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10_regular_expression_matching.cpp
10_regular_expression_matching.cpp
 
 
124_binary_tree_maximum_path_sum.cpp
124_binary_tree_maximum_path_sum.cpp
 
 
128_longest_consecutive_sequence.cpp
128_longest_consecutive_sequence.cpp
 
 
140_word_break_2.cpp
140_word_break_2.cpp
 
 
146_lru_cache.cpp
146_lru_cache.cpp
 
 
149_max_points_on_a_line.cpp
149_max_points_on_a_line.cpp
 
 
224_basic_calculator.cpp
224_basic_calculator.cpp
 
 
239_sliding_window_maximum.cpp
239_sliding_window_maximum.cpp
 
 
23_merge_k_sorted_lists.cpp
23_merge_k_sorted_lists.cpp
 
 
25_reverse_nodes_in_k_group.cpp
25_reverse_nodes_in_k_group.cpp
 
 
269_alien_dictionary.cpp
269_alien_dictionary.cpp
 
 
273_integer_to_english_words.cpp
273_integer_to_english_words.cpp
 
 
295_find_median_from_data_stream.cpp
295_find_median_from_data_stream.cpp
 
 
297_serialize_and_deserialize_binary_tree.cpp
297_serialize_and_deserialize_binary_tree.cpp
 
 
301_remove_invalid_parentheses.cpp
301_remove_invalid_parentheses.cpp
 
 
32_longest_valid_parentheses.cpp
32_longest_valid_parentheses.cpp
 
 
336_palindrome_pairs.cpp
336_palindrome_pairs.cpp
 
 
403_frog_jump.cpp
403_frog_jump.cpp
 
 
41_first_missing_positive.cpp
41_first_missing_positive.cpp
 
 
42_trapping_rain_water.cpp
42_trapping_rain_water.cpp
 
 
45_jump_game_2.cpp
45_jump_game_2.cpp
 
 
4_median_of_two_sorted_arrays.cpp
4_median_of_two_sorted_arrays.cpp
 
 
642_design_search_autocomplete_system.cpp
642_design_search_autocomplete_system.cpp
 
 
65_valid_number.cpp
65_valid_number.cpp
 
 
72_edit_distance.cpp
72_edit_distance.cpp
 
 
76_minimum_window_substring.cpp
76_minimum_window_substring.cpp
 
 
README.md
README.md
 
 

README.md

hard level

Problem summary with the category tags.

Title Tags
4. Median of Two Sorted Arrays binary search
146. LRU Cache linked list, hash table
23. Merge k Sorted Lists linked list, priority queue
273. Integer to English Words general
42. Trapping Rain Water general
10. Regular Expression Matching dynamic programming
41. First Missing Positive hash table, general
76. Minimum Window Substring hash table, greedy
149. Max Points on a Line geography, hash table
297. Serialize and Deserialize Binary Tree binary tree
65. Valid Number general
25. Reverse Nodes in k-Group linked list
32. Longest Valid Parentheses dynamic programming
224. Basic Calculator stack
124. Binary Tree Maximum Path Sum binary tree, dynamic programming
301. Remove Invalid Parentheses dfs
72. Edit Distance dynamic programming
128. Longest Consecutive Sequence disjoint set
269. Alien Dictionary toplogical sort
403. Frog Jump dynammic programming
336. Palindrome Pairs trie, hash table
140. Word Break II trie, dynamic programming
45. Jump Game II dynamic programming
295. Find Median from Data Stream priority queue
642. Design Search Autocomplete System trie
239. Sliding Window Maximum deque