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1,032 Commits
Amazon
Amazon
 
 
Array
Array
 
 
BFS
BFS
 
 
Backtracking
Backtracking
 
 
Binary Search
Binary Search
 
 
Bit Manipulation
Bit Manipulation
 
 
DFS
DFS
 
 
Design
Design
 
 
Divide and Conquer
Divide and Conquer
 
 
Dynamic Programming
Dynamic Programming
 
 
Graph
Graph
 
 
Greedy
Greedy
 
 
HashMap Heap
HashMap Heap
 
 
HashTable
HashTable
 
 
Heap
Heap
 
 
LinkedList
LinkedList
 
 
ListAndTree
ListAndTree
 
 
Math
Math
 
 
Minimax/843. Guess the word
Minimax/843. Guess the word
 
 
Opposite Two Pointers/LintCode 609. Two Sum Less Than or Eqaul to Target
Opposite Two Pointers/LintCode 609. Two Sum Less Than or Eqaul to Target
 
 
Pending
Pending
 
 
Queue
Queue
 
 
Recursion
Recursion
 
 
Same Direction Two Pointers
Same Direction Two Pointers
 
 
Slow Fast Two Pointers
Slow Fast Two Pointers
 
 
Sort
Sort
 
 
Special Problem
Special Problem
 
 
Stack
Stack
 
 
String
String
 
 
SweepLine
SweepLine
 
 
Template
Template
 
 
Thread/1114. Print in Order
Thread/1114. Print in Order
 
 
Topological Sort
Topological Sort
 
 
Tree
Tree
 
 
Trie
Trie
 
 
Two Pointers
Two Pointers
 
 
Union-find
Union-find
 
 
kth Smallest Largest
kth Smallest Largest
 
 
README.md
README.md
 
 
autogen.py
autogen.py
 
 

Repository files navigation

LeetCode

No. # Title Solution Difficulty Solved Date Tag Review Date
1 461 Hamming Distance Java Easy 2017.1.6 Math, Bit manipulation 2018.1.19 2018.6.19
2 412 Fizz Buzz Python Java Easy 2017.1.7 String 2018.1.14 2018.6.19
3 344 Reverse String Java Easy 2017.1.7 Two Pointers, String 2018.1.8 2018.6.19
4 463 Island Perimeter Python Easy 2017.1.8 Array 2018.1.19 2018.6.19 2018.10.10 2018.10.27 2018.11.12
5 448 Find All Numbers Disappeared in an array Java Easy 2017.1.8 Array 2018.1.10 2018.5.14 2018.6.20
6 136 Single Number Python, Java Easy 2017.1.10 Hash Table, Bit Manipulation 2018.5.4 2018.6.19 2018.10.10 2018.10.19 2018.10.30 2019.2.24
7 371 Sum of Two Integers Java Easy 2017.1.10 Bit Manipulation 2018.10.11
8 389 Find the difference Java Easy 2017.1.11 Hash Table, Bit Manipulation 2018.5.18
9 476 Number Complement Python Easy 2017.1.12
10 455 Assign-cookies Python Easy 2017.1.16
11 453 Minimum Moves to Equal Array Elements Java Easy 2017.1.18 Math 2018.1.11
12 118 Pascal's Triangle Java Easy 2017.2.20 Array 2018.1.6
13 21 Merge Two Sorted Lists Java Easy 2017.2.20 Linked List 2017.12.15 2018.1.5 2018.2.10 2018.4.12 2018.7.7 2018.10.12 2018.10.19
14 1 Two Sum Java Easy 2017.3.9 Array, Hash Table 2017.12.13 2018.2.1 2018.2.25 2018.3.25 2018.3.28 2018.4.10 2018.4.16 2018.4.24 2018.5.29 2018.10.14 2019.2.17
15 7 Reverse Integer Java Easy 2017.3.9 Math 2018.10.16
16 9 Palindrome Number Java Easy 2017.3.9 2019.4.22
17 14 Longest Common Prefix Java Easy 2017.3.9 String 2017.12.24 2018.10.16 2018.10.26
18 20 Valid Parentheses Java Easy 2017.3.9 Stack 2018.4.23 2018.10.27 2018.11.12
19 26 Remove Duplicates from Sorted Array Java Easy 2017.3.10 Array 2018.2.11 2018.4.24 2018.6.22 2018.10.14 2018.10.15
20 27 Remove Element Java Easy 2017.3.10
21 28 Implement strStr() Java Easy 2017.3.15 String 2018.3.17
22 35 Search Insert Position Java Easy 2017.3.15
23 38 Count and Say Java Easy 2017.3.16 String 2018.10.15
24 53 Maximum Subarray Java Easy 2017.3.16 Array, Divide and Conquer,Dynamic Programming 2017.12.17 2018.1.23 2018.1.27 2018.2.21 2018.4.17 2018.4.18 2018.5.24 2018.7.10 2018.9.14 2018.9.28 2018.10.14 2018.10.27 2018.11.8
25 58 Length of Last Word Java Easy 2017.3.16
26 66 Plus One Java Easy 2017.3.17 Math. Array 2017.12.14 2018.10.14
27 67 Add Binary Java Easy 2017.3.17 Math, String 2017.12.13 2018.10.15 2018.10.26 2018.11.10
28 69 Sqrt(x) Java Easy 2017.3.17 2018.3.22 2018.11.7
29 88 Merge Sorted Array Java Easy 2017.3.21 Array, Two Pointer 2018.4.24 2018.10.16 2018.11.11
30 101 Symmetric Tree Java Easy 2017.3.21 Tree 2018.1.1 2018.3.15 2018.4.19 2018.5.29 2018.7.9 2018.10.14 2019.3.3
31 119 Pascal's Triangle Ⅱ Java Easy 2017.3.22
32 121 Best Time to Buy and Sell Stock Java Easy 2017.3.23 Array, Dynamic Programming 2017.12.17 2018.1.28 2018.2.21 2018.2.26 2018.4.13 2018.4.17 2018.5.24 2018.7.6 2018.10.12 2019.1.10 2019.2.12
33 122 Best Time to Buy and Sell Stock Ⅱ Java Easy 2017.3.23 Array, Greedy 2017.12.18 2018.2.26 2018.10.11 2019.2.12
34 167 Two Sum Ⅱ - Input array is sorted Java Easy 2017.3.24 Array, Two Pointers, Binary Search 2017.12.13 2018.4.10 2018.4.28 2019.2.17
35 414 Third Maximum Number Java Easy 2017.3.27 Array 2017.11.3 2018.1.8
36 268 Missing Number Java Easy 2017.3.27 2018.6.30
37 485 Max Consecutive Ones Java Easy 2017.3.28 Array 2018.10.27 2019.3.3
38 219 Contains Duplicate Ⅱ Java Easy 2017.3.28 Array, HashMap 2018.2.14 2018.11.3
39 500 Keyboard Row Java Easy 2017.4.1
40 349 Intersection of Two Arrays Java Easy 2017.4.1 Array 2018.10.11 2018.11.11
41 409 Longest Palindrome Java Easy 2017.4.7 HashTable 2018.3.19
42 350 Intersection of Two Arrays Ⅱ Java Easy 2017.4.7 Two Pointers, HashMap 2018.10.12 2018.11.11
43 141 Linked List Cycle Java Easy 2017.5.25 Linked List, Two Pointers 2017.12.15 2018.1.24 2018.2.10 2018.4.10 2018.4.24 2018.10.15 2018.10.18 2019.2.10
44 142 Linked List Cycle Ⅱ Java Medium 2017.5.25 Linked List, Two Pointers 2017.12.25 2018.2.10 2018.4.24 2018.10.18
45 160 Intersection of Two Linked Lists Java Easy 2017.5.25 Linked List 2017.12.23 2018.1.9 2018.2.10 2018.4.10 2018.4.17 2018.10.16
46 234 Palindrome Linked List Java Easy 2017.5.26 Linked List, Two Pointers 2017.12.23 2018.1.24 2018.2.11 2018.4.13
47 203 Remove Linked List Elements Java Easy 2017.5.27 Linked List 2017.12.26 2018.2.11
48 2 Add Two Numbers Java Medium 2017.5.27 Linked List, Math 2017.12.13 2018.1.26 2018.2.11 2018.4.17 2018.9.21 2018.10.21
49 445 Add Two Numbers Ⅱ Java Medium 2017.5.30 Linked List 2017.12.13 2018.1.26 2018.2.12 2018.4.23
50 24 Swap Nodes in Pairs Java Medium 2017.6.2 Linked List 2017.12.25 2018.9.27
51 19 Remove Nth Node From End of List Java Medium 2017.6.2 Linked List 2017.12.25 2018.9.24 2018.10.18
52 147 Insertion Sort List Java Medium 2017.6.7 Linked List, Sort
53 86 Partition List Java Medium 2017.6.7 Linked List, Two Pointers 2018.1.25 2018.10.3
54 92 Reverse Linked List Ⅱ Java Medium 2017.6.8 Linked List 2018.2.12
55 82 Remove Duplicates from Sorted List Ⅱ Java Medium 2017.6.8 Linked List 2018.10.2
56 61 Rotate List Java Medium 2017.6.9 Linked List, Two Pointers 2018.2.12 2018.10.2
57 25 Reverse Nodes in k-Group Java Hard 2017.6.10 Linked List 2018.11.17
58 148 Sort List Java Medium 2017.6.11 Linked List, Sort 2017.12.15 2018.2.13
59 237 Delete Node in a Linked List Java Easy 2017.6.14 Linked List 2017.12.14 2018.2.10 2018.6.30
60 206 Reverse Linked List Java Easy 2017.6.14 Linked List 2017.12.15 2018.1.17 2018.2.8 2018.2.10 2018.3.11 2018.4.10 2018.6.30 2018.9.28 2018.10.11
61 328 Odd Even Linked List Java Medium 2017.6.15 Linked List 2017.12.16 2018.2.11
62 83 Remove Duplicates from Sorted List Java Easy 2017.6.15 Linked List 2017.12.26
63 109 Convert Sorted List to Binary Search Tree Java Medium 2017.6.17 Linked List, DFS 2018.2.12
64 496 Next Greater Element I Java Easy 2017.6.19 Stack, HashMap 2018.1.12
65 503 Next Greater Element II Java Medium 2017.6.19 Stack 2018.1.13
66 94 Binary Tree Inorder Travelsal Java Medium 2017.6.20 Stack 2018.1.4 2018.2.13 2018.3.15 2018.4.3 2018.4.24 2018.5.8 2018.6.8 2018.10.3
67 144 Binary Tree Preorder Travelsal Java Medium 2017.6.22 Stack 2018.1.4 2018.2.13 2018.3.15 2018.4.24 2018.9.28
68 145 Binary Tree Postorder Travelsal Java Hard 2017.6.22 Stack 2018.1.4 2018.2.13 2018.3.15 2018.4.24 2018.10.24
69 394 Decode String Java Medium 2017.6.27 Stack 2018.1.9
70 341 Flatten Nested List Iterator Java Medium 2017.6.27 Design, Stack 2018.1.8 2018.1.28 2018.10.26
71 173 Binary Search Tree Iterator Java Medium 2017.6.27 Stack 2017.12.31 2018.1.7 2018.3.5 2018.4.18 2018.10.23
72 155 Min Stack Java Easy 2017.7.4 Stack 2018.3.7 2018.4.11
73 225 Implement Stack using Queues Java Easy 2017.7.5 Stack 2018.2.27
74 232 Implement Queue using Stacks Java Easy 2017.7.5 Queue 2018.2.27 2018.4.23 2018.7.19
75 331 Verify Preorder Serialization of a Binary Tree Java Medium 2017.7.6 Stack
76 561 Array Partition I Java Easy 2017.7.10 Array 2018.6.25
77 189 Rotate Array Java Easy 2017.7.10 Array 2017.12.10 2018.4.10 2018.6.9 2018.10.27
78 605 Can Place Flowers Java Easy 2017.7.10 Array
79 581 Shortest Unsorted Continuous Subarray Java Easy 2017.7.11 Array
80 566 Reshape the Matrix Java Easy 2017.7.11 Array
81 628 Maximum Product of Three Numbers Java Easy 2017.7.13 Array 2018.1.18
82 105 Construct Binary Tree from Preorder and Inorder Traversal Java Medium 2017.7.14 Array 2017.7.16 2018.1.5 2018.2.13 2018.3.21
83 106 Construct Binary Tree from Inorder and Postorder Traversal Java Medium 2017.7.15 Array 2017.7.16 2018.1.5 2018.2.13 2018.3.21 2018.10.14 2018.10.24
84 532 K-diff Pairs in an Array Java Easy 2017.7.15 Array 2017.7.16 2018.1.8 2018.1.15
85 521 Longest Uncommon Subsequence I Java Easy 2017.7.15 String 2017.7.16
86 606 Construct String from Binary Tree Java Easy 2017.7.15 String
87 125 Valid Palindrome Java Easy 2017.7.15 String 2017.7.17 2018.1.6 2018.3.17 2018.4.24 2018.10.16 2018.10.27 2018.11.11
88 520 Detect Capital Java Easy 2017.7.15 String 2017.7.17 2018.1.10
89 383 Ransom Note Java Easy 2017.7.15 String 2018.9.4
90 551 Student Attendance Record I Java Easy 2017.7.15 String
91 557 Reverse Words in a String III Java Easy 2017.7.18 String 2018.1.19
92 541 Reverse String II Java Easy 2017.7.19 String 2018.1.8
93 459 Repeated Substring Pattern Java Easy 2017.7.19 String 2018.1.15
94 434 Number of Segments in a String Java Easy 2017.7.19 String 2018.1.16
95 345 Reverse Vowels of a String Java Easy 2017.7.20 String 2018.1.16
96 643 Maximum Average Subarray I Java Easy 2017.7.20 Array 2018.1.17
97 594 Longest Harmonious Subsequence Java Easy 2017.7.20 HashTable 2018.1.20
98 575 Distribute Candies Java Easy 2017.7.20 HashTable 2018.1.16
99 447 Number of Boomerangs Java Easy 2017.7.20 HashTable 2018.1.20
100 438 Find All Anagrams in a String Java Easy 2017.7.21 HashMap 2018.1.22 2018.10.10 2018.10.15 2018.10.27 2018.11.10
101 599 Minimum Index Sum of Two Lists Java Easy 2017.7.21 HashMap 2018.1.17
102 205 Isomorphic Strings Java Easy 2017.7.23 Hash Table 2018.1.7 2019.2.4
103 645 Set Mismatch Java Easy 2017.7.23 HashMap, Array 2018.1.14
104 204 Count Primes Java Easy 2017.7.24 HashMap, Math 2018.1.7 2018.3.18
105 290 Word Pattern Java Easy 2017.7.24 HashTable 2018.1.7 2018.5.25 2019.2.20
106 12 Integer to Roman Java Medium 2017.7.27 Math, String 2018.1.4 2018.3.7 2018.9.23 2018.10.28
107 13 Roman to Integer Java Easy 2017.7.27 Math, String 2018.1.4 2018.3.7 2018.6.30 2018.10.11 2018.10.28
108 111 Minimum Depth of Binary Tree Java Easy 2017.7.27 Tree, DFS, BFS 2018.1.4 2018.5.29 2018.10.15
109 617 Merge Two Binary Trees Java Easy 2017.7.31 Tree 2017.12.30 2018.1.14 2018.2.5 2018.4.9 2018.6.8
110 70 Climbing Stairs Java Easy 2017.8.2 Dynamic Programming 2017.12.17 2018.1.5 2018.2.21 2018.3.10 2018.4.17 2018.5.24
111 100 Same Tree Java Easy 2017.8.4 Tree, DFS 2017.12.30 2018.1.5 2018.2.19 2018.4.3
112 169 Majority Element Java Easy 2017.8.6 Array, Divide and Conquer, Bit Manipulation 2018.1.6 2018.2.6 2018.3.2 2018.7.19
113 171 Excel Sheet Column Number Java Easy 2017.8.6 Math 2018.1.7 2018.6.30 2018.10.28
114 690 Employee Importance Java Easy 2017.10.11 DFS 2018.5.28
115 695 Max Area of Island Java Easy 2017.10.12 DFS 2018.1.18
116 693 Binary Number with Alternating Bits Java Easy 2017.10.12 Bit Manipulation
117 347 Top K Frequent Element Java Medium 2017.10.14 Hash Table, Heap 2017.12.16 2018.2.22 2018.2.26 2018.4.24 2018.9.5 2018.10.14 2018.10.23
118 692 Top K Frequent Words Java Medium 2017.10.14 Hash Table, Heap 2018.10.23
119 657 Judge Route Circle Java Easy 2017.10.17 String 2018.8.16
120 303 Range Sum Query - Immutable Java Easy 2017.10.18 Dynamic Programming 2017.12.19 2018.1.29 2018.2.22 2018.11.11
121 387 First Unique Character in a String Java Easy 2017.10.19 String 2018.2.14 2018.4.13 2018.4.15 2018.6.30 2018.10.11
122 108 Convert Sorted Array to Binary Search Tree Java Easy 2017.10.19 Tree, DFS 2018.1.1
123 198 House Robber Java Easy 2017.10.19 Dynamic Programming 2017.12.5 2017.12.18 2018.1.28 2018.2.21 2018.5.24 2019.2.18
124 172 Factorial Trailing Zeroes Java Easy 2017.10.20 Math 2018.9.15
125 7 Reverse Integer Java Easy 2017.10.22 Math
126 190 Reverse Bits Java Easy 2017.10.25 Bit Manipulation
127 3 Longest Substring Without Repeating Characters Java Medium 2017.10.27 HashTable, Two Pointers, String 2018.1.22 2018.9.6 2018.9.21 2018.10.17 2018.10.23 2018.11.15 2019.1.10
128 50 Pow(x, n) Java Medium 2017.11.1 Math 2018.3.19 2018.10.1 2018.11.3 2018.11.7 2018.11.12
129 374 Guess Number Higher or Lower Java Easy 2017.11.2 Binary Search 2018.3.22 2018.10.12 2019.2.25
130 242 Valid Anagram Java Easy 2017.11.4 Hash Table, Sort 2018.10.11
131 110 Balanced Binary Tree Java Easy 2017.11.5 Tree, DFS 2017.12.31 2018.4.26 2018.10.14 2018.10.24 2018.11.13
132 168 Excel Sheet Column Title Java Easy 2017.11.5 Math 2018.1.3
133 11 Container With Most Water Java Medium 2017.11.7 Array, Two Pointers 2018.1.3 2018.9.23
134 238 Product of Array Except Self Java Medium 2017.11.8 Array 2018.1.4 2018.4.17 2018.10.27 2018.11.9 2018.11.11
135 5 Longest Palindromic Substring Java Medium 2017.11.11 String 2018.1.3 2018.3.19 2018.4.17 2018.9.23
136 580 Count Student Number in Departments SQL Medium 2017.11.11 Database 2018.1.2
137 243 Shortest Word Distance Java Easy 2017.11.12 Array 2018.1.2
138 661 Image Smoother Java Easy 2017.11.12 Array 2018.1.3
139 586 Customer Placing the Largest Number of Orders SQL Easy 2017.11.12 Database
140 595 Big Countries SQL Easy 2017.11.12 Database 2018.2.5
141 339 Nested List Weight Sum Java Easy 2017.11.13 DFS 2018.1.8 2018.2.19 2018.10.4 2018.10.19
142 728 Self Dividing Numbers Java Easy 2017.11.20 Math
143 346 Moving Average from Data Stream Java Easy 2017.11.20 Design, Queue 2018.10.6 2018.10.28
144 266 Palindrome Permutation Java Easy 2017.11.20 HashMap 2018.10.10 2018.10.19
145 682 Baseball Game Java Easy 2017.11.20 Stack 2018.4.10
146 669 Trim a Binary Search Tree Java Easy 2017.11.20 Tree
147 293 Flip Game Java Easy 2017.11.21 String
148 637 Average of Levels in Binary Tree Java Easy 2017.11.21 Tree
149 696 Count Binary Substrings Java Easy 2017.11.22 String
150 717 1-bit and 2-bit Characters Java Easy 2017.11.24 Array
151 653 Two Sum IV Java Easy 2017.11.24 Tree 2017.12.13 2018.4.19 2019.2.17
152 252 Meeting Rooms Java Easy 2017.11.25 Sort 2018.10.11 2018.10.26
153 504 Base 7 Java Easy 2017.11.25 Math 2018.2.3
154 477 Total Hamming Distance Java Easy 2017.11.25 Math, Bit manipulation
155 112 Path Sum Java Easy 2017.11.25 Tree, DFS 2018.3.15 2018.5.6
156 734 Sentence Similarity Java Easy 2017.11.25 Hash Table 2018.9.12
157 733 Flood Fill Java Easy 2017.11.25 DFS 2018.10.11 2019.4.12
158 735 Asteroid Collision Java Medium 2017.11.26 Stack
159 170 Two Sum III Java Easy 2017.11.26 Hash Table, Design 2017.12.13 2018.10.16 2019.1.11 2019.2.17
160 256 Paint House Java Easy 2017.11.27 Dynamic Programming 2017.12.19 2018.1.28 2018.2.21 2018.5.23
161 342 Power of Four Java Easy 2017.11.27 Bit Manipulation
162 231 Power of Two Java Easy 2017.11.27 Math, Bit Manipulation
163 326 Power of Three Java Easy 2017.11.27 Math
164 654 Maximum Binary Tree Java Medium 2017.11.27 Stack 2018.11.17
165 191 Number of 1 Bits Java Easy 2017.11.27 Bit manipulation 2018.7.14 2018.9.8
166 624 Maximum Distance in Arrays Java Easy 2017.11.27 Array
167 197 Rising Temperature SQL Easy 2017.11.27 Database
168 96 Unique Binary Search Trees Java Easy 2017.11.28 Dynamic Programming, Tree 2017.12.19 2017.12.31 2018.5.9 2018.10.3
169 338 Counting Bits Java Medium 2017.11.29 Dynamic Programming, Bit manipulation 2017.12.18 2019.1.27
170 257 Binary Tree Paths Java Easy 2017.11.29 Tree, DFS 2018.10.12 2018.10.24 2018.11.11
171 404 Sum of Left Leaves Java Easy 2017.11.29 Tree 2018.3.5 2018.4.2 2019.3.1
172 739 Daily Temperatures Java Medium 2017.12.2 Stack 2017.12.4 2019.2.27
173 738 Monotone Incresing Digits Java Medium 2017.12.2 Greedy 2017.12.4
174 6 ZigZag Conversion Java Medium 2017.12.7 String 2018.9.23
175 15 3Sum Java Medium 2017.12.7 Array, Two Pointers 2018.3.26 2018.3.28 2018.3.29 2018.9.23 2018.10.25 2018.11.10 2019.2.17
176 16 3Sum Closest Java Medium 2017.12.8 Array, Two Pointers 2018.3.29 2018.9.23 2019.2.17
177 259 3Sum Smaller Java Medium 2017.12.8 Array, Two Pointers 2018.3.29 2018.11.26 2019.2.17
178 18 4Sum Java Medium 2017.12.8 Array, Two Pointers 2018.9.24 2019.2.17
179 454 4Sum II Java Medium 2017.12.8 Array, Hash Table
180 287 Find the Duplicate Number Java Medium 2017.12.8 Array, Two Pointers, Binary Search 2018.3.31 2018.4.17 2018.11.7
181 80 [Remove Duplicates from Sorted Array II][80] Java Medium 2017.12.8 Array, Two Pointers 2018.10.2
182 107 Binary Tree Level Order Traversal II Java Easy 2017.12.9 Tree, BFS 2018.2.13 2018.3.15 2018.4.24 2018.5.29
183 278 First Bad Version Java Easy 2017.12.9 Binary Search 2018.3.22 2018.10.16
184 744 [Find Smallest Letter Greater Than Target][744] Java Easy 2017.12.9
185 17 Letter Combinations of a Phone Number Java Medium 2017.12.10 String, Backtracking 2018.4.24 2018.9.24 2018.10.27 2018.11.12 2018.12.5
186 151 Reverse Words in a String Java Medium 2017.12.10 String 2018.2.16 2018.10.26
187 186 Reverse Words in a String II Java Medium 2017.12.10 String 2018.2.16 2018.4.16
188 22 Generate Parentheses Java Medium 2017.12.10 String, Backtracking 2018.9.24 2018.10.28
189 437 Path Sum III Java Easy 2017.12.10 Tree 2018.5.6 2018.10.14 2018.11.18
190 458 Poor Pigs Java Easy 2017.12.11 Math
191 720 Longest Word in Dictionary Java Easy 2017.12.12 HashTable, Trie
192 538 Convert BST to Greater Tree Java Easy 2017.12.12 Tree
193 544 Output Contest Matches Java Medium 2017.12.12 String
194 419 Battleships in a Board Java Medium 2017.12.12 Array 2018.5.23
195 415 Add Strings Java Easy 2017.12.13 Math 2018.10.14 2018.11.12
196 208 Implement Trie (Prefix Tree) Java Medium 2017.12.14 Design Trie
197 211 Add and Search Word - Data structure design Java Medium 2017.12.14 Backtracking, Design, Trie 2018.10.22 2018.11.11
198 369 Plus One Linked List Java Medium 2017.12.14 Linked List 2018.2.8 2018.2.11
199 104 Maximum Depth of Binary Tree Java Easy 2017.12.15 Tree, DFS 2017.12.30 2018.1.5 2018.2.17 2018.10.15
200 202 Happy Number Java Easy 2017.12.15 Hash Table, Math
201 725 Split Linked List in Parts Java Medium 2017.12.16 Linked List 2018.12.5
202 215 Kth Largest Element in an Array Java Medium 2017.12.16 Divide and Conquer, Heap 2018.4.2 2018.10.18 2018.11.11 2019.1.14 2019.2.18 2019.2.27
203 748 Shortest Completing Word Java Easy 2017.12.16 Hash Table
204 740 Delete and Earn Java Medium 2017.12.6 Dynamic Programming 2017.12.17 2018.1.9
205 746 Min Cost Climbing Stairs Java Easy 2017.12.17 Dynamic Programming 2018.1.27 2018.2.21 2018.4.12 2018.5.1 2018.5.23ff
206 276 Paint House Java Easy 2017.12.17 Dynamic Programming 2018.1.29
207 91 Decode Ways Java Medium 2017.12.18 Dynamic Programming 2018.10.3 2018.10.10 2018.10.27 2018.11.11 2018.11.17 2019.2.27
208 213 House Robber II Java Medium 2017.12.19 Dynamic Programming 2018.11.10 2019.2.18
209 337 House Robber III Java Medium 2017.12.19 Dynamic Programming 2018.11.10
210 647 Palindromic Substrings Java Medium 2017.12.19 Dynamic Programming
211 413 Arithmetic Slices Java Medium 2017.12.20 Dynamic Programming
212 712 Minimum ASCII Delete Sum for Two Strings Java Medium 2017.12.20 Dynamic Programming
213 357 Count Numbers with Unique Digits Java Medium 2017.12.20 Dynamic Programming
214 62 Unique Paths Java Medium 2017.12.20 Dynamic Programming 2018.1.30 2018.3.7 2018.10.2 2019.1.16 2019.3.8
215 63 Unique Paths II Java Medium 2017.12.20 Dynamic Programming 2018.1.30 2018.3.7 2018.6.9 2018.10.2 2019.3.9
216 64 Minimum Path Sum Java Medium 2017.12.21 Dynamic Programming 2018.10.1 2018.10.13 2019.3.9
217 120 Triangle Java Medium 2017.12.21 Dynamic Programming
218 139 Word Break Java Medium 2017.12.21 Dynamic Programming 2018.5.17 2018.5.26 2019.2.17
219 258 Add Digits Java Easy 2016.3.21 Math 2017.12.21 2018.6.30
220 401 Binary Watch Java Easy 2017.12.21 2017.12.22 Bit manipulation Backtracking
221 52 N-Queens II Java Hard 2017.12.22 Backtracking
222 51 N-Queens Java Hard 2017.12.22 Backtracking
223 152 Maximum Product Subarray Java Medium 2017.12.22 Dynamic Programming 2018.4.29 2019.1.10 2019.3.8
224 474 [Ones and Zeroes][474] Java Medium 2017.12.23 Dynamic Programming 2019.2.14
225 79 Word Search Java Medium 2017.12.25 Array, Backtracking 2018.5.25 2018.10.2 2018.11.9 2019.2.20
226 674 Longest Continuous Increasing Subsequence Java Easy 2017.12.25 Array 2018.10.12 2018.11.3 2018.11.6 2018.11.12 2019.3.8
227 175 Combine Two Tables SQL Easy 2017.12.27 DataBase
228 176 Second Highest Salary SQL Easy 2017.12.27 DataBase
229 177 Nth Highest Salary SQL Medium 2017.12.27 DataBase
230 178 Rank Scores SQL Medium 2017.12.27 DataBase
231 180 Consecutive Numbers SQL Medium 2017.12.27 DataBase
232 181 Employees Earning More Than Their Managers SQL Easy 2017.12.27 DataBase
233 182 Duplicate Emails SQL Easy 2017.12.27 DataBase
234 183 Customers Who Never Order SQL Easy 2017.12.27 DataBase
235 184 Department Highest Salary SQL Medium 2017.12.27 DataBase
236 677 Map Sum Pairs Java Medium 2017.12.28 Trie
237 676 Implement Magic Dictionary Java Medium 2017.12.29 Trie
238 185 Department Top Three Salaries SQL Hard 2017.12.29 DataBase
239 196 Delete Duplicate Emails SQL Easy 2017.12.29 DataBase
240 627 Swap Salary SQL Easy 2017.12.29 DataBase
241 648 Replace Words Java Medium 2017.12.29 Trie
242 421 Maximum XOR of Two Numbers in an Array Java Medium 2017.12.30 Bit Manipulation
243 620 Not Boring Movies SQL Easy 2017.12.30 DataBase
244 619 Biggest Single Number SQL Easy 2017.12.30 DataBase
245 226 Invert Binary Tree Java Easy 2017.12.30 Tree 2018.1.11 2018.2.5 2018.5.7 2018.5.16 2018.11.18
246 235 Lowest Common Ancestor of a Binary Search Tree Java Easy 2017.12.31 Tree 2018.4.12 2018.7.19 2018.9.16 2018.10.24
247 613 Shortest Distance in a Line SQL Easy 2017.12.31 DataBase
248 577 Employee Bonus SQL Easy 2017.12.31 DataBase
249 584 Find Customer Referee SQL Easy 2017.12.31 DataBase
250 124 Binary Tree Maximum Path Sum Java Hard 2018.1.1 Tree 2018.2.9 2018.11.11
251 244 Shortest Word Distance II Java Medium 2018.1.2 HashTable, Array
252 245 Shortest Word Distance III Java Medium 2018.1.2 Array
253 229 Majority Element II Java Medium 2018.1.6 Array 2018.3.2
254 570 Managers with at Least 5 Direct Reports SQL Medium 2018.1.6 DataBase
255 596 Classes More Than 5 Students SQL Easy 2018.1.6 DataBase
256 56 Merge Intervals Java Medium 2018.1.6 Array 2018.2.16 2018.4.23 2018.10.1 2018.10.27 2018.11.11
257 610 Triangle Judgement SQL Easy 2018.1.9 DataBase
258 607 Sales Person SQL Easy 2018.1.11 DataBase
259 556 Next Greater Element III Java Medium 2018.1.13 String 2018.11.3 LC31 Next Permutation
260 72 Edit Distance Java Hard 2018.1.18 Dynamic Programming 2019.1.15
261 283 Move Zeroes Java Easy 2018.1.18 Array, Two Pointers 2018.10.11 2018.11.11
262 766 Toeplitz Matrix Java Easy 2018.1.21 Array
263 769 Max Chunks To Make Sorted Java Medium 2018.1.21 Array
264 76 Minimum Window Substring Java Hard 2018.1.23 HashTable, Two Pointers, String 2018.10.26
265 159 Longest Substring with At Most Two Distinct Characters Java Hard 2018.1.23 HashTable, Two Pointers, String 2018.10.18
266 340 Longest Substring with At Most K Distinct Characters Java Hard 2018.1.23 HashTable, Two Pointers, String 2018.10.18 2018.10.27 2018.11.15
267 697 Degree of an Array Java Easy 2018.1.23 Array
268 608 Tree Node SQL Medium 2018.1.25 DataBase 2018.3.30
269 775 Global and Local Inversions Java Medium 2018.1.29 Array, Math
270 750 Number of Corner Rectangles Java Medium 2018.1.30 Dynamic Programming 2018.2.21
271 42 Trapping Rain Water Java Hard 2018.1.30 Array, Dynamic Programming, Two pointers, Stack 2018.10.22 2019.1.28
272 217 Contains Duplicate Java Easy 2018.2.2 Array, HashMap 2018.2.14
273 537 Complex Number Multiplication Java Medium 2018.2.4 String, Math
274 598 Range Addition II Java Easy 2018.2.5 Math
275 771 Jewels and Stones Java Easy 2018.2.5 Hash Table 2018.2.24 2018.4.9
276 779 K-th Symbol in Grammar Java Medium 2018.2.7 Recursion
277 783 Minimum Distance Between BST Nodes Java Easy 2018.2.10 Tree
278 781 Rabbits in Forrest Java Medium 2018.2.10 HashTable
279 300 [Longest Increasing Subsequence][300] Java Medium 2018.2.11 Binary Search, Dynamic Programming 2018.2.23 2018.3.2 2018.11.12 2019.1.27 2019.2.14
280 143 Reorder List Java Medium 2018.2.12 LinkedList 2018.8.9 2018.10.28 2018.11.11
281 379 Design Phone Directory Java Medium 2018.2.12 LinkedList, Design 2018.11.17
282 102 Binary Tree Level Order Traversal Java Medium 2018.2.13 Tree, BFS 2018.4.14 2018.4.17 2018.4.24 2018.6.1 2018.9.15 2018.10.3
283 138 Copy List with Random Pointer Java Medium 2018.2.13 LinkedList, HashTable 2018.10.6 2018.10.27 2019.1.12
284 161 One Edit Distance Java Medium 2018.2.20 String 2018.10.27 2019.1.15
285 384 Shuffle an Array Java Medium 2018.2.21 Design
286 364 Nested List Weight Sum II Java Medium 2018.2.22 DFS 2019.3.15
287 103 Binary Tree Zigzag Level Order Traversal Java Medium 2018.2.22 BFS, Tree 2018.4.24 2018.10.3 2018.10.24
288 516 Longest Palindromic Subsequence Java Medium 2018.2.23 Dynamic Programming 2018.3.19 2019.2.9
289 322 Coin Change Java Medium 2018.2.24 Dynamic Programming 2019.1.16 2019.2.28 2019.3.8
290 75 Sort Colors Java Medium 2018.2.28 Sort 2018.4.4 2018.10.2
291 435 Non-overlapping Intervals Java Medium 2018.2.28 Greedy
292 134 Gas Station Java Medium 2018.3.1 Greedy 2019.2.17
293 518 Coin Change 2 Java Medium 2018.3.1 Dynamic Programming
294 723 Longest Continuous Increasing Subsequence Java Easy 2018.3.1 Array
295 200 Number of Islands Java Medium 2018.3.4 DFS, BFS, Union-find 2018.4.4 2018.11.12 2019.1.12
296 543 Diameter of Binary Tree Java Easy 2018.3.6 DFS, Tree 2018.10.12 2018.10.24 2018.11.11
297 671 Second Minimum Node In a Binary Tree Java Easy 2018.3.6 BFS, Tree 2018.5.25
298 270 Closest Binary Search Tree Value Java Easy 2018.3.6 Binary Search, Tree 2018.3.8 2018.6.11 2018.7.9 2018.10.14 2018.10.24 2018.11.13
299 563 Binary Tree Tilt Java Easy 2018.3.8 Tree
300 572 Subtree of Another Tree Java Easy 2018.3.8 Tree 2018.4.23 2018.10.24
301 501 Find Mode in Binary Search Tree Java Easy 2018.3.9 Tree
302 687 Longest Univalue Path Java Easy 2018.3.10 Tree
303 513 Find Bottom Left Tree Value Java Medium 2018.3.12 Tree 2018.5.30
304 366 Find Leaves of Binary Tree Java Medium 2018.3.13 Tree
305 796 Rotate String Java Easy 2018.3.14 String
306 515 Find Largest Value in Each Tree Row Java Medium 2018.3.14 Tree 2018.5.30
307 250 Count Univalue Subtrees Java Medium 2018.3.16 Tree
308 280 Wiggle Sort Java Medium 2018.3.20 Array, Sort 2018.5.23
309 116 Populating Next Right Pointers in Each Node Java Medium 2018.3.21 Tree
310 33 Search in Rotated Sorted Array Java Medium 2018.3.22 Binary Search 2018.3.27 2018.4.24 2018.9.29 2018.10.10 2018.10.26 2018.11.7 2018.11.12
311 162 Find Peak Element Java Medium 2018.3.23 Binary Search 2018.8.17 2018.11.6 2019.2.24
312 658 Find K Closest Elements Java Medium 2018.3.27 Binary Search, Two Pointers 2018.8.2 2018.8.17 2018.10.27
313 127 Word Ladder Java Medium 2018.4.6 BFS 2018.4.14 2018.4.23 2018.5.26 2018.6.25 2018.11.13 2019.2.20
314 207 Course Schedule Java Medium 2018.4.6 Topological Sort 2018.6.6 2018.11.13
315 210 Course Schedule II Java Medium 2018.4.7 Topological Sort 2018.4.10 2018.6.6 2018.11.13
316 78 Subsets Java Medium 2018.4.7 DFS 2018.4.13 2018.10.1 2018.10.13 2018.10.26
317 31 Next Permutation Java Medium 2018.4.8 Array 2018.11.10
318 46 Permutations Java Medium 2018.4.8 Backtracking 2018.7.12 2018.10.1 2018.10.27
319 716 Max Stack Java Hard 2018.4.11 Stack, Design
320 451 Sort Character By Frequency Java Medium 2018.4.11 Heap, HashMap
321 98 Validate Binary Search Tree Java Medium 2018.4.11 DFS, Tree 2018.4.21 2018.10.23 2018.11.11 2018.11.13
322 763 Partition Labels Java Medium 2018.4.11 Greedy, Two Pointers
323 236 Lowest Common Ancestor of a Binary Tree Java Medium 2018.4.12 Tree 2018.9.16 2018.10.24
324 133 Clone Graph Java Medium 2018.4.12 Graph, DFS, BFS 2018.10.27
325 535 Encode and Decode TinyURL Java Medium 2018.4.13 HashTable, Math
326 817 Linked List Components Java Medium 2018.4.14 Linked List 2018.6.21
327 23 Merge k Sorted Lists Java Hard 2018.4.15 Linked List, Heap 2018.4.17 2018.7.7 2018.7.11 2018.10.28
328 325 Maximum Size Subarray Sum Equals k Java Medium 2018.4.16 HashMap 2018.5.14 2018.10.28 2018.11.12
329 165 Compare Version Numbers Java Medium 2018.4.16 String
330 285 Inorder Successor in BST Java Medium 2018.4.17 Tree 2018.10.24
331 323 Number of Connected Components in an Undirected Graph Java Medium 2018.4.20 Union Find, DFS, BFS, Graph 2018.5.30
332 48 Rotate Image Java Medium 2018.4.23 Array 2018.10.1 2018.11.5
333 680 Valid Palindrome II Java Easy 2018.4.24 String 2018.10.15 2018.10.26 2018.11.10
334 560 Subarray Sum Equals K Java Medium 2018.4.24 Array, Hash Table 2018.10.28 2018.11.10
335 39 Combination Sum Java Medium 2018.4.24 Array, Backtracking 2018.10.1 2018.10.25 2019.2.5 2019.2.24
336 40 Combination Sum II Java Medium 2018.4.24 Array, Backtracking 2018.10.1 2018.10.27 2019.2.5 2019.2.24
337 153 Find Minimum in Rotated Sorted Array Java Medium 2018.4.26 Array, Binary Search 2018.8.17 2018.11.7
338 114 Flatten Binary Tree to Linked List Java Medium 2018.4.27 Tree, DFS 2018.11.13
339 824 Goat Latin Java Easy 2018.5.2 String 2018.10.10 2018.10.19
340 444 Sequence Reconstruction Java Medium 2018.5.3 Graph, Topological Sort
341 397 Integer Replacement Java Medium 2018.5.3 Math, Bit Manipulation
342 137 [Single Number II][137] Java Medium 2018.5.4 HashTable, Bit Manipulation、 2018.10.30
343 742 Closest Leaf in a Binary Tree Java Medium 2018.5.5 Tree
344 113 Path Sum II Java Medium 2018.5.6 Tree, DFS
345 95 Unique Binary Search Tree II Java Medium 2018.5.9 Tree, Divide and Conquar
346 199 Binary Tree Right Side View Java Medium 2018.5.10 Tree, BFS, DFS 2018.6.1 2018.10.24 2018.11.5 2018.11.11
347 370 Range Addition Java Meidum 2018.5.11 Array
348 406 Queue Reconstruction by Height Java Medium 2018.5.11 Greedy
349 531 [Lonely Pixel I][531] Java Medium 2018.5.11 Array, DFS
350 281 Zigzag Iterator Java Medium 2018.5.12 Design 2018.11.17
351 530 Minimum Absolute Difference in BST Java Easy 2018.5.13 Binary Search Tree
352 506 Relative Ranks Java Easy 2018.5.14 Array
353 298 Binary Tree Longest Consecutive Sequence Java Medium 2018.5.14 Tree 2019.2.11
354 378 Kth Smallest Element in a Sorted Matrix Java Medium 2018.5.15 Binary Search, Heap 2018.10.18
355 665 Non-decreasing Array Java Easy 2018.5.15 Array
356 686 Repeated String Match Java Easy 2018.5.17 String 2018.5.18
357 422 Valid Word Square Java Easy 2018.5.17 String
358 361 Bomb Enemy Java Medium 2018.5.17 Dynamic Programming
359 482 License Key Formating Java Easy 2018.5.18 String
360 246 Strobogrammatic Number Java Easy 2018.5.19 Hash Table, Math 2018.10.14 2018.11.12
361 838 Push Dominoes Java Medium 2018.5.20 String
362 836 Rectangle Overlap Java Easy 2018.5.20 Math
363 507 Perfect Number Java Easy 2018.5.20 Math
364 784 Letter Case Permutation Java Easy 2018.5.21 Backtracking
365 443 String Compression Java Easy 2018.5.21 String 2018.10.28
366 408 Valid Word Abbreviation Java Easy 2018.5.21 String 2018.10.26 2018.11.17
367 724 Find Pivot Index Java Easy 2018.5.21 Array
368 633 Sum Of Square Numbers Java Easy 2018.5.22 Math
369 367 Valid Perfect Square Java Easy 2018.5.22 Math, Binary Search
370 405 Convert a Number to Hexadecimal Java Easy 2018.5.22 Bit Manipulation
371 767 Reorganize String Java Medium 2018.5.23 String, Heap, Greedy, Sort 2019.3.6
372 441 Arranging Coins Java Easy 2018.5.24 Math, Binary Search
373 255 Verify Preorder Sequence in Binary Search Tree Java Medium 2018.5.26 Stack, Tree
374 841 Keys and Rooms Java Medium 2018.5.27 DFS, Graph
375 813 Largest Sum of Averages Java Medium 2018.5.28 Dynamic Programming
376 490 The Maze Java Medium 2018.5.31 BFS, DFS 2019.3.3
377 752 Open the lock Java Medium 2018.6.1 BFS 2018.6.4 2018.6.13 2019.2.16
378 505 The Maze II Java Medium 2018.6.2 BFS, Heap 2019.3.3
379 844 Backspace String Compare Java Easy 2018.6.3 Two Pointers, Stack 2019.2.17 2019.2.27
380 845 Longest Mountain in Array Java Medium 2018.6.3 Two Pointers 2018.9.20 2019.2.18
381 846 Hand of Straights Java Medium 2018.6.6 Map 2018.6.14
382 729 My Calendar I Java Medium 2018.6.7 TreeMap 2018.6.13 2018.10.27 2019.3.3
383 731 My Calendar II Java Medium 2018.6.7 TreeMap 2018.6.14
384 271 Encode and Decode Strings Java Medium 2018.6.9 String 2018.6.13
385 849 Maximize Distance to Closest Person Java Easy 2018.6.10 Array
386 848 Shifting Letters Java Medium 2018.6.10 String
387 851 Loud and Rich Java Medium 2018.6.10 DFS
388 297 Serialize and Deserialize Binary Tree Java Hard 2018.6.12 Tree, Design 2018.6.13 2018.10.24
389 826 Most Profit Assigning Work Java Medium 2018.6.12 Two Pointers 2018.6.13 2018.8.10
390 842 [Split Array into Fibonacci Sequence][842] Java Medium 2018.6.14 String, Backtracking, Greedy 2018.6.15
391 604 Design Compressed String Iterator Java Easy 2018.6.16 Design
392 852 Peak Index in a Mountain Array Java Easy 2018.6.17 Binary Search
393 853 Car Fleet Java Medium 2018.6.17 Array 2019.2.17
394 855 Exam Room Java Medium 2018.6.17 Design 2018.6.19
395 801 Minimum Swaps To Make Sequences Increasing Java Medium 2018.6.18 Dynamic Programming 2018.6.19
396 126 Word Ladder II Java Hard 2018.6.23 BFS 2019.2.20
397 859 Buddy Strings Java Easy 2018.6.24 String
398 856 Score of Parentheses Java Medium 2018.6.24 DFS
399 825 Friends Of Appropriate Ages Java Medium 2018.6.25 Array
400 792 Number of Matching Subsequences Java Medium 2018.6.26 Array
401 583 Delete Operation for Two Strings Java Medium 2018.6.27 String, Dynamic Programming
402 146 LRU Cache Java Hard 2018.6.28 Design 2018.7.5 2018.8.8 2018.10.27
403 4 Median of Two Sorted Arrays Java Hard 2018.6.29 Array, Binary Search 2018.6.30 2018.10.27 2018.11.15 2019.2.24
404 860 Lemonade Change Java Easy 2018.7.1 Array
405 861 Score After Flipping Matrix Java Medium 2018.7.6 Greedy
406 867 Transpose Matrix Java Easy 2018.7.8 Array
407 866 Smallest Subtree with all the Deepest Nodes Java Medium 2018.7.8 Tree
408 47 Permutations II Java Medium 2018.7.12 Backtracking 2018.10.1 2018.10.27
409 868 Binary Gap Java Easy 2018.7.15 Bit Manipulation
410 869 Reordered Power of 2 Java Medium 2018.7.15 DFS, Bit Manipulation
411 470 Implement Rand10 Using Rand7 Java Medium 2018.7.16 Random, Math
412 871 Minimum Number of Refueling Stops Java Hard 2018.7.16 Dynamic Programming 2018.8.8
413 709 To Lower Case Java Easy 2018.7.21 String
414 492 Construct the Rectangle Java Easy 2018.7.21 Array
415 872 Leaf-Similar Trees Java Easy 2018.7.23 Tree
416 874 Walking Robot Simulation Java Easy 2018.7.23 Array
417 873 Length of Longest Fibonacci Subsequence Java Medium 2018.7.24 Dynamic Programming, Array
418 875 Koko Eating Bananas Java Medium 2018.7.24 Binary Search
419 540 Single Element in a Sorted Array Java Medium 2018.7.25 Array
420 700 Search in a Binary Search Tree Java Easy 2018.7.26 Tree
421 429 N-ary Tree Level Order Traversal Java Easy 2018.7.26 Tree, BFS 2019.2.10
422 528 Random Pick with Weight Java Medium 2018.7.30 Binary Search, Random
423 876 Middle of the Linked List Java Easy 2018.7.30 Linked List 2018.10.18
424 877 Stone Game Java Medium 2018.7.30 Math, Dynamic Programming 2018.11.9
425 478 Generate Random Point in a Circle Java Medium 2018.7.31 Math, Random, Rejection Sampling
426 704 Binary Search Java Easy 2018.8.1 Binary Search
427 123 Best Time to Buy and Sell Stock III Java Hard 2018.8.2 Dynamic Programming, Array 2019.1.28 2019.2.12
428 809 Expressive Words Java Medium 2018.8.3 String 2019.2.10
429 887 Projection Area of 3D Shapes Java Easy 2018.8.5 Math
430 881 Boats to Save People Java Medium 2018.8.5 Greedy, Two Pointers 2018.8.15
431 880 Decoded String at Index Java Medium 2018.8.7 String
432 673 Number of Longest Increasing Subsequence Java Medium 2018.8.9 Dynamic Programming
433 884 Uncommon Words from Two Sentences Java Easy 2018.8.15 Hash Table
434 179 Largest Number Java Meidum 2018.8.19 Sort 2018.9.15
435 888 Fair Candy Swap Java Easy 2018.8.19 Array
436 889 Construct Binary Tree from Preorder and Postorder Traversal Java Medium 2018.8.20 Tree
437 890 Find and Replace Pattern Java Medium 2018.8.20 String 2019.2.27
438 886 Possible Bipartition Java Medium 2018.8.21 DFS
439 885 Spiral Matrix III Java Medium 2018.8.22 Math 2018.10.22
440 703 Kth Largest Element in a Stream Java Easy 2018.8.22 Heap 2018.10.18 2019.2.18
441 559 Maximum Depth of N-ary Tree Java Easy 2018.8.23 Tree, DFS, BFS
442 589 N-ary Tree Preorder Traversal Java Easy 2018.8.24 Tree
443 590 N-ary Tree Postorder Traversal Java Easy 2018.8.24 Tree
444 892 Surface Area of 3D Shapes Java Easy 2018.8.27 Math
445 893 Groups of Special-Equivalent Strings Java Easy 2018.8.28 String
446 894 All Possible Full Binary Trees Java Medium 2018.8.28 Tree
447 253 Meeting Rooms II Java Medium 2018.8.29 Heap, Greedy, Sort 2018.10.19 2018.10.26 2018.11.10 2019.1.7 2019.1.14
448 54 Spiral Matrix Java Medium 2018.8.29 Array 2018.10.1 2018.10.22
449 59 Spiral Matrix II Java Medium 2018.8.29 Array 2018.10.1 2018.10.22
450 681 Next Closest Time Java Medium 2018.8.30 String 2019.1.15
451 49 Group Anagrams Java Medium 2018.8.31 HashTable 2018.10.1 2018.10.10
452 896 Monotonic Array Java Easy 2018.9.1 Array 2018.10.11 2018.10.19
453 897 Incresing Order Search Tree Java Easy 2018.9.1 Tree
454 898 Bitwise ORs of Subarrays Java Medium 2018.9.1 Dynamic Programming
455 227 Basic Calculator II Java Medium 2018.9.3 String 2018.10.27
456 240 Search a 2D Matrix II Java Medium 2018.9.4 Binary Search 2018.11.7
457 621 Task Scheduler Java Medium 2018.9.5 Array, Greedy, Queue 2018.10.15 2018.11.10 2019.1.7
458 220 Contains Duplicate III Java Medium 2018.9.6 Binary Search Tree
459 900 RLE Iterator Java Medium 2018.9.13 Array
460 264 Ugly Number II Java Medium 2018.9.15 Math, Dynamic Programming, Heap
461 905 Sort Array By Parity Java Easy 2018.9.15 Array
462 904 Fruit Into Baskets Java Medium 2018.9.15 Two Pointers 2019.1.14
463 907 Sum of Subarray Minimums Java Medium 2018.9.15 Stack
464 906 Super Palindromes Java Hard 2018.9.17 Math
465 698 Partition to K Equal Sum Subsets Java Medium 2018.9.21 Recursion
466 911 Online Election Java Medium 2018.9.23 HashTable 2019.3.6
467 910 Smallest Range II Java Medium 2018.9.22 Array
468 909 Snakes and Ladders Java Medium 2018.9.22 BFS
469 908 Smallest Range I Java Medium 2018.9.22 Array
470 34 Find First and Last Position of Element in Sorted Array Java Medium 2018.9.22 Binary Search 2018.10.26 2018.11.12
471 81 Search in Rotated Sorted Array II Java Medium 2018.10.2 Binary Search 2018.10.10 2018.10.26 2018.11.7 2019.2.21
472 157 Read N Characters Given Read4 Java Easy 2018.10.4 String 2018.10.28 2018.11.12 2019.3.2
473 260 Single Number III Java Medium 2018.10.4 Bit Manipulation 2018.10.30
474 277 Find the Celebrity Java Medium 2018.10.4 Array 2018.10.27 2018.11.11 2019.2.27
475 392 Is Subsequence Java Medium 2018.10.5 Binary Search, Two Pointers
476 721 Accounts Merge Java Medium 2018.10.6 Union Find, DFS 2018.10.25 2018.11.11
477 74 Search a 2D Matrix Java Medium 2018.10.6 Array 2018.11.7
478 917 Reverse Only Letters Java Easy 2018.10.6 Two Pointer
479 918 Maxiumum Sum Circular Subarray Java Medium 2018.10.6 Array
480 919 Complete Binary Tree Inserter Java Medium 2018.10.6 Tree
481 494 Target Sum Java Medium 2018.10.7 Dynamic Programming, DFS 2018.10.15
482 523 Continuous Subarray Sum Java Medium 2018.10.7 Dynamic Programming, HashMap 2018.11.11
483 360 Sort Transformed Array Java Medium 2018.10.7 Two Pointers
484 129 Sum Root to Leaf Numbers Java Medium 2018.10.7 DFS 2018.11.18
485 498 Diagonal Traverse Java Medium 2018.10.8 Array 2018.10.22
486 314 Binary Tree Vertical Order Traversal Java Medium 2018.10.8 Tree, Hash Table 2018.10.15 2018.10.23 2018.11.11
487 785 Is Graph Bipartite Java Medium 2018.10.9 Graph, DFS, BFS 2018.10.27 2018.11.11
488 678 Valid Patrenthesis String Java Medium 2018.10.9 Greedy
489 73 Set Matrix Zeroes Java Medium 2018.10.9 Array
490 398 Random Pick Index Java Medium 2018.10.10 Reservoir Sampling 2018.11.12
491 209 Minimum Size Subarray Sum Java Medium 2018.10.10 Array, Two Pointers, Binary Search 2018.10.17 2018.10.23 2018.10.28 2018.11.15
492 688 Knight Probability in Chessboard Java Medium 2018.10.10 Dynamic Programming 2019.2.26 2019.3.7
493 524 Longest Word in Dictionary through Deleting Java Medium 2018.10.10 Two Pointers, Sort
494 304 Range Sum Query 2D - Immutble Java Medium 2018.10.10 Dynamic Programming
495 449 Serialize and Deserialize BST Java Medium 2018.10.11 Tree
496 426 Convert Binary Search Tree to Sorted Doubly Linked List Java Medium 2018.10.11 Tree 2018.10.23 2018.11.10
497 251 Flatten 2D Vector Java Medium 2018.10.11 Design 2018.11.12
498 395 Longest Substring with At Least K Repeating Characters Java Medium 2018.10.11 Recursion
499 416 Partition Equal Subset Sum Java Medium 2018.10.12 Dynamic Programming
500 90 Subsets II Java Medium 2018.10.13 Backtracking 2018.10.26
501 430 Flatten a Multilevel Doubly Linked List Java Medium 2018.10.14 LinkedList, DFS 2018.10.27
502 722 Remove Comments Java Medium 2018.10.14 String
503 662 Maximum Width of Binary Tree Java Medium 2018.10.15 Tree
504 230 Kth Smallest Element in a BST Java Medium 2018.10.18 Tree, Binary Search
505 925 Long Pressed Name Java Easy 2018.10.21 String
506 926 Flip String to Monotone Increasing Java Medium 2018.10.21 String
507 273 Integer to English Words Java Hard 2018.10.21 String 2018.11.17
508 301 Remove Invalid Parentheses Java Hard 2018.10.22 Backtracking
509 65 Valid Number Java Hard 2018.10.22 Math, String 2018.10.25
510 311 Sparse Matrix Multiplication Java Medium 2018.10.22 Hash Table
511 282 Expression Add Operators Java Hard 2018.10.22 DFS, BackTracking
512 99 Recover Binary Search Tree Java Hard 2018.10.24 DFS, Tree
513 428 Serialize and Deserialize N-ary Tree Java Hard 2018.10.24 Tree
514 305 Number of Islands II Java Hard 2018.10.26 Union Find
515 272 Closest Binary Search Tree Value II Java Hard 2018.10.26 Stack, Tree
516 128 Longest Consecutive Sequence Java Hard 2018.10.26 Union Find, Array
517 403 Frog Jump Java Hard 2018.10.26 Dynamic Programming
518 84 Largest Rectangle in Histogram Java Hard 2018.10.26 Stack 2019.2.17
519 216 Combination Sum III Java Medium 2018.10.27 Backtracking 2019.2.5 2019.2.24
520 377 Combination Sum IV Java Medium 2018.10.27 Dynamic Programming
521 269 Alien Dictionary Java Hard 2018.10.27 Topological Sort 2018.11.13
522 791 Custom Sort String Java Medium 2018.10.27 2018.11.12 Sort
523 239 Sliding Window Maximum Java Hard 2018.10.27 Queue
524 29 [Divide Two Integers][29] Java Medium 2018.10.27 Bit Manipulation 2018.11.8 2018.11.11
525 224 Basic Calculator Java Hard 2018.10.27 Stack, Math
526 295 Find Median from Data Stream Java Hard 2018.10.28 Heap 2019.4.21
527 380 Insert Delete GetRandom O(1) Java Medium 2018.10.28 Hash Map, Design
528 381 [Insert Delete GetRandom O(1) - - Duplicates Allowed][381] Java Hard 2018.10.28 Hash Map, LinkedHashSet, Design 2018.11.5
529 71 Simplify Path Java Medium 2018.10.28 String, Stack
530 286 Walls and Gates Java Medium 2018.10.28 BFS 2018.11.17 2019.2.27
531 348 [Design Tic-Tac-Toe][348] Java Medium 2018.10.28 Design 2019.3.3
532 708 Insert into a Cyclic Sorted List Java Medium 2018.10.28 LinkedList
533 261 Graph Valid Tree Java Medium 2018.10.30 Union Find 2019.3.1
534 221 Maximal Square Java Medium 2018.11.3 Stack, Dynamic Programming 2018.11.8 2019.2.18
535 154 Find Minimum in Rotated Sorted Array II Java Hard 2018.11.7 Binary Search
536 644 Maximum Average Subarray II Java Hard 2018.11.8 Binary Search
537 486 Predict the Winner Java Medium 2018.11.9 Dynamic Programming, Minimax
538 10 Regular Expression Matching Java Hard 2018.11.11 Dynamic Programming, Backtracking 2018.11.16 2019.3.8
539 43 Multiply Strings Java Medium 2018,11,11 String, Math
540 382 Linked List Random Node Java Medium 2018.11.12 Reservoir Sampling
541 678 Valid Parenthesis String Java Medium 2018.11.12 Stack
542 247 Strobogrammatic Number II Java Medium 2018.11.12 Recursion 2018.11.17
543 222 Count Complete Tree Nodes Java Medium 2018.11.14 Tree 2019.2.17
544 307 Range Sum Query - Mutable Java Medium 2018.11.15 Binary Indexed Tree
545 689 Maximum Sum of 3 Non-Overlapping Subarrays Java Hard 2018.11.16 Array, Dynamic Programming
546 8 String to Integer (atoi) Java Medium 2018.11.16 Math, String
547 317 Shortest Distance from All Buildings Java Hard 2018.11.16 BFS
548 336 Palindrome Pairs Java Hard 2018.11.16 Trie
549 55 Jump Game Java Medium 2018.11.16 Dynamic Programming, Greedy 2019.1.16
550 57 Insert Interval Java Hard 2018.11.16 Array
551 32 Longest Valid Parentheses Java Hard 2018.11.16 Dynamic Programming
552 567 Permutation in String Java Medium 2018.11.16 Sliding Window
553 117 Populating Next Right Pointers in Each Node II Java Medium 2018.11.16 Tree
554 636 Exclusive Time of Functions Java Medium 2018.11.16 Stack
555 44 Wildcard Matching Java Hard 2018.11.16 Dynamic Programming 2019.3.8
556 452 Minimum Number of Arrows to Burst Balloons Java Medium 2018.11.17 Greedy
557 329 Longest Increasing Path in a Matrix Java Hard 2018.11.17 DFS, Memorization 2019.2.17
558 291 Word Pattern II Java Hard 2018.11.17 Backtracking
559 140 Word Break II Java Hard 2018.11.17 Dynamic Programming, Backtracking
560 158 Read N Characters Given Read4 II Java Hard 2018.11.17 String 2019.2.17 2019.3.2
561 862 Shortest Subarray with Sum at Least K Java Hard 2018.11.17 Deque
562 493 Reverse Pairs Java Hard 2018.11.17 Divide and Conquer
563 99
564 554 Brick Wall Java Medium 2018.11.17 HashMap
565 248 Strobogrammatic Number III Java Hard 2018.11.17 Recuision
566 622 Design Circular Queue Java Medium 2018.11.17 Design
567 332 Reconstruct Itinerary Java Medium 2018.11.17 HashMap, DFS
568 921 Minimum Add to Make Parentheses Valid Java Medium 2018.11.26 Stack, Greedy
569 933 Number of Recent Calls Java Easy 2018.11.26 Queue
570 929 Unique Email Addresses Java Easy 2018.11.26 String 2019.1.14
571 930 Binary Subarrays With Sum Java Medium 2018.11.26 Hash Table, Two Pointers
572 815 Bus Routes Java Hard 2018.11.30 BFS
573 390 Elimination Game Java Medium 2018.12.1 Math
574 949 Largest Time for Given Digits Java Easy 2018.12.1 Math, DFS
575 950 Reveal Cards in Increasing Order Java Medium 2018.12.1 Array, Deque
576 951 Flip Equivalent Binary Trees Java Medium 2018.12.1 Tree 2019.2.27
577 953 Verifying an Alien Dictionary Java Easy 2018.12.16 Hash Table
578 954 Array of Doubled Pairs Java Medium 2018.12.17 Hash Table
579 955 Delete Columns to Make Sorted II Java Medium 2018.12.18 Greedy
580 957 Prison Cells After N Days Java Medium 2018.12.19 Hash Table
581 959 Regions Cut By Slashes Java Medium 2018.12.21 Union Find
582 958 Check Completeness of a Binary Tree Java Medium 2018.12.22 Tree
583 965 Univalued Binary Tree Java Easy 2019.1.5 Tree
584 966 Vowel Spellchecker Java Medium 2019.1.6 Hash Table, String
585 970 Powerful Integers Java Easy 2019.1.7 Math
586 967 Numbers with same consecutive differences Java Medium 2019.1.8 Dynamic Programming
587 968 Pancake Sorting Java Medium 2019.1.8 Array, Sort
588 971 Flip Binary Tree to Match Preorder Traversal Java Medium 2019.1.8 DFS
589 402 Remove K Digits Java Medium 2019.1.9 Stack, Greedy 2019.2.10
590 223 Rectangle Area Java Medium 2019.1.9 Math
591 309 Best Time To Buy and Sell Stock with Cooldown Java Medium 2019.1.9 Dynamic Programming
592 713 Subarray Product Less Than K Java Medium 2019.1.10 Two Pointers
593 931 Minimum Falling Path Sum Java Medium 2019.1.11 Dynamic Programming
594 932 Beautiful Array Java Medium 2019.1.11 Divide and Conquer
595 819 Most Common Word Java Easy 2019.1.12 String
596 683 K Empty Slots Java Hard 2019.1.16 HashTable
597 743 Network Delay Time Java Easy 2019.1.17 Graph 2019.2.28
598 787 Cheapest Flight Within K Stops Java Medium 2019.1.18 Graph
599 131 Palindrome Partitioning Java Medium 2019.1.18 Backtracking
600 279 Perfect Square Java Medium 2019.1.18 Dynamic Programming
601 384 Shuffle an Array Java Medium 2019.1.18 Design
602 977 Squares of a Sorted Array Java Easy 2019.1.20 Two Pointers, Sort 2019.3.1
603 978 Longest Turbulent Subarray Java Medium 2019.1.26 Two Pointers
604 265 Paint House II Java Hard 2019.1.27 Dynamic Programming
605 188 Best Time to Buy and Sell Stock IV Java Hard 2019.1.28 Dynamic Programming
606 982 Triples with Bitwise AND Equal To Zero Java Hard 2019.1.28 Dynamic Programming
607 979 Distribute Coins in Binary Tree Java Medium 2019.1.28 DFS
608 984 String Without AAA or BBB Java Easy 2019.2.2 Greedy
609 985 Sum of Even Numbers After Queries Java Easy 2019.2.3 Array
610 835 Image Overlap Java Medium 2019.2.5 Array
611 132 Palindrome Partitioning II Java Hard 2019.2.5 Dynamic Programming
612 399 Evaluate Division Java Medium 2019.2.6 Union Find, BFS
613 299 Bulls and Cows Java Medium 2019.2.6 Hash Table 2019.2.12 2019.3.2
614 87 Scramble String Java Hard 2019.2.9 Dynamic Programming
615 312 Burst Balloons Java Hard 2019.2.9 Dynamic Programming
616 980 Unique Paths III Java Hard 2019.2.10 Backtracking
617 228 Summary Ranges Java Medium 2019.2.10 Two Pointers
618 701 Insert Into a Binary Search Tree Java Medium 2019.2.11 Tree
619 723 Candy Crush Java Medium 2019.2.11 Two Pointers
620 702 Search in a Sorted Array of Unknown Size Java Medium 2019.2.11 Binary Search
621 776 Split BST Java Medium 2019.2.11 BST
622 684 Redundant Connection Java Medium 2019.2.11 Union Find
623 320 Generalized Abbreviation Java Medium 2019.2.11 Backtracking
624 249 Group Shifted Strings Java Medium 2019.2.11 HashTable
625 386 Lexicographical Numbers Java Medium 2019.2.11 DFS
626 549 Binary Tree Longest Consecutive Sequence II Java Medium 2019.2.11 Tree
627 424 Longest Repeating Character Replacement Java Medium 2019.2.11 Two Pointers, Sliding Window 2019.2.25
628 135 Candy Java Hard 2019.2.12 Greedy 2019.2.17 2019.2.27
629 591 Tag Validator Java Hard 2019.2.12 Stack
630 562 Longest Line of Consecutive One in Matrix Java Medium 2019.2.13 Dynamic Programming
631 737 Sentence Similarity II Java Medium 2019.2.13 Union Find
632 640 Solve the Equation Java Medium 2019.2.13 Math, Stack
633 659 Split Array into Consecutive Subsequences Java Medium 2019.2.13 Heap, Greedy
634 334 Increasing Triplet Subsequence Java Medium 2019.2.13 Array
635 450 Delete Node in a BST Java Medium 2019.2.13 Tree
636 284 Peeking Iterator Java Medium 2019.2.13 Design
637 616 Add Bold Tag in String Java Medium 2019.2.13 String
638 388 Longest Absolute File Path Java Medium 2019.2.14 String
639 935 Knight Dialer Java Medium 2019.2.14 Dynamic Programming
640 433 Minimum Genetic Mutation Java Medium 2019.2.14 BFS
641 375 Guess Number Higher or Lower II Java Medium 2019.2.14 Dynamic Programming 2019.2.25
642 417 Pacific Atlantic Water Flow Java Medium 2019.2.14 BFS, DFS
643 115 Distinct Subsequences Java Medium 2019.2.14 Dynamic Programming
644 288 Unique Word Abbreviation Java Medium 2019.2.15 Hash Table
645 457 Circular Array Loop Java Medium 2019.2.15 Two Pointers
646 777 [Swap Adjacent in LR String][777] Java Medium 2019.2.15 Two Pointers 2019.2.18
647 418 Sentence Screen Fitting Java Medium 2019.2.15 Two Pointers
648 333 Largest BST Subtree Java Medium 2019.2.15 Tree
649 187 Repeated DNA Sequences Java Medium 2019.2.15 HashTable 2019.2.26
650 753 Cracking the Safe Java Hard 2019.2.16 DFS 2019.2.18
651 857 Minimum Cost to Hire K Workers Java Hard 2019.2.16 Heap
652 639 Decode Ways II Java Hard 2019.2.17 Dynamic Programming
653 843 Guess the word Java Hard 2019.2.17 Minimax
654 774 Minimize Max Distance to Gas Station Java Hard 2019.2.17 Dynamic Programming, Heap, Binary Search
655 818 Race Car Java Hard 2019.2.17 BFS, Dynamic Programming
656 489 Robot Room Cleaner Java Hard 2019.2.18 DFS
657 939 Minimum Area Rectangle Java Medium 2019.2.18 HashTable
658 833 Find And Replace in String Java Medium 2019.2.18 HashTable
659 410 [Split Array Largest Sum][410] Java Hard 2019.2.18 Dynamic Programming 2019.2.26
660 694 Number of Distinct Islands Java Medium 2019.2.18 DFS
661 85 Maximal Rectangle Java Hard 2019.2.18 Stack
662 212 Word Search II Java Hard 2019.2.20 Trie, DFS
663 60 Permutation Sequence Java Medium 2019.2.20 Math
664 37 Sudoku Solver Java Hard 2019.2.21 Backtracking
665 41 First Missing Positive Java Hard 2019.2.21 Array 2019.3.6
666 527 Word Abbreviation Java Hard 2019.2.22 Trie, HashTable
667 77 Combinations Java Medium 2019.2.22 Backtracking
668 316 Remove Duplicate Letters Java Hard 2019.2.23 Stack
669 548 Split Array With Equal Sum Java Medium 2019.2.25 Array
670 834 Sum of Distances in Tree Java Hard 2019.2.25 Tree, DFS
671 997 Find the Town Judge Java Easy 2019.2.27 Graph
672 685 Redundant Connection II Java Hard 2019.3.1 Graph
673 803 Bricks Falling When Hit Java Hard 2019.3.1 Union Find
674 837 New 21 Game Java Medium 2019.3.1 Dynamic Programming
675 593 Valid Square Java Medium 2019.3.2 Math
676 150 Evaluate Reverse Polish Notation Java Medium 2019.3.3 Stack
677 794 Valid Tic-Tac-Toe State Java Medium 2019.3.3 Array
678 1000 Minimum Cost to Merge Stones Java Hard 2019.3.3 Dynamic Programming
679 1004 Max Consecutive Ones III Java Medium 2019.3.3 Sliding Window, Two Pointers
680 487 Max Consecutive Ones II Java Medium 2019.3.3 Sliding Window, Two Pointers
681 797 All Paths From Source to Target Java Medium 2019.3.5 Graph
682 632 Smallest Range Java Hard 2019.3.5 Heap
683 947 Most Stones Removed with Same Row or Column Java Medium 2019.3.6 Union Find
684 765 Couples Holding Hands Java Hard 2019.3.6 Union Find
685 854 K-Similar Strings Java Hard 2019.3.6 BFS, Backtracking
686 509 Finbonacci Number Java Easy 2019.3.12 Dynamic Programming
687 310 Minimum Height Trees Java Medium 2019.3.13 BFS, Graph
688 547 Friend Circles Java Medium 2019.3.13 Union Find
689 611 Valid Triangle Number Java Medium 2019.3.13 Array
690 475 Heaters Java Easy 2019.3.13 Binary Search
691 706 Design HashMap Java Easy 2019.3.13 Design
692 705 Design HashSet Java Easy 2019.3.13 Design
693 707 Design Linked List Java Easy 2019.3.15 Design
694 655 Print Binary Tree Java Medium 2019.3.15 Tree
695 362 Design Hit Counter Java Medium 2019.3.15 Design
696 788 Rotated Digits Java Easy 2019.3.19 Dynamic Programming
697 289 Game of Life Java Medium 2019.3.20 Array
698 93 Restore IP Addresses Java Medium 2019.3.22 Backtracking
699 89 Gray Code Java Medium 2019.3.23 Backtracking
700 156 Binary Tree Upside Down Java Medium 2019.3.23 Tree
701 274 H-Index Java Medium 2019.3.24 Sort, HashTable, Binary Search
702 275 H-Index II Java Medium 2019.3.25 Binary Search
703 539 Minimum Time Difference Java Medium 2019.3.25 Sort
704 130 Surrounded Regions Java Medium 2019.3.26 Union Find
705 163 Missing Ranges Java Medium 2019.3.26 Array
706 166 Fraction to Recurring Decimal Java Medium 2019.3.27 Hash Table
707 201 Bitwise AND of Numbers Range Java Medium 2019.3.28 Bit Manipulation
708 536 Construct Binary Tree from String Java Medium 2019.3.28 Tree
709 319 Bulb Switcher Java Medium 2019.3.30 Math
710 718 Maximum Length of Repeated Subarray Java Medium 2019.3.31 Dynamic Programming
711 542 01 Matrix Java Medium 2019.4.1 BFS
712 670 Maximum Swap Java Medium 2019.4.2 Array
713 646 Maximum Length of Pair Chain Java Medium 2019.4.3 Dynamic Programming, Greedy
714 1017 Convert to Base -2 Java Medium 2019.4.4 Math
715 1018 Binary Prefix Divisible By 5 Java Easy 2019.4.4 Array
716 1019 Next Greater Node In Linked List Java Medium 2019.4.4 Stack
717 1020 Number of Enclaves Java Medium 2019.4.4 Union Find
718 510 Inorder Successor in BST II Java Medium 2019.4.8 Tree
719 365 Water and Jug Problem Java Medium 2019.4.9 Math
720 368 Largest Divisible Subset Java Medium 2019.4.9 Dynamic Programming
721 343 Integer Break Java Medium 2019.4.9 Dynamic Programming
722 373 Find K Pairs with Smallest Sums Java Medium 2019.4.10 Heap
723 480 Sliding Window Median Java Hard 2019.4.13 Heap
724 652 Find Duplicate Subtrees Java Medium 2019.4.13 HashTable
725 1022 Sum of Root To Leaf Binary Numbers Java Easy 2019.4.14 DFS
726 164 Maximum Gap Java Hard 2019.4.15 Bucket Sort
727 460 LFU Cache Java Hard 2019.4.17 HashTable, Design
728 529 Minuesweeper Java Medium 2019.4.17 BFS
729 934 Shortest Bridge Java Medium 2019.4.17 DFS, BFS
730 895 Maximum Frequency Stack Java Hard 2019.4.21 Stack
731 45 Jump Game II Java Hard 2019.5.5 Greedy
732 924 Minimize Malware Spread Java Hard 2019.5.7 Union Find
733 609 Find Duplicate File in System Java Medium 2019.5.9 HashMap
734 1029 Two City Scheduling Java Easy 2019.5.14 Greedy
735 1030 Matrix Cells in Distance Order Java Easy 2019.5.14 BFS
736 1031 Maximum Sum of Two Non-Overlapping Subarrays Java Medium 2019.5.17 Dynamic Programming
737 1033 Moving Stones Until Consecutive Java Easy 2019.5.28 Array
738 1078 Occurences After Bigram Java Easy 2019.6.12 String
739 1079 Letter Tile Possiblities Java Medium 2019.6.13 Backtracking
740 1080 Insufficient Nodes in Root to Leaf Paths Java Medium 2019.6.13 DFS
741 1081 Smallest Subsequence of Distinct Characters Java Medium 2019.6.13 Stack
742 1085 Sum of Digits in the Minimum Number Java Easy 2019.6.15 Array
743 1086 High Five Java Easy 2019.6.15 Hash Table
744 1087 Brace Expansion Java Medium 2019.6.16 BFS, Backtracking
745 1089 Duplicate Zeros Java Easy 2019.6.17 Array
746 1071 Greatest Common Divisor of Strings Java Easy 2019.6.18 String
747 1064 Fixed Point Java Easy 2019.6.20 Binary Search
748 1090 Largest Values From Labels Java Medium 2019.7.12 Greedy, HashTable
749 1099 Two Sum Less Than K Java Easy 2019.7.12 Array
750 1119 Remove Vowels from A String Java Easy 2019.7.26 String
751 1134 Armstrong Number Java Easy 2019.7.29 Math
752 1133 Largest Number Java Easy 2019.7.29 Hash Table
753 1135 Connecting Cities with Minimum Cost Java Medium 2019.7.30 Graph
754 1114 Print in Order Java Easy 2019.8.2 Thread
755 1143 Longest Common Subsequence Java Medium 2019.8.2 Dynamic Programming
756 1137 N-th Tribonacci Number Java Easy 2019.8.3 Recursion
757 1138 Alphabet Board Path Java Medium 2019.8.3 HashTable
758 1155 Number of Dice Rolls with Target Sum Java Medium 2019.8.13 Dynamic Programming
759 1154 Day of the Year Java Easy 2019.8.14 String
760 1156 Swap for Longest Repeated Character Substring Java Medium 2019.8.14 Two Pointers
761 1150 Check if a number is Majority Element in a Sorted Array Java Easy 2019.8.14 Binary Search
762 1175 Prime Arrangements Java Easy 2019.9.6 Math
763 1176 Diet Plan Performance Java Easy 2019.9.6 Two Pointers
764 1177 Can Make Palindrome from Substring Java Medium 2019.9.6 String
765 1171 Remove Zero Sum Consecutive Nodes from Linked List Java Medium 2019.9.17 Linked List
766 1170 Compare Strings by Frequency of the Smallest Character Java Easy 2019.9.17 String
767 1169 Invalid Transactions Java Medium 2019.9.18 HashTable
768 1167 Minimum Cost to Connect Sticks Java Medium 2019.9.18 Greedy
769 1165 Single-Row Keyboard Java Easy 2019.9.18 String
770 1162 As Far from Land as Possible Java Medium 2019.9.20 BFS
771 1180 Count Substrings with Only One Distinct Letter Java Easy 2019.10.6 Two Pointers
772 1181 Before and After Puzzle Java Medium 2019.10.7 HashMap
773 1182 Shortest Distance to Target Color Java Medium 2019.10.8 Binary Search
774 1184 Distance Between Bus Stops Java Easy 2019.10.9 Array
775 1185 Day of the Week Java Easy 2019.10.12 Array
776 1189 Maximum Number of Balloons Java Easy 2019.10.13 Array
777 1221 Split a String in Balanced Strings Java Easy 2019.10.16 Greedy
778 1219 Path with Maximum Gold Java Medium 2019.10.17 Backtracking
779 1243 Array Transformation Java Easy 2019.11.2 Array
780 1258 Synonymous Sentences Java Medium 2019.11.16 UnionFind, HashMap
781 1260 Shift 2D Grid Java Easy 2019.11.17 Array
782 1261 Find Elements in a Contaminated Binary Tree Java Medium 2019.11.20 DFS
783 1265 Print Immutable Linked List in Reverse Java Medium 2019.11.24 LinkedList
784 1266 Minimum Time Visiting All Points Java Easy 2019.11.30 Array
785 1267 Count Servers that Communicate Java Medium 2019.12.1 Graph
786 1268 Search Suggestions System Java Medium 2019.12.1 String
787 1271 Hexspeak Java Easy 2019.12.8 String
788 1272 Remove Interval Java Medium 2019.12.14 Array
789 1342 Number of Steps to Reduce a Number to Zero Java Easy 2020.2.10 Bit Manipulation
790 1347 Minimum Number of Steps to Make Two Strings Anagram Java Medium 2020.2.11 String
791 1346 Check If N and Its Double Exist Java Easy 2020.2.12 Array
792 1374 Generate a String With Characters That Have Odd Counts Java Easy 2020.3.8 String
793 1380 Lucky Numbers in a Matrix Java Easy 2020.3.15 Array
794 1381 Design a Stack With Increment Operation Java Medium 2020.3.15 Stack
795 1382 Balance a Binary Search Tree Java Medium 2020.3.16 Tree

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