前言

十月份共有60道题目，全部属于 Easy 难度的，所以公众号中分享出来的并不多，只是挑了一些感觉还可以的才分享了出来，这60道题目我按照不同类别进行了分类整理，所有源码以及对应的解题思路均匀开源到 GitHub，公众号内回复“LeetCode”获取，具体题目如下。

题目分类

数组

• 0001_two_sum
• 0026_remove_duplicates_from_sorted_array
• 0027_remove_element
• 0035_search_insert_position
• 0045_jump_game_II
• 0053_maximum_subarray
• 0055_jump_game
• 0066_plus_one
• 0088_merge_sorted_array
• 0106_binary_tree_postorder_traversal
• 0118_pascals_triangle
• 0119_pascals_triangle_ii
• 0121_best_time_to_buy_and_sell_stock
• 0122_best_time_to_buy_and_sell_stock_ii
• 0167_two_sum_ii
• 0169_majority_element
• 0189_rotate_array
• 0217_contains_duplicate
• 0219_contains_duplicate_ii

宽度优先搜索

• 0101_symmetric_tree
• 0107_binary_tree_level_order_traversal_ii
• 0111_minimum_depth_of_binary_tree

位运算

• 0136_single_number
• 0169_majority_element
• 0190_reverse_bits
• 0191_number_of_1_bits
• 0231_power_of_two

二分查找

• 0035_search_insert_position
• 0069_sqrtx
• 0167_two_sum_ii
• 0222_count_complete_tree_nodes
• 0300_longest_increasing_subsequence

分治法

• 0053_maximum_subarray
• 0169_majority_element

设计

• 0155_min_stack
• 0225_implement_stack_using_queues
• 0232_implement_queue_using_stacks

深度优先搜索

• 0100_same_tree
• 0101_symmetric_tree
• 0104_maximum_depth_of_binary_tree
• 0106_binary_tree_postorder_traversal
• 0108_convert_sorted_array_to_binary_search_tree
• 0110_balanced_binary_tree
• 0111_minimum_depth_of_binary_tree
• 0112_path_sum

动态规划

• 0053_maximum_subarray
• 0070_climbing_stairs
• 0121_best_time_to_buy_and_sell_stock
• 0198_house_robber
• 0300_longest_increasing_subsequence

贪心法

• 0045_jump_game_II
• 0055_jump_game
• 0122_best_time_to_buy_and_sell_stock_ii

哈希表

• 0001_two_sum
• 0136_single_number
• 0149_max_points_on_a_line
• 0202_happy_numbers
• 0204_count_primes
• 0205_isomorphic_strings
• 0217_contains_duplicate
• 0219_contains_duplicate_ii

链表

• 0021_merge_two_sorted_lists
• 0083_remove_duplicates_from_sorted_list
• 0141_linked_list_cycle
• 0147_insertion_sort_list
• 0160_intersection_of_two_linked_lists
• 0203_remove_linked_list_elements
• 0206_reverse_linked_list
• 0234_palindrome_linked_list
• 0237_delete_node_in_a_linked_list

数学

• 0007_reverse_integer
• 0009_palindrome_number
• 0013_roman_to_integer
• 0067_add_binary
• 0069_sqrtx
• 0149_max_points_on_a_line
• 0168_excel_sheet_column_title
• 0172_factorial_trailling_zeros
• 0202_happy_numbers
• 0204_count_primes
• 0231_power_of_two

栈

• 0020_valid_parentheses
• 0144_binary_tree_preorder_traversal
• 0150_evaluate_reverse_polish_notation
• 0155_min_stack
• 0225_implement_stack_using_queues
• 0232_implement_queue_using_stacks

字符串

• 0013_roman_to_integer
• 0014_longest_common_prefix
• 0020_valid_parentheses
• 0028_implement_strstr
• 0038_count_and_say
• 0058_length_of_last_word
• 0067_add_binary
• 0125_valid_palindrome

双指针

• 0026_remove_duplicates_from_sorted_array
• 0027_remove_element
• 0028_implement_strstr
• 0088_merge_sorted_array
• 0125_valid_palindrome
• 0141_linked_list_cycle
• 0167_two_sum_ii
• 0234_palindrome_linked_list

树

• 0100_same_tree
• 0101_symmetric_tree
• 0104_maximum_depth_of_binary_tree
• 0106_binary_tree_postorder_traversal
• 0107_binary_tree_level_order_traversal_ii
• 0108_convert_sorted_array_to_binary_search_tree
• 0110_balanced_binary_tree
• 0111_minimum_depth_of_binary_tree
• 0112_path_sum
• 0144_binary_tree_preorder_traversal
• 0222_count_complete_tree_nodes
• 0226_invert_binary_tree
• 0235_lowest_common_ancestor_of_a_binary_search_tree
• 0617_merge_two_binary_trees