526 |
Beautiful Arrangement |
|
Medium |
525 |
Contiguous Array |
|
Medium |
524 |
|
|
|
523 |
|
|
|
522 |
|
|
|
521 |
|
|
|
520 |
Detect Capital |
Ruby |
Easy |
519 |
|
|
|
518 |
|
|
|
517 |
Super Washing Machines |
|
Hard |
516 |
Longest Palindromic Subsequence |
|
Medium |
515 |
Find Largest Value in Each Tree Row |
|
Medium |
514 |
|
|
|
513 |
Find Bottom Left Tree Value |
|
Medium |
512 |
|
|
|
511 |
|
|
|
510 |
|
|
|
509 |
|
|
|
508 |
Most Frequent Subtree Sum |
|
Medium |
507 |
|
|
|
506 |
Relative Ranks |
Ruby |
Easy |
505 |
The Maze II |
🔒 |
Medium |
504 |
Base 7 |
Ruby |
Easy |
503 |
Next Greater Element II |
|
Medium |
502 |
IPO |
|
Hard |
501 |
Find Mode in Binary Search Tree |
Ruby |
Easy |
500 |
Keyboard Row |
Ruby |
Easy |
499 |
The Maze III |
|
Hard |
498 |
Diagonal Traverse |
|
Medium |
497 |
|
|
|
496 |
Next Greater Element I |
|
Easy |
495 |
Teemo Attacking |
|
Medium |
494 |
Target Sum |
|
Medium |
493 |
Reverse Pairs |
|
Hard |
492 |
Construct the Rectangle |
|
Easy |
491 |
Increasing Subsequences |
|
Medium |
490 |
The Maze |
🔒 |
Medium |
489 |
|
|
|
488 |
Zuma Game |
|
Hard |
487 |
Max Consecutive Ones II |
🔒 |
Medium |
486 |
Predict the Winner |
|
Medium |
485 |
Max Consecutive Ones |
|
Easy |
484 |
Find Permutation |
🔒 |
Medium |
483 |
Smallest Good Base |
|
Hard |
482 |
License Key Formatting |
|
Medium |
481 |
Magical String |
|
Medium |
480 |
Sliding Window Median |
|
Hard |
479 |
|
|
|
478 |
|
|
|
477 |
Total Hamming Distance |
|
Medium |
476 |
Number Complement |
|
Easy |
475 |
Heaters |
|
Easy |
474 |
Ones and Zeroes |
|
Medium |
473 |
Matchsticks to Square |
|
Medium |
472 |
Concatenated Words |
|
Hard |
471 |
Encode String with Shortest Length |
🔒 |
Hard |
470 |
|
|
|
469 |
Convex Polygon |
🔒 |
Medium |
468 |
Validate IP Address |
Ruby |
Medium |
467 |
Unique Substrings in Wraparound String |
|
Medium |
466 |
Count The Repetitions |
|
Hard |
465 |
Optimal Account Balancing |
🔒 |
Hard |
464 |
Can I Win |
|
Medium |
463 |
Island Perimeter |
|
Easy |
462 |
Minimum Moves to Equal Array Elements II |
|
Medium |
461 |
Hamming Distance |
|
Easy |
460 |
LFU Cache |
|
Hard |
459 |
Repeated Substring Pattern |
|
Easy |
458 |
|
|
|
457 |
|
|
|
456 |
132 Pattern |
|
Medium |
455 |
Assign Cookies |
Ruby |
Easy |
454 |
4Sum II |
|
Medium |
453 |
Minimum Moves to Equal Array Elements |
Ruby |
Easy |
452 |
Minimum Number of Arrows to Burst Balloons |
|
Medium |
451 |
Sort Characters By Frequency |
Ruby |
Medium |
450 |
Delete Node in a BST |
|
Medium |
449 |
Serialize and Deserialize BST |
Ruby |
Medium |
448 |
Find All Numbers Disappeared in an Array |
Ruby |
Easy |
447 |
Number of Boomerangs |
|
Easy |
446 |
Arithmetic Slices II - Subsequence |
|
Hard |
445 |
Add Two Numbers II |
|
Medium |
444 |
Sequence Reconstruction |
🔒 |
Medium |
443 |
|
|
|
442 |
Find All Duplicates in an Array |
|
Medium |
441 |
Arranging Coins |
|
Easy |
440 |
K-th Smallest in Lexicographical Order |
|
Hard |
439 |
Ternary Expression Parser |
🔒 |
Medium |
438 |
Find All Anagrams in a String |
|
Easy |
437 |
Path Sum III |
|
Easy |
436 |
Find Right Interval |
|
Medium |
435 |
Non-overlapping Intervals |
|
Medium |
434 |
Number of Segments in a String |
|
Easy |
433 |
|
|
|
432 |
All O(1) Data Structure |
|
Hard |
431 |
|
|
|
430 |
|
|
|
429 |
|
|
|
428 |
|
|
|
427 |
|
|
|
426 |
|
|
|
425 |
Word Squares |
🔒 |
Hard |
424 |
Longest Repeating Character Replacement |
|
Medium |
423 |
Reconstruct Original Digits from English |
|
Medium |
422 |
Valid Word Square |
🔒 |
Easy |
421 |
Maximum XOR of Two Numbers in an Array |
|
Medium |
420 |
Strong Password Checker |
|
Hard |
419 |
Battleships in a Board |
|
Medium |
418 |
Sentence Screen Fitting |
🔒 |
Medium |
417 |
Pacific Atlantic Water Flow |
|
Medium |
416 |
Partition Equal Subset Sum |
|
Medium |
415 |
Add Strings |
|
Easy |
414 |
Third Maximum Number |
|
Easy |
413 |
Arithmetic Slices |
|
Medium |
412 |
Fizz Buzz |
Ruby |
Easy |
411 |
Minimum Unique Word Abbreviation |
🔒 |
Hard |
410 |
Split Array Largest Sum |
|
Hard |
409 |
Longest Palindrome |
Ruby |
Easy |
408 |
Valid Word Abbreviation |
🔒 |
Easy |
407 |
Trapping Rain Water II |
|
Hard |
406 |
Queue Reconstruction by Height |
|
Medium |
405 |
Convert a Number to Hexadecimal |
Ruby |
Easy |
404 |
Sum of Left Leaves |
Ruby |
Easy |
403 |
Frog Jump |
|
Hard |
402 |
Remove K Digits |
|
Medium |
401 |
Binary Watch |
|
Easy |
400 |
Nth Digit |
|
Easy |
399 |
Evaluate Division |
|
Medium |
398 |
Random Pick Index |
🔜 |
Medium |
397 |
Integer Replacement |
|
Medium |
396 |
Rotate Function |
Ruby |
Easy |
395 |
Longest Substring with At Least K Repeating Characters |
|
Medium |
394 |
Decode String |
Ruby |
Medium |
393 |
UTF-8 Validation |
Ruby |
Medium |
392 |
Is Subsequence |
|
Medium |
391 |
Perfect Rectangle |
|
Hard |
390 |
Elimination Game |
|
Medium |
389 |
Find the Difference |
Ruby |
Easy |
388 |
Longest Absolute File Path |
|
Medium |
387 |
First Unique Character in a String |
Ruby |
Easy |
386 |
Lexicographical Numbers |
🔜 |
Medium |
385 |
Mini Parser |
Ruby |
Medium |
384 |
Shuffle an Array |
🔜 |
Medium |
383 |
Ransom Note |
Ruby |
Easy |
382 |
Linked List Random Node |
🔜 |
Medium |
381 |
Insert Delete GetRandom O(1) - Duplicates allowed |
🔜 |
Hard |
380 |
Insert Delete GetRandom O(1) |
🔜 |
Hard |
379 |
Design Phone Directory |
🔒 |
Medium |
378 |
Kth Smallest Element in a Sorted Matrix |
|
Medium |
377 |
Combination Sum IV |
|
Medium |
376 |
Wiggle Subsequence |
|
Medium |
375 |
Guess Number Higher or Lower II |
|
Medium |
374 |
Guess Number Higher or Lower |
🔜 |
Easy |
373 |
Find K Pairs with Smallest Sums |
|
Medium |
372 |
Super Pow |
|
Medium |
371 |
Sum of Two Integers |
Ruby |
Easy |
370 |
Range Addition |
🔒 |
Medium |
369 |
Plus One Linked List |
🔒 |
Medium |
368 |
Largest Divisible Subset |
|
Medium |
367 |
Valid Perfect Square |
Ruby |
Easy |
366 |
Find Leaves of Binary Tree |
🔒 |
Medium |
365 |
Water and Jug Problem |
|
Medium |
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 |
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 |
350 |
Intersection of Two Arrays II |
Ruby |
Easy |
349 |
Intersection of Two Arrays |
Ruby |
Easy |
348 |
Design Tic-Tac-Toe |
🔒 |
Medium |
347 |
Top K Frequent Elements |
Ruby |
Medium |
346 |
Moving Average from Data Stream |
🔒 |
Easy |
345 |
Reverse Vowels of a String |
Ruby |
Easy |
344 |
Reverse String |
Ruby |
Easy |
343 |
Integer Break |
Ruby |
Medium |
342 |
Power of Four |
Ruby |
Easy |
341 |
Flatten Nested List Iterator |
🔒 |
Medium |
340 |
Longest Substring with At Most K Distinct Characters |
🔒 |
Hard |
339 |
Nested List Weight Sum |
🔒 |
Easy |
338 |
Counting Bits |
Ruby |
Medium |
337 |
House Robber III |
Ruby |
Medium |
336 |
Palindrome Pairs |
Ruby |
Hard |
335 |
Self Crossing |
Ruby |
Medium |
334 |
Increasing Triplet Subsequence |
Ruby |
Medium |
333 |
Largest BST Subtree |
🔒 |
Medium |
332 |
Reconstruct Itinerary |
Ruby |
Medium |
331 |
Verify Preorder Serialization of a Binary Tree |
Ruby |
Medium |
330 |
Patching Array |
Ruby |
Medium |
329 |
Longest Increasing Path in a Matrix |
Ruby |
Medium |
328 |
Odd Even Linked List |
Ruby |
Easy |
327 |
Count of Range Sum |
Ruby |
Hard |
326 |
Power of Three |
Ruby |
Easy |
325 |
Maximum Size Subarray Sum Equals k |
🔒 |
Easy |
324 |
Wiggle Sort II |
Ruby |
Medium |
323 |
Number of Connected Components in an Undirected Graph |
🔒 |
Easy |
322 |
Coin Change |
Ruby |
Medium |
321 |
Create Maximum Number |
Ruby |
Hard |
320 |
Generalized Abbreviation |
🔒 |
Medium |
319 |
Bulb Switcher |
Ruby |
Medium |
318 |
Maximum Product of Word Lengths |
Ruby |
Medium |
317 |
Shortest Distance from All Buildings |
🔒 |
Hard |
316 |
Remove Duplicate Letters |
Ruby |
Medium |
315 |
Count of Smaller Numbers After Self |
Ruby |
Hard |
314 |
Binary Tree Vertical Order Traversal |
🔒 |
Medium |
313 |
Super Ugly Number |
Ruby |
Medium |
312 |
Burst Balloons |
Ruby |
Medium |
311 |
Sparse Matrix Multiplication |
🔒 |
Medium |
310 |
Minimum Height Trees |
Ruby |
Medium |
309 |
Best Time to Buy and Sell Stock with Cooldown |
Ruby |
Medium |
308 |
Range Sum Query 2D - Mutable |
🔒 |
Hard |
307 |
Range Sum Query - Mutable |
Ruby |
Medium |
306 |
Additive Number |
Ruby |
Medium |
305 |
Number of Islands II |
🔒 |
Hard |
304 |
Range Sum Query 2D - Immutable |
Ruby |
Medium |
303 |
Range Sum Query - Immutable |
Ruby |
Easy |
302 |
Smallest Rectangle Enclosing Black Pixels |
🔒 |
Medium |
301 |
Remove Invalid Parentheses |
Ruby |
Medium |
300 |
Longest Increasing Subsequence |
Ruby |
Medium |
299 |
Bulls and Cows |
Ruby |
Easy |
298 |
Binary Tree Longest Consecutive Sequence |
🔒 |
Medium |
297 |
Serialize and Deserialize Binary Tree |
Ruby |
Medium |
296 |
Best Meeting Point |
🔒 |
Medium |
295 |
Find Median from Data Stream |
Ruby |
Hard |
294 |
Flip Game II |
🔒 |
Medium |
293 |
Flip Game |
🔒 |
Easy |
292 |
Nim Game |
Ruby |
Easy |
291 |
Word Pattern II |
🔒 |
Hard |
290 |
Word Pattern |
Ruby |
Easy |
289 |
Game of Life |
Ruby |
Medium |
288 |
Unique Word Abbreviation |
🔒 |
Easy |
287 |
Find the Duplicate Number |
Ruby |
Hard |
286 |
Walls and Gates |
🔒 |
Medium |
285 |
Inorder Successor in BST |
🔒 |
Medium |
284 |
Peeking Iterator |
🔜 |
Medium |
283 |
Move Zeroes |
Ruby |
Easy |
282 |
Expression Add Operators |
Ruby |
Hard |
281 |
Zigzag Iterator |
🔒 |
Medium |
280 |
Wiggle Sort |
🔒 |
Medium |
279 |
Perfect Squares |
Ruby |
Medium |
278 |
First Bad Version |
Ruby |
Easy |
277 |
Find the Celebrity |
🔒 |
Medium |
276 |
Paint Fence |
🔒 |
Easy |
275 |
H-Index II |
Ruby |
Medium |
274 |
H-Index |
Ruby |
Medium |
273 |
Integer to English Words |
Ruby |
Medium |
272 |
Closest Binary Search Tree Value II |
🔒 |
Hard |
271 |
Encode and Decode Strings |
🔒 |
Medium |
270 |
Closest Binary Search Tree Value |
🔒 |
Easy |
269 |
Alien Dictionary |
🔒 |
Hard |
268 |
Missing Number |
Ruby |
Medium |
267 |
Palindrome Permutation II |
🔒 |
Medium |
266 |
Palindrome Permutation |
🔒 |
Easy |
265 |
Paint House II |
🔒 |
Hard |
264 |
Ugly Number II |
Ruby |
Medium |
263 |
Ugly Number |
Ruby |
Easy |
262 |
Trips and Users |
MySQL |
Hard |
261 |
Graph Valid Tree |
🔒 |
Medium |
260 |
Single Number III |
Ruby |
Medium |
259 |
3Sum Smaller |
🔒 |
Medium |
258 |
Add Digits |
Ruby |
Easy |
257 |
Binary Tree Paths |
Ruby |
Easy |
256 |
Paint House |
🔒 |
Medium |
255 |
Verify Preorder Sequence in Binary Search Tree |
🔒 |
Medium |
254 |
Factor Combinations |
🔒 |
Medium |
253 |
Meeting Rooms II |
🔒 |
Medium |
252 |
Meeting Rooms |
🔒 |
Easy |
251 |
Flatten 2D Vector |
🔒 |
Medium |
250 |
Count Univalue Subtrees |
🔒 |
Medium |
249 |
Group Shifted Strings |
🔒 |
Easy |
248 |
Strobogrammatic Number III |
🔒 |
Hard |
247 |
Strobogrammatic Number II |
🔒 |
Medium |
246 |
Strobogrammatic Number |
🔒 |
Easy |
245 |
Shortest Word Distance III |
🔒 |
Medium |
244 |
Shortest Word Distance II |
🔒 |
Medium |
243 |
Shortest Word Distance |
🔒 |
Easy |
242 |
Valid Anagram |
Ruby |
Easy |
241 |
Different Ways to Add Parentheses |
Ruby |
Medium |
240 |
Search a 2D Matrix II |
Ruby |
Medium |
239 |
Sliding Window Maximum |
Ruby |
Hard |
238 |
Product of Array Except Self |
Ruby |
Medium |
237 |
Delete Node in a Linked List |
Ruby |
Easy |
236 |
Lowest Common Ancestor of a Binary Tree |
Ruby |
Medium |
235 |
Lowest Common Ancestor of a Binary Search Tree |
Ruby |
Easy |
234 |
Palindrome Linked List |
Ruby |
Easy |
233 |
Number of Digit One |
Ruby |
Medium |
232 |
Implement Queue using Stacks |
Ruby |
Easy |
231 |
Power of Two |
Ruby |
Easy |
230 |
Kth Smallest Element in a BST |
Ruby |
Medium |
229 |
Majority Element II |
Ruby |
Medium |
228 |
Summary Ranges |
Ruby |
Easy |
227 |
Basic Calculator II |
Ruby |
Medium |
226 |
Invert Binary Tree |
Ruby |
Easy |
225 |
Implement Stack using Queues |
Ruby |
Easy |
224 |
Basic Calculator |
Ruby |
Medium |
223 |
Rectangle Area |
Ruby |
Easy |
222 |
Count Complete Tree Nodes |
Ruby |
Medium |
221 |
Maximal Square |
Ruby |
Medium |
220 |
Contains Duplicate III |
Ruby |
Medium |
219 |
Contains Duplicate II |
Ruby |
Easy |
218 |
The Skyline Problem |
Ruby |
Hard |
217 |
Contains Duplicate |
Ruby |
Easy |
216 |
Combination Sum III |
Ruby |
Medium |
215 |
Kth Largest Element in an Array |
Ruby |
Medium |
214 |
Shortest Palindrome |
Ruby |
Hard |
213 |
House Robber II |
Ruby |
Medium |
212 |
Word Search II |
Ruby |
Hard |
211 |
Add and Search Word - Data structure design |
Ruby |
Medium |
210 |
Course Schedule II |
Ruby |
Medium |
209 |
Minimum Size Subarray Sum |
Ruby |
Medium |
208 |
Implement Trie (Prefix Tree) |
Ruby |
Medium |
207 |
Course Schedule |
Ruby |
Medium |
206 |
Reverse Linked List |
Ruby |
Easy |
205 |
Isomorphic Strings |
Ruby |
Easy |
204 |
Count Primes |
Ruby |
Easy |
203 |
Remove Linked List Elements |
Ruby |
Easy |
202 |
Happy Number |
Ruby |
Easy |
201 |
Bitwise AND of Numbers Range |
Ruby |
Medium |
200 |
Number of Islands |
Ruby |
Medium |
199 |
Binary Tree Right Side View |
Ruby |
Medium |
198 |
House Robber |
Ruby |
Easy |
197 |
Rising Temperature |
MySQL |
Easy |
196 |
Delete Duplicate Emails |
MySQL |
Easy |
195 |
Tenth Line |
Bash |
Easy |
194 |
Transpose File |
Bash |
Medium |
193 |
Valid Phone Numbers |
Bash |
Easy |
192 |
Word Frequency |
Bash |
Medium |
191 |
Number of 1 Bits |
Ruby |
Easy |
190 |
Reverse Bits |
Ruby |
Easy |
189 |
Rotate Array |
Ruby |
Easy |
188 |
Best Time to Buy and Sell Stock IV |
Ruby |
Hard |
187 |
Repeated DNA Sequences |
Ruby |
Medium |
186 |
Reverse Words in a String II |
🔒 |
Medium |
185 |
Department Top Three Salaries |
MySQL |
Hard |
184 |
Department Highest Salary |
MySQL |
Medium |
183 |
Customers Who Never Order |
MySQL |
Easy |
182 |
Duplicate Emails |
MySQL |
Easy |
181 |
Employees Earning More Than Their Managers |
MySQL |
Easy |
180 |
Consecutive Numbers |
MySQL |
Medium |
179 |
Largest Number |
Ruby |
Medium |
178 |
Rank Scores |
MySQL |
Medium |
177 |
Nth Highest Salary |
MySQL |
Medium |
176 |
Second Highest Salary |
MySQL |
Easy |
175 |
Combine Two Tables |
MySQL |
Easy |
174 |
Dungeon Game |
Ruby |
Hard |
173 |
Binary Search Tree Iterator |
Ruby |
Medium |
172 |
Factorial Trailing Zeroes |
Ruby |
Easy |
171 |
Excel Sheet Column Number |
Ruby |
Easy |
170 |
Two Sum III - Data structure design |
🔒 |
Easy |
169 |
Majority Element |
Ruby |
Easy |
168 |
Excel Sheet Column Title |
Ruby |
Easy |
167 |
Two Sum II - Input array is sorted |
🔒 |
Medium |
166 |
Fraction to Recurring Decimal |
Ruby |
Medium |
165 |
Compare Version Numbers |
Ruby |
Easy |
164 |
Maximum Gap |
Ruby |
Hard |
163 |
Missing Ranges |
🔒 |
Medium |
162 |
Find Peak Element |
Ruby |
Medium |
161 |
One Edit Distance |
🔒 |
Medium |
160 |
Intersection of Two Linked Lists |
🔜 |
Easy |
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 |
156 |
Binary Tree Upside Down |
🔒 |
Medium |
155 |
Min Stack |
Ruby |
Easy |
154 |
Find Minimum in Rotated Sorted Array II |
Ruby |
Hard |
153 |
Find Minimum in Rotated Sorted Array |
Ruby |
Medium |
152 |
Maximum Product Subarray |
Ruby |
Medium |
151 |
Reverse Words in a String |
🔜 |
Medium |
150 |
Evaluate Reverse Polish Notation |
Ruby |
Medium |
149 |
Max Points on a Line |
Ruby |
Hard |
148 |
Sort List |
Ruby |
Medium |
147 |
Insertion Sort List |
Ruby |
Medium |
146 |
LRU Cache |
Ruby |
Hard |
145 |
Binary Tree Postorder Traversal |
Ruby |
Hard |
144 |
Binary Tree Preorder Traversal |
Ruby |
Medium |
143 |
Reorder List |
Ruby |
Medium |
142 |
Linked List Cycle II |
🔜 |
Medium |
141 |
Linked List Cycle |
🔜 |
Medium |
140 |
Word Break II |
Ruby |
Hard |
139 |
Word Break |
Ruby |
Medium |
138 |
Copy List with Random Pointer |
🔜 |
Hard |
137 |
Single Number II |
Ruby |
Medium |
136 |
Single Number |
Ruby |
Medium |
135 |
Candy |
Ruby |
Hard |
134 |
Gas Station |
Ruby |
Medium |
133 |
Clone Graph |
🔜 |
Medium |
132 |
Palindrome Partitioning II |
Ruby |
Hard |
131 |
Palindrome Partitioning |
Ruby |
Medium |
130 |
Surrounded Regions |
Ruby |
Medium |
129 |
Sum Root to Leaf Numbers |
Ruby |
Medium |
128 |
Longest Consecutive Sequence |
Ruby |
Hard |
127 |
Word Ladder |
Ruby |
Medium |
126 |
Word Ladder II |
🔜 |
Hard |
125 |
Valid Palindrome |
Ruby |
Easy |
124 |
Binary Tree Maximum Path Sum |
Ruby |
Hard |
123 |
Best Time to Buy and Sell Stock III |
Ruby |
Hard |
122 |
Best Time to Buy and Sell Stock II |
Ruby |
Medium |
121 |
Best Time to Buy and Sell Stock |
Ruby |
Medium |
120 |
Triangle |
Ruby |
Medium |
119 |
Pascal's Triangle II |
Ruby |
Easy |
118 |
Pascal's Triangle |
Ruby |
Easy |
117 |
Populating Next Right Pointers in Each Node II |
🔜 |
Hard |
116 |
Populating Next Right Pointers in Each Node |
🔜 |
Medium |
115 |
Distinct Subsequences |
Ruby |
Hard |
114 |
Flatten Binary Tree to Linked List |
Ruby |
Medium |
113 |
Path Sum II |
Ruby |
Medium |
112 |
Path Sum |
Ruby |
Easy |
111 |
Minimum Depth of Binary Tree |
Ruby |
Easy |
110 |
Balanced Binary Tree |
Ruby |
Easy |
109 |
Convert Sorted List to Binary Search Tree |
Ruby |
Medium |
108 |
Convert Sorted Array to Binary Search Tree |
Ruby |
Medium |
107 |
Binary Tree Level Order Traversal II |
Ruby |
Easy |
106 |
Construct Binary Tree from Inorder and Postorder Traversal |
Ruby |
Medium |
105 |
Construct Binary Tree from Preorder and Inorder Traversal |
Ruby |
Medium |
104 |
Maximum Depth of Binary Tree |
Ruby |
Easy |
103 |
Binary Tree Zigzag Level Order Traversal |
Ruby |
Medium |
102 |
Binary Tree Level Order Traversal |
Ruby |
Easy |
101 |
Symmetric Tree |
Ruby |
Easy |
100 |
Same Tree |
Ruby |
Easy |
99 |
Recover Binary Search Tree |
Ruby |
Hard |
98 |
Validate Binary Search Tree |
Ruby |
Medium |
97 |
Interleaving String |
Ruby |
Hard |
96 |
Unique Binary Search Trees |
Ruby |
Medium |
95 |
Unique Binary Search Trees II |
Ruby |
Medium |
94 |
Binary Tree Inorder Traversal |
Ruby |
Medium |
93 |
Restore IP Addresses |
Ruby |
Medium |
92 |
Reverse Linked List II |
Ruby |
Medium |
91 |
Decode Ways |
Ruby |
Medium |
90 |
Subsets II |
Ruby |
Medium |
89 |
Gray Code |
Ruby |
Medium |
88 |
Merge Sorted Array |
Ruby |
Easy |
87 |
Scramble String |
Ruby |
Hard |
86 |
Partition List |
Ruby |
Medium |
85 |
Maximal Rectangle |
Ruby |
Hard |
84 |
Largest Rectangle in Histogram |
Ruby |
Hard |
83 |
Remove Duplicates from Sorted List |
Ruby |
Easy |
82 |
Remove Duplicates from Sorted List II |
Ruby |
Medium |
81 |
Search in Rotated Sorted Array II |
Ruby |
Medium |
80 |
Remove Duplicates from Sorted Array II |
Ruby |
Medium |
79 |
Word Search |
Ruby |
Medium |
78 |
Subsets |
Ruby |
Medium |
77 |
Combinations |
Ruby |
Medium |
76 |
Minimum Window Substring |
Ruby |
Hard |
75 |
Sort Colors |
Ruby |
Medium |
74 |
Search a 2D Matrix |
Ruby |
Medium |
73 |
Set Matrix Zeroes |
Ruby |
Medium |
72 |
Edit Distance |
Ruby |
Hard |
71 |
Simplify Path |
Ruby |
Medium |
70 |
Climbing Stairs |
Ruby |
Easy |
69 |
Sqrt() |
Ruby |
Medium |
68 |
Text Justification |
Ruby |
Hard |
67 |
Add Binary |
Ruby |
Easy |
66 |
Plus One |
Ruby |
Easy |
65 |
Valid Number |
Ruby |
Hard |
64 |
Minimum Path Sum |
Ruby |
Medium |
63 |
Unique Paths II |
Ruby |
Medium |
62 |
Unique Paths |
Ruby |
Medium |
61 |
Rotate List |
Ruby |
Medium |
60 |
Permutation Sequence |
Ruby |
Medium |
59 |
Spiral Matrix II |
Ruby |
Medium |
58 |
Length of Last Word |
Ruby |
Easy |
57 |
Insert Interval |
Ruby |
Hard |
56 |
Merge Intervals |
Ruby |
Hard |
55 |
Jump Game |
Ruby |
Medium |
54 |
Spiral Matrix |
Ruby |
Medium |
53 |
Maximum Subarray |
Ruby |
Medium |
52 |
N-Queens II |
Ruby |
Hard |
51 |
N-Queens |
Ruby |
Hard |
50 |
Pow(x, n) |
Ruby |
Medium |
49 |
Group Anagrams |
Ruby |
Medium |
48 |
Rotate Image |
Ruby |
Medium |
47 |
Permutations II |
Ruby |
Medium |
46 |
Permutations |
Ruby |
Medium |
45 |
Jump Game II |
Ruby |
Hard |
44 |
Wildcard Matching |
Ruby |
Hard |
43 |
Multiply Strings |
Ruby |
Medium |
42 |
Trapping Rain Water |
Ruby |
Hard |
41 |
First Missing Positive |
Ruby |
Hard |
40 |
Combination Sum II |
Ruby |
Medium |
39 |
Combination Sum |
Ruby |
Medium |
38 |
Count and Say |
Ruby |
Easy |
37 |
Sudoku Solver |
Ruby |
Hard |
36 |
Valid Sudoku |
Ruby |
Easy |
35 |
Search Insert Position |
Ruby |
Medium |
34 |
Search for a Range |
Ruby |
Medium |
33 |
Search in Rotated Sorted Array |
Ruby |
Hard |
32 |
Longest Valid Parentheses |
Ruby |
Hard |
31 |
Next Permutation |
Ruby |
Medium |
30 |
Substring with Concatenation of All Words |
Ruby |
Hard |
29 |
Divide Two Integers |
Ruby |
Medium |
28 |
Implement strStr() |
Ruby |
Easy |
27 |
Remove Element |
Ruby |
Easy |
26 |
Remove Duplicates from Sorted Array |
Ruby |
Easy |
25 |
Reverse Nodes in k-Group |
Ruby |
Hard |
24 |
Swap Nodes in Pairs |
Ruby |
Medium |
23 |
Merge k Sorted Lists |
Ruby |
Hard |
22 |
Generate Parentheses |
Ruby |
Medium |
21 |
Merge Two Sorted Lists |
Ruby |
Easy |
20 |
Valid Parentheses |
Ruby |
Easy |
19 |
Remove Nth Node From End of List |
Ruby |
Easy |
18 |
4Sum |
Ruby |
Medium |
17 |
Letter Combinations of a Phone Number |
Ruby |
Medium |
16 |
3Sum Closest |
Ruby |
Medium |
15 |
3Sum |
Ruby |
Medium |
14 |
Longest Common Prefix |
Ruby |
Easy |
13 |
Roman to Integer |
Ruby |
Easy |
12 |
Integer to Roman |
Ruby |
Medium |
11 |
Container With Most Water |
Ruby |
Medium |
10 |
Regular Expression Matching |
Ruby |
Hard |
9 |
Palindrome Number |
Ruby |
Easy |
8 |
String to Integer (atoi) |
Ruby |
Easy |
7 |
Reverse Integer |
Ruby |
Easy |
6 |
ZigZag Conversion |
Ruby |
Easy |
5 |
Longest Palindromic Substring |
Ruby |
Medium |
4 |
Median of Two Sorted Arrays |
Ruby |
Hard |
3 |
Longest Substring Without Repeating Characters |
Ruby |
Medium |
2 |
Add Two Numbers |
Ruby |
Medium |
1 |
Two Sum |
Ruby |
Medium |