Topic: Hash Table

alleasymediumhard

alltodoattemptedfailedsolved

589 problems

#	Title	Status	Difficulty	Topics	Accept
1	Two Sum	—	Easy	ArrayHash Table	56%
3	Longest Substring Without Repeating Characters	—	Medium	Hash TableStringSliding Window	37%
12	Integer to Roman	—	Medium	Hash TableMathString	68%
13	Roman to Integerread	—	Easy	Hash TableMathString	65%
17	Letter Combinations of a Phone Number	—	Medium	Hash TableStringBacktracking	64%
30	Substring with Concatenation of All Words	—	Hard	Hash TableStringSliding Window	33%
36	Valid Sudoku	—	Medium	ArrayHash TableMatrix	62%
37	Sudoku Solverread	—	Hard	ArrayHash TableBacktracking	64%
41	First Missing Positive	—	Hard	ArrayHash Table	41%
49	Group Anagrams	—	Medium	ArrayHash TableString	71%
73	Set Matrix Zeroes	—	Medium	ArrayHash TableMatrix	60%
76	Minimum Window Substring	—	Hard	Hash TableStringSliding Window	45%
105	Construct Binary Tree from Preorder and Inorder Traversal	—	Medium	ArrayHash TableDivide and Conquer	67%
106	Construct Binary Tree from Inorder and Postorder Traversal	—	Medium	ArrayHash TableDivide and Conquer	66%
126	Word Ladder II	—	Hard	Hash TableStringBacktracking	27%
127	Word Ladder	—	Hard	Hash TableStringBreadth-First Search	42%
128	Longest Consecutive Sequence	—	Medium	ArrayHash TableUnion Find	47%
133	Clone Graphread	—	Medium	Hash TableDepth-First SearchBreadth-First Search	62%
138	Copy List with Random Pointerread	—	Medium	Hash TableLinked List	60%
139	Word Break	—	Medium	ArrayHash TableString	48%
140	Word Break II	—	Hard	ArrayHash TableString	53%
141	Linked List Cycle	—	Easy	Hash TableLinked ListTwo Pointers	52%
142	Linked List Cycle II	—	Medium	Hash TableLinked ListTwo Pointers	55%
146	LRU Cacheread	—	Medium	Hash TableLinked ListDesign	45%
149	Max Points on a Line	—	Hard	ArrayHash TableMath	29%
160	Intersection of Two Linked Lists	—	Easy	Hash TableLinked ListTwo Pointers	61%
166	Fraction to Recurring Decimal	—	Medium	Hash TableMathString	26%
169	Majority Element	—	Easy	ArrayHash TableDivide and Conquer	66%
187	Repeated DNA Sequences	—	Medium	Hash TableStringBit Manipulation	51%
202	Happy Number	—	Easy	Hash TableMathTwo Pointers	58%
205	Isomorphic Strings	—	Easy	Hash TableString	47%
208	Implement Trie (Prefix Tree)read	—	Medium	Hash TableStringDesign	68%
217	Contains Duplicate	—	Easy	ArrayHash TableSorting	63%
219	Contains Duplicate II	—	Easy	ArrayHash TableSliding Window	49%
229	Majority Element II	—	Medium	ArrayHash TableSorting	54%
242	Valid Anagram	—	Easy	Hash TableStringSorting	66%
264	Ugly Number II	—	Medium	Hash TableMathDynamic Programming	49%
268	Missing Number	—	Easy	ArrayHash TableMath	70%
290	Word Pattern	—	Easy	Hash TableString	43%
299	Bulls and Cowsread	—	Medium	Hash TableStringCounting	51%
336	Palindrome Pairs	—	Hard	ArrayHash TableString	36%
347	Top K Frequent Elementsread	—	Medium	ArrayHash TableDivide and Conquer	64%
349	Intersection of Two Arrays	—	Easy	ArrayHash TableTwo Pointers	76%
350	Intersection of Two Arrays II	—	Easy	ArrayHash TableTwo Pointers	59%
355	Design Twitterread	—	Medium	Hash TableLinked ListDesign	42%
380	Insert Delete GetRandom O(1)read	—	Medium	ArrayHash TableMath	55%
381	Insert Delete GetRandom O(1) - Duplicates allowedread	—	Hard	ArrayHash TableMath	36%
383	Ransom Note	—	Easy	Hash TableStringCounting	64%
387	First Unique Character in a String	—	Easy	Hash TableStringQueue	64%
389	Find the Difference	—	Easy	Hash TableStringBit Manipulation	60%

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