| * 767 |
Reorganize String |
Java |
Medium |
| 68 |
Text Justification |
Java |
Hard |
| * 97 |
Interleaving String |
Java |
Medium |
| * 646 |
Maximum Length of Pair Chain |
Java |
Medium |
| * 403 |
Frog Jump |
Java |
Hard |
| 225 |
Implement Stack using Queues |
Java |
Easy |
| 2483 |
Minimum Penalty for a Shop |
Java |
Medium |
| * 2366 |
Minimum Replacements to Sort the Array |
Java |
Hard |
| 32 |
Longest Valid Parentheses |
Java |
Hard |
| 1 |
Two Sum |
Java |
Easy |
| 27 |
Remove Element |
Java |
Easy |
| 200 |
Number of Islands |
Java |
Medium |
| *1326 |
Minimum Number of Taps to Open to Water a Garden |
Java |
Hard |
| 3 |
Longest Substring Without Repeating Characters |
Java |
Medium |
| 35 |
Search Insert Position |
Java |
Easy |
| 338 |
Counting Bits |
Java |
Easy |
| * 33 |
Search in Rotated Sorted Array |
Java |
Medium |
| 74 |
Search a 2D Matrix |
Java |
Medium |
| * 15 |
3Sum |
Java |
Medium |
| * 2707 |
Extra Characters in a String |
Java |
Medium |
| 62 |
Unique Paths |
Java |
Medium |
| 141 |
Linked List Cycle |
Java |
Easy |
| 139 |
Word Break |
Java |
Medium |
| 215 |
Kth Largest Element in an Array |
Java |
Medium |
| 1796 |
Second Largest Digit in a String |
Java |
Easy |
| 138 |
Copy List with Random Pointer |
Java |
Medium |
| 725 |
Split Linked List in Parts |
Java |
Medium |
| 605 |
Can Place Flowers |
Java |
Easy |
| * 81 |
Search in Rotated Sorted Array II |
Java |
Medium |
| 92 |
Reverse Linked List II |
Java |
Medium |
| 118 |
Pascal's Triangle |
Java |
Easy |
| 1833 |
Maximum Ice Cream Bars |
Java |
Medium |
| * 1359 |
Count All Valid Pickup and Delivery Options |
Java |
Hard |
| 1282 |
Group the People Given the Group Size They Belong To |
Java |
Medium |
| 88 |
Merge Sorted Array |
Java |
Easy |
| 26 |
Remove Duplicates from Sorted Array |
Java |
Easy |
| 80 |
Remove Duplicates from Sorted Array II |
Java |
Medium |
| 1647 |
Minimum Deletions to Make Character Frequencies Unique |
Java |
Medium |
| 169 |
Majority Element |
Java |
Easy |
| 189 |
Rotate Array |
Java |
Medium |
| 135 |
Candy |
Java |
Hard |
| * 121 |
Best Time to Buy and Sell Stock |
Java |
Easy |
| 122 |
Best Time to Buy and Sell Stock II |
Java |
Medium |
| * 332 |
Reconstruct Itinerary |
Java |
Hard |
| 55 |
Jump Game |
Java |
Medium |
| 45 |
Jump Game II |
Java |
Medium |
| * 45 |
Min Cost to Connect All Points |
Java |
Medium |
| 274 |
H-Index |
Java |
Medium |
| 380 |
Insert Delete GetRandom O(1) |
Java |
Medium |
| 1631 |
Path With Minimum Effort |
Java |
Medium |
| 14 |
Longest Common Prefix |
Java |
Easy |
| 28 |
Find the Index of the First Occurrence in a String |
Java |
Easy |
| 1337 |
The K Weakest Rows in a Matrix |
Java |
Easy |
| 287 |
Find the Duplicate Number |
Java |
Medium |
| * 1658 |
Minimum Operations to Reduce X to Zero |
Java |
Medium |
| 238 |
Product of Array Except Self |
Java |
Medium |
| 4 |
Median of Two Sorted Arrays |
Java |
Hard |
| 392 |
Is Subsequence |
Java |
Easy |
| 58 |
Length of Last Word |
Java |
Easy |
| 1048 |
Longest String Chain |
Java |
Medium |
| * 799 |
Champagne Tower |
Java |
Medium |
| 111 |
Minimum Depth of Binary Tree |
Java |
Easy |
| 389 |
Find the Difference |
Java |
Easy |
| * 316 |
Remove Duplicate Letters |
Java |
Medium |
| 69 |
Sqrt(x) |
Java |
Easy |
| 94 |
Binary Tree Inorder Traversal |
Java |
Easy |
| 160 |
Intersection of Two Linked Lists |
Java |
Easy |
| 171 |
Excel Sheet Column Number |
Java |
Easy |
| 202 |
Happy Number |
Java |
Easy |
| * 880 |
Decoded String at Index |
Java |
Medium |
| 67 |
Add Binary |
Java |
Easy |
| 83 |
Remove Duplicates from Sorted List |
Java |
Easy |
| 100 |
Same Tree |
Java |
Easy |
| 110 |
Balanced Binary Tree |
Java |
Easy |
| 905 |
Sort Array By Parity |
Java |
Easy |
| 112 |
Path Sum |
Java |
Easy |
| 896 |
Monotonic Array |
Java |
Easy |
| 119 |
Pascal's Triangle II |
Java |
Easy |
| * 456 |
Pattern |
Java |
Medium |
| 557 |
Reverse Words in a String III |
Java |
Easy |
| 2038 |
Remove Colored Pieces if Both Neighbors are the Same Color |
Java |
Medium |
| 144 |
Binary Tree Preorder Traversal |
Java |
Easy |
| 1512 |
Number of Good Pairs |
Java |
Easy |
| 145 |
Binary Tree Postorder Traversal |
Java |
Easy |
| 706 |
Design HashMap |
Java |
Easy |
| 229 |
Majority Element II |
Java |
Medium |
| 343 |
Integer Break |
Java |
Medium |
| 203 |
Remove Linked List Elements |
Java |
Easy |
| 205 |
Isomorphic Strings |
Java |
Easy |
| * 1420 |
Build Array Where You Can Find The Maximum Exactly K Comparisons |
Java |
Hard |
| 219 |
Contains Duplicate II |
Java |
Easy |
| 222 |
Count Complete Tree Nodes |
Java |
Easy |
| 228 |
Summary Ranges |
Java |
Easy |
| * 1458 |
Max Dot Product of Two Subsequences |
Java |
Hard |
| 231 |
Power of Two |
Java |
Easy |
| 226 |
Invert Binary Tree |
Java |
Easy |
| 232 |
Implement Queue using Stacks |
Java |
Easy |
| 34 |
Find First and Last Position of Element in Sorted Array |
Java |
Medium |
| * 257 |
Binary Tree Paths |
Java |
Easy |
| * 258 |
Add Digits |
Java |
Easy |
| * 263 |
Ugly Number |
Java |
Easy |
| 290 |
Word Pattern |
Java |
Easy |
| * 2009 |
Minimum Number of Operations to Make Array Continuous |
Java |
Hard |
| 292 |
Nim Game |
Java |
Easy |
| * 2251 |
Number of Flowers in Full Bloom |
Java |
Hard |
| 303 |
Range Sum Query Immutable |
Java |
Easy |
| 1095 |
Find in Mountain Array |
Java |
Hard |
| 746 |
Min Cost Climbing Stairs |
Java |
Easy |
| * 2742 |
Painting the Walls |
Java |
Hard |
| * 342 |
Power of Four |
Java |
Easy |
| 345 |
Reverse Vowels of a String |
Java |
Easy |
| * 1269 |
Number of Ways to Stay in the Same Place After Some Steps |
Java |
Hard |
| 349 |
Intersection of Two Arrays |
Java |
Easy |
| 367 |
Valid Perfect Square |
Java |
Easy |
| 374 |
Guess Number Higher or Lower |
Java |
Easy |
| * 401 |
Binary Watch |
Java |
Easy |
| 404 |
Sum of Left Leaves |
Java |
Easy |
| 405 |
Convert a Number to Hexadecimal |
Java |
Easy |
| 409 |
Longest Palindrome |
Java |
Easy |
| 414 |
Third Maximum Number |
Java |
Easy |
| 415 |
Add Strings |
Java |
Easy |
| * 1361 |
Validate Binary Tree Nodes |
Java |
Medium |
| 434 |
Number of Segments in a String |
Java |
Easy |
| * 2050 |
Parallel Courses III |
Java |
Hard |
| 1662 |
Check If Two String Arrays are Equivalent |
Java |
Easy |
| 844 |
Backspace String Compare |
Java |
Easy |
| 441 |
Arranging Coins |
Java |
Easy |
| 448 |
Find All Numbers Disappeared in an Array |
Java |
Easy |
| * 341 |
Flatten Nested List Iterator |
Java |
Medium |
| * 1425 |
Constrained Subsequence Sum |
Java |
Hard |
| * 1793 |
Maximum Score of a Good Subarray |
Java |
Hard |
| 455 |
Assign Cookies |
Java |
Easy |
| 463 |
Island Perimeter |
Java |
Easy |
| 515 |
Find Largest Value in Each Tree Row |
Java |
Medium |
| 476 |
Number Complement |
Java |
Easy |
| 779 |
K-th Symbol in Grammar |
Java |
Medium |
| 482 |
License Key Formatting |
Java |
Easy |
| * 5 |
Longest Palindromic Substring |
Java |
Medium |
| 1356 |
Sort Integers by The Number of 1 Bits |
Java |
Easy |
| 2433 |
Find The Original Array of Prefix Xor |
Java |
Medium |