| 85 |
Maximal Rectangle |
31% |
Hard |
❤ |
| 87 |
Scramble String |
30% |
Hard |
❤ |
| 90 |
Subsets II |
40% |
Medium |
❤ |
| 91 |
Decode Ways |
21% |
Medium |
❤ |
| 93 |
Restore IP Addresses |
29% |
Medium |
❤ |
| 95 |
Unique Binary Search Trees II |
33% |
Medium |
❤ |
| 97 |
Interleaving String |
26% |
Hard |
❤ |
| 98 |
Validate Binary Search Tree |
24% |
Medium |
❤ |
| 99 |
Recover Binary Search Tree |
33% |
Hard |
❤ |
| 101 |
Symmetric Tree |
41% |
Easy |
❤ |
| 105 |
Construct Binary Tree from Preorder and Inorder Traversal |
37% |
Medium |
❤ |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
36% |
Medium |
❤ |
| 114 |
Flatten Binary Tree to Linked List |
39% |
Medium |
❤ |
| 115 |
Distinct Subsequences |
33% |
Hard |
❤ |
| 120 |
Triangle |
37% |
Medium |
❤ |
| 124 |
Binary Tree Maximum Path Sum |
28% |
Hard |
❤ |
| 126 |
Word Ladder II |
16% |
Hard |
❤ |
| 127 |
Word Ladder |
21% |
Medium |
❤ |
| 130 |
Surrounded Regions |
21% |
Medium |
❤ |
| 131 |
Palindrome Partitioning |
38% |
Medium |
❤ |
| 132 |
Palindrome Partitioning II |
26% |
Hard |
❤ |
| 134 |
Gas Station |
32% |
Medium |
❤ |
| 139 |
Word Break |
33% |
Medium |
❤ |
| 140 |
Word Break II |
26% |
Hard |
❤ |
| 143 |
Reorder List |
28% |
Medium |
❤ |
| 144 |
Binary Tree Preorder Traversal |
49% |
Medium |
❤ |
| 146 |
LRU Cache |
22% |
Hard |
❤ |
| 147 |
Insertion Sort List |
35% |
Medium |
❤ |
| 148 |
Sort List |
32% |
Medium |
❤ |
| 149 |
Max Points on a Line |
15% |
Hard |
❤ |
| 152 |
Maximum Product Subarray |
27% |
Medium |
❤ |
| 166 |
Fraction to Recurring Decimal |
18% |
Medium |
❤ |
| 168 |
Excel Sheet Column Title |
28% |
Easy |
❤ |
| 169 |
Majority Element |
50% |
Easy |
❤ |
| 174 |
Dungeon Game |
25% |
Hard |
❤ |
| 179 |
Largest Number |
24% |
Medium |
❤ |
| 188 |
Best Time to Buy and Sell Stock IV |
25% |
Hard |
❤ |
| 198 |
House Robber |
40% |
Easy |
❤ |
| 201 |
Bitwise AND of Numbers Range |
35% |
Medium |
❤ |
| 204 |
Count Primes |
27% |
Easy |
❤ |
| 205 |
Isomorphic Strings |
36% |
Easy |
❤ |
| 207 |
Course Schedule |
35% |
Medium |
❤ |
| 208 |
Implement Trie (Prefix Tree) |
35% |
Medium |
❤ |
| 211 |
Add and Search Word - Data structure design |
28% |
Medium |
❤ |
| 212 |
Word Search II |
26% |
Hard |
❤ |
| 214 |
Shortest Palindrome |
26% |
Hard |
❤ |
| 215 |
Kth Largest Element in an Array |
44% |
Medium |
❤ |
| 218 |
The Skyline Problem |
30% |
Hard |
❤ |
| 220 |
Contains Duplicate III |
19% |
Medium |
❤ |
| 221 |
Maximal Square |
31% |
Medium |
❤ |
| 229 |
Majority Element II |
30% |
Medium |
❤ |
| 233 |
Number of Digit One |
29% |
Hard |
❤ |
| 239 |
Sliding Window Maximum |
36% |
Hard |
❤ |
| 240 |
Search a 2D Matrix II |
39% |
Medium |
❤ |
| 260 |
Single Number III |
55% |
Medium |
❤ |
| 264 |
Ugly Number II |
34% |
Medium |
❤ |
| 273 |
Integer to English Words |
23% |
Hard |
❤ |
| 275 |
H-Index II |
35% |
Medium |
❤ |
| 279 |
Perfect Squares |
39% |
Medium |
❤ |
| 282 |
Expression Add Operators |
31% |
Hard |
❤ |
| 287 |
Find the Duplicate Number |
46% |
Medium |
❤ |
| 289 |
Game of Life |
41% |
Medium |
❤ |
| 292 |
Nim Game |
55% |
Easy |
❤ |
| 295 |
Find Median from Data Stream |
33% |
Hard |
❤ |
| 300 |
Longest Increasing Subsequence |
39% |
Medium |
❤ |
| 301 |
Remove Invalid Parentheses |
37% |
Hard |
❤ |
| 309 |
Best Time to Buy and Sell Stock with Cooldown |
42% |
Medium |
❤ |
| 312 |
Burst Balloons |
45% |
Hard |
❤ |
| 313 |
Super Ugly Number |
39% |
Medium |
❤ |
| 315 |
Count of Smaller Numbers After Self |
36% |
Hard |
❤ |
| 316 |
Remove Duplicate Letters |
31% |
Hard |
❤ |
| 318 |
Maximum Product of Word Lengths |
47% |
Medium |
❤ |
| 319 |
Bulb Switcher |
43% |
Medium |
❤ |
| 321 |
Create Maximum Number |
24% |
Hard |
❤ |
| 322 |
Coin Change |
27% |
Medium |
❤ |
| 326 |
Power of Three |
41% |
Easy |
❤ |
| 327 |
Count of Range Sum |
31% |
Hard |
❤ |
| 328 |
Odd Even Linked List |
47% |
Medium |
❤ |
| 329 |
Longest Increasing Path in a Matrix |
38% |
Hard |
❤ |
| 331 |
Verify Preorder Serialization of a Binary Tree |
37% |
Medium |
❤ |
| 332 |
Reconstruct Itinerary |
30% |
Medium |
❤ |
| 334 |
Increasing Triplet Subsequence |
39% |
Medium |
❤ |
| 336 |
Palindrome Pairs |
28% |
Hard |
❤ |
| 337 |
House Robber III |
46% |
Medium |
❤ |
| 350 |
Intersection of Two Arrays II |
45% |
Easy |
❤ |
| 354 |
Russian Doll Envelopes |
33% |
Hard |
❤ |
| 355 |
Design Twitter |
26% |
Medium |
❤ |
| 357 |
Count Numbers with Unique Digits |
46% |
Medium |
❤ |
| 363 |
Max Sum of Rectangle No Larger Than K |
34% |
Hard |
❤ |
| 365 |
Water and Jug Problem |
28% |
Medium |
❤ |
| 368 |
Largest Divisible Subset |
34% |
Medium |
❤ |
| 371 |
Sum of Two Integers |
51% |
Easy |
❤ |
| 373 |
Find K Pairs with Smallest Sums |
32% |
Medium |
❤ |
| 376 |
Wiggle Subsequence |
36% |
Medium |
❤ |
| 378 |
Kth Smallest Element in a Sorted Matrix |
47% |
Medium |
❤ |
| 380 |
Insert Delete GetRandom O(1) |
41% |
Medium |
❤ |
| 381 |
Insert Delete GetRandom O(1) - Duplicates allowed |
30% |
Hard |
❤ |
| 384 |
Shuffle an Array |
48% |
Medium |
❤ |
| 385 |
Mini Parser |
31% |
Medium |
❤ |
| 390 |
Elimination Game |
42% |
Medium |
❤ |
| 392 |
Is Subsequence |
45% |
Medium |
❤ |
| 393 |
UTF-8 Validation |
35% |
Medium |
❤ |
| 396 |
Rotate Function |
34% |
Medium |
❤ |
| 397 |
Integer Replacement |
30% |
Medium |
❤ |
| 399 |
Evaluate Division |
45% |
Medium |
❤ |
| 400 |
Nth Digit |
29% |
Easy |
❤ |
| 402 |
Remove K Digits |
25% |
Medium |
❤ |
| 403 |
Frog Jump |
34% |
Hard |
❤ |
| 406 |
Queue Reconstruction by Height |
57% |
Medium |
❤ |
| 416 |
Partition Equal Subset Sum |
39% |
Medium |
❤ |
| 420 |
Strong Password Checker |
18% |
Hard |
❤ |
| 421 |
Maximum XOR of Two Numbers in an Array |
49% |
Medium |
❤ |
| 424 |
Longest Repeating Character Replacement |
43% |
Medium |
❤ |
| 432 |
All O`one Data Structure |
28% |
Hard |
❤ |
| 435 |
Non-overlapping Intervals |
41% |
Medium |
❤ |
| 437 |
Path Sum III |
41% |
Easy |
❤ |
| 440 |
K-th Smallest in Lexicographical Order |
25% |
Hard |
❤ |
| 443 |
String Compression |
35% |
Easy |
❤ |
| 445 |
Add Two Numbers II |
48% |
Medium |
❤ |
| 446 |
Arithmetic Slices II - Subsequence |
28% |
Hard |
❤ |
| 450 |
Delete Node in a BST |
38% |
Medium |
❤ |
| 456 |
132 Pattern |
27% |
Medium |
❤ |
| 459 |
Repeated Substring Pattern |
38% |
Easy |
❤ |
| 464 |
Can I Win |
26% |
Medium |
❤ |
| 466 |
Count The Repetitions |
27% |
Hard |
❤ |
| 467 |
Unique Substrings in Wraparound String |
33% |
Medium |
❤ |
| 470 |
Implement Rand10() Using Rand7() |
43% |
Medium |
❤ |
| 473 |
Matchsticks to Square |
35% |
Medium |
❤ |
| 477 |
Total Hamming Distance |
48% |
Medium |
❤ |
| 480 |
Sliding Window Median |
30% |
Hard |
❤ |
| 483 |
Smallest Good Base |
33% |
Hard |
❤ |
| 488 |
Zuma Game |
36% |
Hard |
❤ |
| 491 |
Increasing Subsequences |
40% |
Medium |
❤ |
| 492 |
Construct the Rectangle |
47% |
Easy |
❤ |
| 494 |
Target Sum |
44% |
Medium |
❤ |
| 501 |
Find Mode in Binary Search Tree |
38% |
Easy |
❤ |
| 503 |
Next Greater Element II |
49% |
Medium |
❤ |
| 516 |
Longest Palindromic Subsequence |
44% |
Medium |
❤ |
| 517 |
Super Washing Machines |
36% |
Hard |
❤ |
| 518 |
Coin Change 2 |
39% |
Medium |
❤ |
| 523 |
Continuous Subarray Sum |
23% |
Medium |
❤ |
| 525 |
Contiguous Array |
42% |
Medium |
❤ |
| 526 |
Beautiful Arrangement |
53% |
Medium |
❤ |
| 530 |
Minimum Absolute Difference in BST |
48% |
Easy |
❤ |
| 542 |
01 Matrix |
33% |
Medium |
❤ |
| 546 |
Remove Boxes |
36% |
Hard |
❤ |
| 547 |
Friend Circles |
51% |
Medium |
❤ |
| 552 |
Student Attendance Record II |
31% |
Hard |
❤ |
| 560 |
Subarray Sum Equals K |
40% |
Medium |
❤ |
| 572 |
Subtree of Another Tree |
40% |
Easy |
❤ |
| 576 |
Out of Boundary Paths |
30% |
Medium |
❤ |
| 581 |
Shortest Unsorted Continuous Subarray |
29% |
Easy |
❤ |
| 583 |
Delete Operation for Two Strings |
44% |
Medium |
❤ |
| 587 |
Erect the Fence |
33% |
Hard |
❤ |
| 591 |
Tag Validator |
31% |
Hard |
❤ |
| 600 |
Non-negative Integers without Consecutive Ones |
32% |
Hard |
❤ |
| 605 |
Can Place Flowers |
30% |
Easy |
❤ |
| 611 |
Valid Triangle Number |
43% |
Medium |
❤ |
| 621 |
Task Scheduler |
43% |
Medium |
❤ |
| 628 |
Maximum Product of Three Numbers |
45% |
Easy |
❤ |
| 630 |
Course Schedule III |
30% |
Hard |
❤ |
| 636 |
Exclusive Time of Functions |
46% |
Medium |
❤ |
| 638 |
Shopping Offers |
46% |
Medium |
❤ |
| 641 |
Design Circular Deque |
48% |
Medium |
❤ |
| 645 |
Set Mismatch |
40% |
Easy |
❤ |
| 647 |
Palindromic Substrings |
54% |
Medium |
❤ |
| 649 |
Dota2 Senate |
36% |
Medium |
❤ |
| 654 |
Maximum Binary Tree |
71% |
Medium |
❤ |
| 658 |
Find K Closest Elements |
35% |
Medium |
❤ |
| 659 |
Split Array into Consecutive Subsequences |
38% |
Medium |
❤ |
| 664 |
Strange Printer |
35% |
Hard |
❤ |
| 670 |
Maximum Swap |
39% |
Medium |
❤ |
| 673 |
Number of Longest Increasing Subsequence |
32% |
Medium |
❤ |
| 675 |
Cut Off Trees for Golf Event |
28% |
Hard |
❤ |
| 677 |
Map Sum Pairs |
50% |
Medium |
❤ |
| 678 |
Valid Parenthesis String |
30% |
Medium |
❤ |
| 679 |
24 Game |
40% |
Hard |
❤ |
| 685 |
Redundant Connection II |
29% |
Hard |
❤ |
| 686 |
Repeated String Match |
31% |
Easy |
❤ |
| 691 |
Stickers to Spell Word |
36% |
Hard |
❤ |
| 695 |
Max Area of Island |
54% |
Medium |
❤ |
| 698 |
Partition to K Equal Sum Subsets |
39% |
Medium |
❤ |
| 707 |
Design Linked List |
19% |
Easy |
❤ |
| 710 |
Random Pick with Blacklist |
30% |
Hard |
❤ |
| 712 |
Minimum ASCII Delete Sum for Two Strings |
52% |
Medium |
❤ |
| 713 |
Subarray Product Less Than K |
34% |
Medium |
❤ |
| 714 |
Best Time to Buy and Sell Stock with Transaction Fee |
48% |
Medium |
❤ |
| 718 |
Maximum Length of Repeated Subarray |
43% |
Medium |
❤ |
| 719 |
Find K-th Smallest Pair Distance |
28% |
Hard |
❤ |
| 721 |
Accounts Merge |
37% |
Medium |
❤ |
| 722 |
Remove Comments |
29% |
Medium |
❤ |
| 726 |
Number of Atoms |
43% |
Hard |
❤ |
| 730 |
Count Different Palindromic Subsequences |
37% |
Hard |
❤ |
| 731 |
My Calendar II |
41% |
Medium |
❤ |
| 736 |
Parse Lisp Expression |
42% |
Hard |
❤ |
| 739 |
Daily Temperatures |
56% |
Medium |
❤ |
| 740 |
Delete and Earn |
44% |
Medium |
❤ |
| 752 |
Open the Lock |
42% |
Medium |
❤ |
| 753 |
Cracking the Safe |
43% |
Hard |
❤ |
| 754 |
Reach a Number |
30% |
Easy |
❤ |
| 756 |
Pyramid Transition Matrix |
48% |
Medium |
❤ |
| 770 |
Basic Calculator IV |
42% |
Hard |
❤ |
| 784 |
Letter Case Permutation |
53% |
Easy |
❤ |
| 785 |
Is Graph Bipartite? |
41% |
Medium |
❤ |
| 786 |
K-th Smallest Prime Fraction |
35% |
Hard |
❤ |
| 787 |
Cheapest Flights Within K Stops |
32% |
Medium |
❤ |
| 790 |
Domino and Tromino Tiling |
34% |
Medium |
❤ |
| 792 |
Number of Matching Subsequences |
39% |
Medium |
❤ |
| 793 |
Preimage Size of Factorial Zeroes Function |
39% |
Hard |
❤ |
| 795 |
Number of Subarrays with Bounded Maximum |
41% |
Medium |
❤ |
| 798 |
Smallest Rotation with Highest Score |
37% |
Hard |
❤ |
| 799 |
Champagne Tower |
31% |
Medium |
❤ |
| 801 |
Minimum Swaps To Make Sequences Increasing |
32% |
Medium |
❤ |
| 802 |
Find Eventual Safe States |
41% |
Medium |
❤ |
| 803 |
Bricks Falling When Hit |
25% |
Hard |
❤ |
| 805 |
Split Array With Same Average |
22% |
Hard |
❤ |
| 810 |
Chalkboard XOR Game |
42% |
Hard |
❤ |
| 813 |
Largest Sum of Averages |
42% |
Medium |
❤ |
| 815 |
Bus Routes |
36% |
Hard |
❤ |
| 818 |
Race Car |
32% |
Hard |
❤ |
| 820 |
Short Encoding of Words |
44% |
Medium |
❤ |
| 826 |
Most Profit Assigning Work |
33% |
Medium |
❤ |
| 827 |
Making A Large Island |
40% |
Hard |
❤ |
| 828 |
Unique Letter String |
36% |
Hard |
❤ |
| 829 |
Consecutive Numbers Sum |
30% |
Hard |
❤ |
| 834 |
Sum of Distances in Tree |
35% |
Hard |
❤ |
| 837 |
New 21 Game |
27% |
Medium |
❤ |
| 838 |
Push Dominoes |
41% |
Medium |
❤ |
| 839 |
Similar String Groups |
32% |
Hard |
❤ |
| 843 |
Guess the Word |
39% |
Hard |
❤ |
| 846 |
Hand of Straights |
46% |
Medium |
❤ |
| 847 |
Shortest Path Visiting All Nodes |
43% |
Hard |
❤ |
| 849 |
Maximize Distance to Closest Person |
39% |
Easy |
❤ |
| 850 |
Rectangle Area II |
41% |
Hard |
❤ |
| 851 |
Loud and Rich |
45% |
Medium |
❤ |
| 852 |
Peak Index in a Mountain Array |
67% |
Easy |
❤ |
| 854 |
K-Similar Strings |
31% |
Hard |
❤ |
| 857 |
Minimum Cost to Hire K Workers |
45% |
Hard |
❤ |
| 862 |
Shortest Subarray with Sum at Least K |
20% |
Hard |
❤ |
| 863 |
All Nodes Distance K in Binary Tree |
43% |
Medium |
❤ |
| 864 |
Shortest Path to Get All Keys |
33% |
Hard |
❤ |
| 866 |
Prime Palindrome |
18% |
Medium |
❤ |
| 879 |
Profitable Schemes |
34% |
Hard |
❤ |
| 895 |
Maximum Frequency Stack |
48% |
Hard |
❤ |
| 896 |
Monotonic Array |
54% |
Easy |
❤ |
| 897 |
Increasing Order Search Tree |
59% |
Easy |
❤ |
| 898 |
Bitwise ORs of Subarrays |
31% |
Medium |
❤ |
| 901 |
Online Stock Span |
44% |
Medium |
❤ |
| 903 |
Valid Permutations for DI Sequence |
39% |
Hard |
❤ |
| 904 |
Fruit Into Baskets |
40% |
Medium |
❤ |
| 907 |
Sum of Subarray Minimums |
22% |
Medium |
❤ |
| 909 |
Snakes and Ladders |
26% |
Medium |
❤ |
| 910 |
Smallest Range II |
20% |
Medium |
❤ |
| 911 |
Online Election |
43% |
Medium |
❤ |
| 913 |
Cat and Mouse |
23% |
Hard |
❤ |
| 915 |
Partition Array into Disjoint Intervals |
40% |
Medium |
❤ |
| 918 |
Maximum Sum Circular Subarray |
26% |
Medium |
❤ |
| 919 |
Complete Binary Tree Inserter |
54% |
Medium |
❤ |
| 921 |
Minimum Add to Make Parentheses Valid |
68% |
Medium |
❤ |