Swift |
460 |
LFU Cache |
Hard |
Swift |
448 |
Find All Numbers Disappeared in an Array |
Easy |
Swift |
377 |
Combination Sum IV |
Medium |
|
376 |
Wiggle Subsequence |
Medium |
Swift |
375 |
Guess Number Higher or Lower II |
Medium |
|
374 |
Guess Number Higher or Lower |
Easy |
|
373 |
Find K Pairs with Smallest Sums |
Medium |
Swift |
372 |
Super Pow |
Medium |
Swift |
371 |
Sum of Two Integers |
Easy |
|
370 |
Range Addition ♥ |
Medium |
|
369 |
Plus One Linked List ♥ |
Medium |
|
368 |
Largest Divisible Subset |
Medium |
|
367 |
Valid Perfect Square |
Medium |
|
366 |
Find Leaves of Binary Tree ♥ |
Medium |
|
365 |
Water and Jug Problem |
Medium |
Swift |
364 |
Nested List Weight Sum II ♥ |
Medium |
|
363 |
Max Sum of Rectangle No Larger Than K |
Hard |
|
362 |
Design Hit Counter ♥ |
Medium |
|
361 |
Bomb Enemy ♥ |
Medium |
Swift |
360 |
Sort Transformed Array ♥ |
Medium |
|
359 |
Logger Rate Limiter ♥ |
Easy |
|
358 |
Rearrange String k Distance Apart ♥ |
Hard |
|
357 |
Count Numbers with Unique Digits |
Medium |
|
356 |
Line Reflection ♥ |
Medium |
|
355 |
Design Twitter |
Medium |
|
354 |
Russian Doll Envelopes |
Hard |
|
353 |
Design Snake Game ♥ |
Medium |
|
352 |
Data Stream as Disjoint Intervals |
Hard |
|
351 |
Android Unlock Patterns ♥ |
Medium |
Swift |
350 |
Intersection of Two Arrays II |
Easy |
Swift |
349 |
Intersection of Two Arrays |
Easy |
|
348 |
Design Tic-Tac-Toe ♥ |
Medium |
Swift |
347 |
Top K Frequent Elements |
Medium |
|
346 |
Moving Average from Data Stream ♥ |
Easy |
Swift |
345 |
Reverse Vowels of a String |
Easy |
Swift |
344 |
Reverse String |
Easy |
Swift |
343 |
Integer Break |
Medium |
|
342 |
Power of Four |
Easy |
Swift |
341 |
Flatten Nested List Iterator |
Medium |
Swift |
340 |
Longest Substring with At Most K Distinct Characters ♥ |
Hard |
Swift |
339 |
Nested List Weight Sum ♥ |
Easy |
Swift |
338 |
Counting Bits |
Medium |
Swift |
337 |
House Robber III |
Medium |
|
336 |
Palindrome Pairs |
Hard |
|
335 |
Self Crossing |
Hard |
Swift |
334 |
Increasing Triplet Subsequence |
Medium |
|
333 |
Largest BST Subtree ♥ |
Medium |
|
332 |
Reconstruct Itinerary |
Medium |
|
331 |
Verify Preorder Serialization of a Binary Tree |
Medium |
|
330 |
Patching Array |
Hard |
|
329 |
Longest Increasing Path in a Matrix |
Hard |
Swift |
328 |
Odd Even Linked List |
Medium |
|
327 |
Count of Range Sum |
Hard |
Swift |
326 |
Power of Three |
Easy |
Swift |
325 |
Maximum Size Subarray Sum Equals k ♥ |
Medium |
Swift |
324 |
Wiggle Sort II |
Medium |
Swift |
323 |
Number of Connected Components in an Undirected Graph ♥ |
Medium |
Swift |
322 |
Coin Change |
Medium |
Swift |
321 |
Create Maximum Number |
Hard |
Swift |
320 |
Generalized Abbreviation ♥ |
Medium |
|
319 |
Bulb Switcher |
Medium |
|
318 |
Maximum Product of Word Lengths |
Medium |
Swift |
317 |
Shortest Distance from All Buildings ♥ |
Hard |
|
316 |
Remove Duplicate Letters |
Hard |
|
315 |
Count of Smaller Numbers After Self |
Hard |
Swift |
314 |
Binary Tree Vertical Order Traversal ♥ |
Medium |
Swift |
313 |
Super Ugly Number |
Medium |
Swift |
312 |
Burst Balloons |
Hard |
Swift |
311 |
Sparse Matrix Multiplication ♥ |
Medium |
|
310 |
Minimum Height Trees |
Medium |
Swift |
309 |
Best Time to Buy and Sell Stock with Cooldown |
Medium |
|
308 |
Range Sum Query 2D - Mutable ♥ |
Hard |
|
307 |
Range Sum Query - Mutable |
Medium |
|
306 |
Additive Number |
Medium |
Swift |
305 |
Number of Islands II ♥ |
Hard |
Swift |
304 |
Range Sum Query 2D - Immutable |
Medium |
|
303 |
Range Sum Query - Immutable |
Easy |
|
302 |
Smallest Rectangle Enclosing Black Pixels ♥ |
Hard |
Swift |
301 |
Remove Invalid Parentheses |
Hard |
Swift |
300 |
Longest Increasing Subsequence |
Medium |
|
299 |
Bulls and Cows |
Easy |
|
298 |
Binary Tree Longest Consecutive Sequence ♥ |
Medium |
|
297 |
Serialize and Deserialize Binary Tree |
Hard |
Swift |
296 |
Best Meeting Point ♥ |
Hard |
|
295 |
Find Median from Data Stream |
Hard |
Swift |
294 |
Flip Game II ♥ |
Medium |
Swift |
293 |
Flip Game ♥ |
Easy |
|
292 |
Nim Game |
Easy |
|
291 |
Word Pattern II ♥ |
Hard |
Swift |
290 |
Word Pattern |
Easy |
Swift |
289 |
Game of Life |
Medium |
|
288 |
Unique Word Abbreviation ♥ |
Easy |
|
287 |
Find the Duplicate Number |
Hard |
Swift |
286 |
Walls and Gates ♥ |
Medium |
|
285 |
Inorder Successor in BST ♥ |
Medium |
|
284 |
Peeking Iterator |
Medium |
Swift |
283 |
Move Zeroes |
Easy |
Swift |
282 |
Expression Add Operators |
Hard |
|
281 |
Zigzag Iterator ♥ |
Medium |
Swift |
280 |
Wiggle Sort ♥ |
Medium |
Swift |
279 |
Perfect Squares |
Medium |
|
278 |
First Bad Version |
Easy |
|
277 |
Find the Celebrity ♥ |
Medium |
Swift |
276 |
Paint Fence ♥ |
Easy |
|
275 |
H-Index II |
Medium |
|
274 |
H-Index |
Medium |
Swift |
273 |
Integer to English Words |
Hard |
Swift |
272 |
Closest Binary Search Tree Value II ♥ |
Hard |
|
271 |
Encode and Decode Strings ♥ |
Medium |
Swift |
270 |
Closest Binary Search Tree Value ♥ |
Easy |
Swift |
269 |
Alien Dictionary ♥ |
Hard |
Swift |
268 |
Missing Number |
Easy |
|
267 |
Palindrome Permutation II ♥ |
Medium |
Swift |
266 |
Palindrome Permutation ♥ |
Easy |
Swift |
265 |
Paint House II ♥ |
Hard |
Swift |
264 |
Ugly Number II |
Medium |
Swift |
263 |
Ugly Number |
Easy |
Swift |
261 |
Graph Valid Tree ♥ |
Medium |
|
260 |
Single Number III |
Medium |
|
259 |
3Sum Smaller ♥ |
Medium |
Swift |
258 |
Add Digits |
Easy |
Swift |
257 |
Binary Tree Paths |
Easy |
Swift |
256 |
Paint House ♥ |
Medium |
|
255 |
Verify Preorder Sequence in Binary Search Tree ♥ |
Medium |
Swift |
254 |
Factor Combinations ♥ |
Medium |
Swift |
253 |
Meeting Rooms II ♥ |
Medium |
Swift |
252 |
Meeting Rooms ♥ |
Easy |
Swift |
251 |
Flatten 2D Vector ♥ |
Medium |
|
250 |
Count Univalue Subtrees ♥ |
Medium |
|
249 |
Group Shifted Strings ♥ |
Easy |
|
248 |
Strobogrammatic Number III ♥ |
Hard |
Swift |
247 |
Strobogrammatic Number II ♥ |
Medium |
Swift |
246 |
Strobogrammatic Number ♥ |
Easy |
Swift |
245 |
Shortest Word Distance III ♥ |
Medium |
Swift |
244 |
Shortest Word Distance II ♥ |
Medium |
Swift |
243 |
Shortest Word Distance ♥ |
Easy |
Swift |
242 |
Valid Anagram |
Easy |
Swift |
241 |
Different Ways to Add Parentheses |
Medium |
Swift |
240 |
Search a 2D Matrix II |
Medium |
Swift |
239 |
Sliding Window Maximum |
Hard |
Swift |
238 |
Product of Array Except Self |
Medium |
|
237 |
Delete Node in a Linked List |
Easy |
|
236 |
Lowest Common Ancestor of a Binary Tree |
Medium |
Swift |
235 |
Lowest Common Ancestor of a Binary Search Tree |
Easy |
Swift |
234 |
Palindrome Linked List |
Easy |
|
233 |
Number of Digit One |
Hard |
Swift |
232 |
Implement Queue using Stacks |
Easy |
Swift |
231 |
Power of Two |
Easy |
Swift |
230 |
Kth Smallest Element in a BST |
Medium |
Swift |
229 |
Majority Element II |
Medium |
Swift |
228 |
Summary Ranges |
Medium |
|
227 |
Basic Calculator II |
Medium |
Swift |
226 |
Invert Binary Tree |
Easy |
|
225 |
Implement Stack using Queues |
Easy |
Swift |
224 |
Basic Calculator |
Hard |
Swift |
223 |
Rectangle Area |
Easy |
|
222 |
Count Complete Tree Nodes |
Medium |
Swift |
221 |
Maximal Square |
Medium |
|
220 |
Contains Duplicate III |
Medium |
Swift |
219 |
Contains Duplicate II |
Easy |
|
218 |
The Skyline Problem |
Hard |
Swift |
217 |
Contains Duplicate |
Easy |
Swift |
216 |
Combination Sum III |
Medium |
Swift |
215 |
Kth Largest Element in an Array |
Medium |
|
214 |
Shortest Palindrome |
Hard |
Swift |
213 |
House Robber II |
Medium |
Swift |
212 |
Word Search II |
Hard |
Swift |
211 |
Add and Search Word - Data structure design |
Medium |
Swift |
210 |
Course Schedule II |
Medium |
Swift |
209 |
Minimum Size Subarray Sum |
Medium |
Swift |
208 |
Implement Trie (Prefix Tree) |
Medium |
Swift |
207 |
Course Schedule |
Medium |
Swift |
206 |
Reverse Linked List |
Easy |
Swift |
205 |
Isomorphic Strings |
Easy |
Swift |
204 |
Count Primes |
Easy |
Swift |
203 |
Remove Linked List Elements |
Easy |
Swift |
202 |
Happy Number |
Easy |
|
201 |
Bitwise AND of Numbers Range |
Medium |
Swift |
200 |
Number of Islands |
Medium |
Swift |
199 |
Binary Tree Right Side View |
Medium |
Swift |
198 |
House Robber |
Easy |
|
191 |
Number of 1 Bits |
Easy |
|
190 |
Reverse Bits |
Easy |
Swift |
189 |
Rotate Array |
Easy |
Swift |
188 |
Best Time to Buy and Sell Stock IV |
Hard |
|
187 |
Repeated DNA Sequences |
Medium |
Swift |
186 |
Reverse Words in a String II ♥ |
Medium |
Swift |
179 |
Largest Number |
Medium |
|
174 |
Dungeon Game |
Hard |
Swift |
173 |
Binary Search Tree Iterator |
Medium |
Swift |
172 |
Factorial Trailing Zeroes |
Easy |
Swift |
171 |
Excel Sheet Column Number |
Easy |
Swift |
170 |
Two Sum III - Data structure design ♥ |
Easy |
Swift |
169 |
Majority Element |
Easy |
|
168 |
Excel Sheet Column Title |
Easy |
Swift |
167 |
Two Sum II - Input array is sorted ♥ |
Medium |
Swift |
166 |
Fraction to Recurring Decimal |
Medium |
|
165 |
Compare Version Numbers |
Easy |
|
164 |
Maximum Gap |
Hard |
Swift |
163 |
Missing Ranges ♥ |
Medium |
Swift |
162 |
Find Peak Element |
Medium |
Swift |
161 |
One Edit Distance♥ |
Medium |
|
160 |
Intersection of Two Linked Lists |
Easy |
Swift |
159 |
Longest Substring with At Most Two Distinct Characters ♥ |
Hard |
|
158 |
Read N Characters Given Read4 II - Call multiple times ♥ |
Hard |
|
157 |
Read N Characters Given Read4 ♥ |
Easy |
Swift |
156 |
Binary Tree Upside Down ♥ |
Medium |
Swift |
155 |
Min Stack |
Easy |
Swift |
154 |
Find Minimum in Rotated Sorted Array II |
Hard |
Swift |
153 |
Find Minimum in Rotated Sorted Array |
Medium |
Swift |
152 |
Maximum Product Subarray |
Medium |
Swift |
151 |
Reverse Words in a String |
Medium |
Swift |
150 |
Evaluate Reverse Polish Notation |
Medium |
|
149 |
Max Points on a Line |
Hard |
|
148 |
Sort List |
Medium |
|
147 |
Insertion Sort List |
Medium |
Swift |
146 |
LRU Cache |
Hard |
Swift |
145 |
Binary Tree Postorder Traversal |
Hard |
Swift |
144 |
Binary Tree Preorder Traversal |
Medium |
Swift |
143 |
Reorder List |
Medium |
|
142 |
Linked List Cycle II |
Medium |
|
141 |
Linked List Cycle |
Easy |
|
140 |
Word Break II |
Hard |
|
139 |
Word Break |
Medium |
|
138 |
Copy List with Random Pointer |
Hard |
Swift |
137 |
Single Number II |
Medium |
Swift |
136 |
Single Number |
Medium |
|
135 |
Candy |
Hard |
Swift |
134 |
Gas Station |
Medium |
|
133 |
Clone Graph |
Medium |
|
132 |
Palindrome Partitioning II |
Hard |
Swift |
131 |
Palindrome Partitioning |
Medium |
|
130 |
Surrounded Regions |
Medium |
|
129 |
Sum Root to Leaf Numbers |
Medium |
Swift |
128 |
Longest Consecutive Sequence |
Hard |
Swift |
127 |
Word Ladder |
Medium |
|
126 |
Word Ladder II |
Hard |
Swift |
125 |
Valid Palindrome |
Easy |
Swift |
124 |
Binary Tree Maximum Path Sum |
Hard |
Swift |
123 |
Best Time to Buy and Sell Stock III |
Hard |
Swift |
122 |
Best Time to Buy and Sell Stock II |
Medium |
Swift |
121 |
Best Time to Buy and Sell Stock |
Easy |
Swift |
120 |
Triangle |
Medium |
|
119 |
Pascal’s Triangle II |
Easy |
|
118 |
Pascal’s Triangle |
Easy |
|
117 |
Populating Next Right Pointers in Each Node II |
Hard |
|
116 |
Populating Next Right Pointers in Each Node |
Medium |
|
115 |
Distinct Subsequences |
Hard |
Swift |
114 |
Flatten Binary Tree to Linked List |
Medium |
Swift |
113 |
Path Sum II |
Medium |
Swift |
112 |
Path Sum |
Easy |
Swift |
111 |
Minimum Depth of Binary Tree |
Easy |
Swift |
110 |
Balanced Binary Tree |
Easy |
|
109 |
Convert Sorted List to Binary Search Tree |
Medium |
Swift |
108 |
Convert Sorted Array to Binary Search Tree |
Medium |
Swift |
107 |
Binary Tree Level Order Traversal II |
Easy |
Swift |
106 |
Construct Binary Tree from Inorder and Postorder Traversal |
Medium |
Swift |
105 |
Construct Binary Tree from Preorder and Inorder Traversal |
Medium |
Swift |
104 |
Maximum Depth of Binary Tree |
Easy |
Swift |
103 |
Binary Tree Zigzag Level Order Traversal |
Medium |
Swift |
102 |
Binary Tree Level Order Traversal |
Easy |
Swift |
101 |
Symmetric Tree |
Easy |
Swift |
100 |
Same Tree |
Easy |
Swift |
99 |
Recover Binary Search Tree |
Hard |
Swift |
98 |
Validate Binary Search Tree |
Medium |
|
97 |
Interleaving String |
Hard |
Swift |
96 |
Unique Binary Search Trees |
Medium |
|
95 |
Unique Binary Search Trees II |
Medium |
Swift |
94 |
Binary Tree Inorder Traversal |
Medium |
|
93 |
Restore IP Addresses |
Medium |
|
92 |
Reverse Linked List II |
Medium |
Swift |
91 |
Decode Ways |
Medium |
Swift |
90 |
Subsets II |
Medium |
Swift |
89 |
Gray Code |
Medium |
Swift |
88 |
Merge Sorted Array |
Easy |
|
87 |
Scramble String |
Hard |
Swift |
86 |
Partition List |
Medium |
|
85 |
Maximal Rectangle |
Hard |
|
84 |
Largest Rectangle in Histogram |
Hard |
Swift |
83 |
Remove Duplicates from Sorted List |
Easy |
Swift |
82 |
Remove Duplicates from Sorted List II |
Medium |
Swift |
81 |
Search in Rotated Sorted Array II |
Medium |
Swift |
80 |
Remove Duplicates from Sorted Array II |
Medium |
Swift |
79 |
Word Search |
Medium |
Swfit |
78 |
Subsets |
Medium |
Swift |
77 |
Combinations |
Medium |
Swift |
76 |
Minimum Window Substring |
Hard |
Swift |
75 |
Sort Colors |
Medium |
Swift |
74 |
Search a 2D Matrix |
Medium |
Swift |
73 |
Set Matrix Zeroes |
Medium |
Swift |
72 |
Edit Distance |
Hard |
Swift |
71 |
Simplify Path |
Medium |
Swift |
70 |
Climbing Stairs |
Easy |
Swift |
69 |
Sqrt(x) |
Medium |
Swift |
68 |
Text Justification |
Hard |
Swift |
67 |
Add Binary |
Easy |
Swift |
66 |
Plus One |
Easy |
Swift |
65 |
Valid Number |
Hard |
Swift |
64 |
Minimum Path Sum |
Medium |
Swift |
63 |
Unique Paths II |
Medium |
Swift |
62 |
Unique Paths |
Medium |
Swift |
61 |
Rotate List |
Medium |
Swift |
60 |
Permutation Sequence |
Medium |
Swift |
59 |
Spiral Matrix II |
Medium |
Swift |
58 |
Length of Last Word |
Easy |
Swift |
57 |
Insert Interval |
Hard |
Swift |
56 |
Merge Intervals |
Hard |
Swift |
55 |
Jump Game |
Medium |
Swift |
54 |
Spiral Matrix |
Medium |
Swift |
53 |
Maximum Subarray |
Medium |
Swift |
52 |
N-Queens II |
Hard |
Swift |
51 |
N-Queens |
Hard |
Swift |
50 |
“Pow(x, n)” |
Medium |
Swift |
49 |
Group Anagrams |
Medium |
Swift |
48 |
Rotate Image |
Medium |
Swift |
47 |
Permutations II |
Medium |
Swift |
46 |
Permutations |
Medium |
|
45 |
Jump Game II |
Hard |
Swift |
44 |
Wildcard Matching |
Hard |
Swift |
43 |
Multiply Strings |
Medium |
Swift |
42 |
Trapping Rain Water |
Hard |
Swift |
41 |
First Missing Positive |
Hard |
Swift |
40 |
Combination Sum II |
Medium |
Swift |
39 |
Combination Sum |
Medium |
Swift |
38 |
Count and Say |
Easy |
Swift |
37 |
Sudoku Solver |
Hard |
Swift |
36 |
Valid Sudoku |
Easy |
Swift |
35 |
Search Insert Position |
Medium |
Swift |
34 |
Search for a Range |
Medium |
Swift |
33 |
Search in Rotated Sorted Array |
Hard |
Swift |
32 |
Longest Valid Parentheses |
Hard |
Swift |
31 |
Next Permutation |
Medium |
|
30 |
Substring with Concatenation of All Words |
Hard |
Swift |
29 |
Divide Two Integers |
Medium |
Swift |
28 |
Implement strStr() |
Easy |
Swfit |
27 |
Remove Element |
Easy |
Swift |
26 |
Remove Duplicates from Sorted Array |
Easy |
Swift |
25 |
Reverse Nodes in k-Group |
Hard |
Swift |
24 |
Swap Nodes in Pairs |
Easy |
Swift |
23 |
Merge k Sorted Lists |
Hard |
Swift |
22 |
Generate Parentheses |
Medium |
Swift |
21 |
Merge Two Sorted Lists |
Easy |
Swift |
20 |
Valid Parentheses |
Easy |
Swift |
19 |
Remove Nth Node From End of List |
Easy |
Swift |
18 |
4Sum |
Medium |
Swift |
17 |
Letter Combinations of a Phone Number |
Medium |
Swift |
16 |
3Sum Closest |
Medium |
Swift |
15 |
3Sum |
Medium |
Swift |
14 |
Longest Common Prefix |
Easy |
Swift |
13 |
Roman to Integer |
Easy |
Swift |
12 |
Integer to Roman |
Medium |
Swift |
11 |
Container With Most Water |
Medium |
Swift |
10 |
Regular Expression Matching |
Hard |
Swift |
9 |
Palindrome Number |
Easy |
Swift |
8 |
String to Integer (atoi) |
Easy |
Swift |
7 |
Reverse Integer |
Easy |
Swift |
6 |
ZigZag Conversion |
Easy |
Swift |
5 |
Longest Palindromic Substring |
Medium |
Swift |
4 |
Median of Two Sorted Arrays |
Hard |
Swift |
3 |
Longest Substring Without Repeating Characters |
Medium |
Swift |
2 |
Add Two Numbers |
Medium |
Swift |
1 |
Two Sum |
Easy |