題庫

共 173 道題目含解題說明

#	題目	難度	Rating	Topics
4	Median of Two Sorted Arrays	Hard	2028	arraybinary-searchdivide-and-conquer
10	Regular Expression Matching	Hard	2025	stringdynamic-programmingrecursion
23	Merge K Sorted Lists	Hard	1893	linked-listdivide-and-conquerheap-priority-queue+1
25	Reverse Nodes in k-Group	Hard	2011	linked-listrecursion
30	Substring with Concatenation of All Words	Hard	2039	hash-tablestringsliding-window
32	Longest Valid Parentheses	Hard	2118	stringdynamic-programmingstack
37	Sudoku Solver	Hard	2313	arrayhash-tablebacktracking+1
41	First Missing Positive	Hard	1944	arrayhash-table
42	Trapping Rain Water	Hard	2062	arraytwo-pointersdynamic-programming+2
44	Wildcard Matching	Hard	2100	stringdynamic-programminggreedy+1
51	N-Queens	Hard	1797	arraybacktracking
52	N-Queens II	Hard	1843	backtracking
60	Permutation Sequence	Hard	1953	mathrecursion
65	Valid Number	Hard	1892	string
68	Text Justification	Hard	1657	arraystringsimulation
76	Minimum Window Substring	Hard	1890	hash-tablestringsliding-window
84	Largest Rectangle in Histogram	Hard	1949	arraystackmonotonic-stack
85	Maximal Rectangle	Hard	2188	arraydynamic-programmingstack+2
87	Scramble String	Hard	2264	stringdynamic-programming
115	Distinct Subsequences	Hard	1849	stringdynamic-programming
123	Best Time to Buy and Sell Stock III	Hard	1977	arraydynamic-programming
124	Binary Tree Maximum Path Sum	Hard	1807	dynamic-programmingtreedepth-first-search+1
127	Word Ladder	Hard	2061	hash-tablestringbreadth-first-search
135	Candy	Hard	1750	arraygreedy
140	Word Break II	Hard	2081	hash-tablestringdynamic-programming+3
149	Max Points on a Line	Hard	1978	arrayhash-tablemath+1
188	Best Time to Buy and Sell Stock IV	Hard	2037	arraydynamic-programming
212	Word Search II	Hard	1976	arraystringbacktracking+2
218	The Skyline Problem	Hard	2452	arraydivide-and-conquerbinary-search+5
224	Basic Calculator	Hard	2010	mathstringstack+1
239	Sliding Window Maximum	Hard	1860	arrayqueuesliding-window+2
269	Alien Dictionary	Hard	1930	arraystringdepth-first-search+3
295	Find Median from Data Stream	Hard	1973	two-pointersdesignsorting+2
297	Serialize and Deserialize Binary Tree	Hard	1884	stringtreedepth-first-search+3
305	Number of Islands II	Hard	1885	arrayhash-tableunion-find+1
312	Burst Balloons	Hard	2056	arraydynamic-programming
315	Count of Smaller Numbers After Self	Hard	2215	arraybinary-searchdivide-and-conquer+4
327	Count of Range Sum	Hard	—	arraybinary-searchdivide-and-conquer+4
329	Longest Increasing Path in a Matrix	Hard	1965	arraydynamic-programmingdepth-first-search+5
330	Patching Array	Hard	2073	arraygreedy
332	Reconstruct Itinerary	Hard	1858	depth-first-searchgrapheulerian-circuit
336	Palindrome Pairs	Hard	2311	arrayhash-tablestring+1
352	Data Stream as Disjoint Intervals	Hard	1700	binary-searchdesignordered-set
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	—	arrayhash-tablemath+2
407	Trapping Rain Water II	Hard	2200	arraybreadth-first-searchheap-priority-queue+1
410	Split Array Largest Sum	Hard	1856	arraybinary-searchdynamic-programming+2
440	K-th Smallest in Lexicographic Order	Hard	1982	trie
460	LFU Cache	Hard	—	hash-tablelinked-listdesign+1
472	Concatenated Words	Hard	1945	arraystringdynamic-programming+2
493	Reverse Pairs	Hard	—	arraybinary-searchdivide-and-conquer+4

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題庫

共 173 道題目含解題說明

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#	題目	難度	Rating	Topics
4	Median of Two Sorted Arrays	Hard	2028	arraybinary-searchdivide-and-conquer
10	Regular Expression Matching	Hard	2025	stringdynamic-programmingrecursion
23	Merge K Sorted Lists	Hard	1893	linked-listdivide-and-conquerheap-priority-queue+1
25	Reverse Nodes in k-Group	Hard	2011	linked-listrecursion
30	Substring with Concatenation of All Words	Hard	2039	hash-tablestringsliding-window
32	Longest Valid Parentheses	Hard	2118	stringdynamic-programmingstack
37	Sudoku Solver	Hard	2313	arrayhash-tablebacktracking+1
41	First Missing Positive	Hard	1944	arrayhash-table
42	Trapping Rain Water	Hard	2062	arraytwo-pointersdynamic-programming+2
44	Wildcard Matching	Hard	2100	stringdynamic-programminggreedy+1
51	N-Queens	Hard	1797	arraybacktracking
52	N-Queens II	Hard	1843	backtracking
60	Permutation Sequence	Hard	1953	mathrecursion
65	Valid Number	Hard	1892	string
68	Text Justification	Hard	1657	arraystringsimulation
76	Minimum Window Substring	Hard	1890	hash-tablestringsliding-window
84	Largest Rectangle in Histogram	Hard	1949	arraystackmonotonic-stack
85	Maximal Rectangle	Hard	2188	arraydynamic-programmingstack+2
87	Scramble String	Hard	2264	stringdynamic-programming
115	Distinct Subsequences	Hard	1849	stringdynamic-programming
123	Best Time to Buy and Sell Stock III	Hard	1977	arraydynamic-programming
124	Binary Tree Maximum Path Sum	Hard	1807	dynamic-programmingtreedepth-first-search+1
127	Word Ladder	Hard	2061	hash-tablestringbreadth-first-search
135	Candy	Hard	1750	arraygreedy
140	Word Break II	Hard	2081	hash-tablestringdynamic-programming+3
149	Max Points on a Line	Hard	1978	arrayhash-tablemath+1
188	Best Time to Buy and Sell Stock IV	Hard	2037	arraydynamic-programming
212	Word Search II	Hard	1976	arraystringbacktracking+2
218	The Skyline Problem	Hard	2452	arraydivide-and-conquerbinary-search+5
224	Basic Calculator	Hard	2010	mathstringstack+1
239	Sliding Window Maximum	Hard	1860	arrayqueuesliding-window+2
269	Alien Dictionary	Hard	1930	arraystringdepth-first-search+3
295	Find Median from Data Stream	Hard	1973	two-pointersdesignsorting+2
297	Serialize and Deserialize Binary Tree	Hard	1884	stringtreedepth-first-search+3
305	Number of Islands II	Hard	1885	arrayhash-tableunion-find+1
312	Burst Balloons	Hard	2056	arraydynamic-programming
315	Count of Smaller Numbers After Self	Hard	2215	arraybinary-searchdivide-and-conquer+4
327	Count of Range Sum	Hard	—	arraybinary-searchdivide-and-conquer+4
329	Longest Increasing Path in a Matrix	Hard	1965	arraydynamic-programmingdepth-first-search+5
330	Patching Array	Hard	2073	arraygreedy
332	Reconstruct Itinerary	Hard	1858	depth-first-searchgrapheulerian-circuit
336	Palindrome Pairs	Hard	2311	arrayhash-tablestring+1
352	Data Stream as Disjoint Intervals	Hard	1700	binary-searchdesignordered-set
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	—	arrayhash-tablemath+2
407	Trapping Rain Water II	Hard	2200	arraybreadth-first-searchheap-priority-queue+1
410	Split Array Largest Sum	Hard	1856	arraybinary-searchdynamic-programming+2
440	K-th Smallest in Lexicographic Order	Hard	1982	trie
460	LFU Cache	Hard	—	hash-tablelinked-listdesign+1
472	Concatenated Words	Hard	1945	arraystringdynamic-programming+2
493	Reverse Pairs	Hard	—	arraybinary-searchdivide-and-conquer+4

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