.java ├── no5968_number_of_laser_beams_in_a_bank.java ├── no5969_destroying_asteroids.java ├── no5970_maximum_employees_to_be_invited_to_a_meeting.java └── no5980_divide_a_string_into_groups_of_size_k.java ├── common ├── ListNode.java ├── NestedInteger.java ├── Node.java ├── TreeNode.java ├── TrieNode.java ├── graph │ └── Node.java └── multi │ └── Node.java ├── concurrent ├── CompletionServiceTest.java └── ReentrantLockForIncrease.java ├── lcci ├── check_permutation_lcci.java ├── contiguous_sequence_lcci.java ├── draw_line_lcci.java ├── eight_queens_lcci.java ├── ero_matrix_lcci.java ├── find_longest_subarray_lcci.java ├── find_majority_element_lcci.java ├── hanota_lcci.java ├── langtons_ant_lcci.java ├── living_people_lcci.java ├── magic_index_lcci.java ├── master_mind_lcci.java ├── missing_number_lcci.java ├── missing_two_lcci.java ├── pairs_with_sum_lcci.java ├── pattern_matching_lcci.java ├── power_set_lcci.java ├── rotate_matrix_lcci.java ├── s_unique_lcci.java ├── search_rotate_array_lcci.java ├── smallest_difference_lcci.java ├── sorted_merge_lcci.java ├── sub_sort_lcci.java ├── sum_swap_lcci.java ├── t9_lcci.java ├── tic_tac_toe_lcci.java ├── volume_of_histogram_lcci.java └── word_transformer_lcci.java └── lcof_offer ├── offer10_fib.java ├── offer10_numWays.java ├── offer11_minArray.java ├── offer12_exist.java ├── offer13_movingCount.java ├── offer14_cuttingRope.java ├── offer14_cuttingRope_II.java ├── offer15_hammingWeight.java ├── offer16_myPow.java ├── offer17_printNumbers.java ├── offer18_deleteNode.java ├── offer19_isMatch.java ├── offer20_isNumber.java ├── offer21_exchange.java ├── offer22_getKthFromEnd.java ├── offer24_reverseList.java ├── offer25_mergeTwoLists.java ├── offer26_isSubStructure.java ├── offer26_shu_de_zi_jie_gou_lcof.java ├── offer27_mirrorTree.java ├── offer28_isSymmetric.java ├── offer30_MinStack.java ├── offer31_validateStackSequences.java ├── offer32_levelOrder.java ├── offer32_levelOrder_II.java ├── offer32_levelOrder_III.java ├── offer33_verifyPostorder.java ├── offer34_pathSum.java ├── offer35_copyRandomList.java ├── offer36_treeToDoublyList.java ├── offer37_serialize_and_deserialize_binary_tree.java ├── offer38_permutation.java ├── offer39_majorityElement.java ├── offer3_findRepeatNumber.java ├── offer40_getLeastNumbers.java ├── offer41_MedianFinder.java ├── offer42_maxSubArray.java ├── offer43_countDigitOne.java ├── offer45_minNumber.java ├── offer4_findNumberIn2DArray.java ├── offer50_firstUniqChar.java ├── offer54_kthLargest.java ├── offer55_isBalanced.java ├── offer55_maxDepth.java ├── offer57_findContinuousSequence.java ├── offer5_replaceSpace.java ├── offer68_lowestCommonAncestor.java ├── offer68_lowestCommonAncestor_II.java ├── offer6_reversePrint.java ├── offer7_buildTree.java └── offer9_2stackimpl_queue.java 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