| 492. Construct the Rectangle |
Adhoc |
Solution |
| 806. Number of Lines To Write String |
Adhoc |
Solution |
| 48. Rotate Image |
Array |
Solution |
| 66. Plus One |
Array |
Solution |
| 189. Rotate Array |
Array |
Solution |
| 283. Move Zeroes |
Array |
Solution |
| 414. Third Maximum Number |
Array |
Solution |
| 448. Find All Numbers Disappeared in an Array |
Array |
Solution |
| 485. Max Consecutive Ones |
Array |
Solution |
| 509. Fibonacci Number |
Array |
Solution |
| 643. Maximum Average Subarray I |
Array |
Solution |
| 832. Flipping an Image |
Array |
Solution |
| 867. Transpose Matrix |
Array |
Solution |
| 896. Monotonic Array |
Array |
Solution |
| 905. Sort Array By Parity |
Array |
Solution |
| 922. Sort Array By Parity II |
Array |
Solution |
| 941. Valid Mountain Array |
Array |
Solution |
| 985. Sum of Even Numbers After Queries |
Array |
Solution |
| 999. Available Captures for Rook |
Array |
Solution |
| 1051. Height Checker |
Array |
Solution |
| 1089. Duplicate Zeros |
Array |
Solution |
| 1200. Minimum Absolute Difference |
Array |
Solution |
| 1252. Cells with Odd Values in a Matrix |
Array |
Solution |
| 1295. Find Numbers with Even Number of Digits |
Array |
Solution |
| 1299. Replace Elements with Greatest Element on Right Side |
Array |
Solution |
| 1313. Decompress Run-Length Encoded List |
Array |
Solution |
| 1331. Rank Transform of an Array |
Array |
Solution |
| 1337. The K Weakest Rows in a Matrix |
Array |
Solution |
| 1346. Check If N and Its Double Exist |
Array |
Solution |
| 1351. Count Negative Numbers in a Sorted Matrix |
Array |
Solution |
| 1385. Find the Distance Value Between Two Arrays |
Array |
Solution |
| 1431. Kids With the Greatest Number of Candies |
Array |
Solution |
| 1450. Number of Students Doing Homework at a Given Time |
Array |
Solution |
| 1470. Shuffle the Array |
Array |
Solution |
| 1476. Subrectangle Queries |
Array |
Solution |
| 1480. Running Sum of 1d Array |
Array |
Solution |
| 1534. Count Good Triplets |
Array |
Solution |
| 1629. Slowest Key |
Array |
Solution |
| 1672. Richest Customer Wealth |
Array |
Solution |
| 1732. Find the Highest Altitude |
Array |
Solution |
| 1742. Maximum Number of Balls in a Box |
Array |
Solution |
| 1752. Check if Array Is Sorted and Rotated |
Array |
Solution |
| 1773. Count Items Matching a Rule |
Array |
Solution |
| 1833. Maximum Ice Cream Bars |
Array |
Solution |
| 1863. Sum of All Subset XOR Totals |
Backtracking |
Solution |
| 275. H-Index II |
Binary Search |
Solution |
| 278. First Bad Version |
Binary Search |
Solution |
| 367. Valid Perfect Square |
Binary Search |
Solution |
| 374. Guess Number Higher or Lower |
Binary Search |
Solution |
| 441. Arranging Coins |
Binary Search |
Solution |
| 540. Single Element in a Sorted Array |
Binary Search |
Solution |
| 704. Binary Search |
Binary Search |
Solution |
| 852. Peak Index in a Mountain Array |
Binary Search |
Solution |
| 342. Power of Four |
Bit Manipulation |
Solution |
| 1720. Decode XORed Array |
Bit Manipulation |
Solution |
| 225. Implement Stack using Queues |
Design |
Solution |
| 232. Implement Queue using Stacks |
Design |
Solution |
| 707. Design Linked List |
Design |
Solution |
| 1286. Iterator for Combination |
Design |
Solution |
| 1381. Design a Stack With Increment Operation |
Design |
Solution |
| 1603. Design Parking System |
Design |
Solution |
| 215. Kth Largest Element in an Array |
Divide and Conquer |
Solution |
| 53. Maximum Subarray |
Dynamic Programming |
Solution |
| 70. Climbing Stairs |
Dynamic Programming |
Solution |
| 121. Best Time to Buy and Sell Stock |
Dynamic Programming |
Solution |
| 746. Min Cost Climbing Stairs |
Dynamic Programming |
Solution |
| 785. Is Graph Bipartite? |
Graph |
Solution |
| 997. Find the Town Judge |
Graph |
Solution |
| 455. Assign Cookies |
Greedy |
Solution |
| 944. Delete Columns to Make Sorted |
Greedy |
Solution |
| 1282. Group the People Given the Group Size They Belong To |
Greedy |
Solution |
| 1518. Water Bottles |
Greedy |
Solution |
| 1710. Maximum Units on a Truck |
Greedy |
Solution |
| 1716. Calculate Money in Leetcode Bank |
Greedy |
Solution |
| 1725. Number Of Rectangles That Can Form The Largest Square |
Greedy |
Solution |
| 1736. Latest Time by Replacing Hidden Digits |
Greedy |
Solution |
| 1774. Closest Dessert Cost |
Greedy |
Solution |
| 1. Two Sum |
Hash Table |
Solution |
| 36. Valid Sudoku |
Hash Table |
Solution |
| 136. Single Number |
Hash Table |
Solution |
| 169. Majority Element |
Hash Table |
Solution |
| 202. Happy Number |
Hash Table |
Solution |
| 242. Valid Anagram |
Hash Table |
Solution |
| 350. Intersection of Two Arrays II |
Hash Table |
Solution |
| 387. First Unique Character in a String |
Hash Table |
Solution |
| 409. Longest Palindrome |
Hash Table |
Solution |
| 705. Design HashSet |
Hash Table |
Solution |
| 748. Shortest Completing Word |
Hash Table |
Solution |
| 771. Jewels and Stones |
Hash Table |
Solution |
| 811. Subdomain Visit Count |
Hash Table |
Solution |
| 884. Uncommon Words from Two Sentences |
Hash Table |
Solution |
| 961. N-Repeated Element in Size 2N Array |
Hash Table |
Solution |
| 1002. Find Common Characters |
Hash Table |
Solution |
| 1160. Find Words That Can Be Formed by Characters |
Hash Table |
Solution |
| 1189. Maximum Number of Balloons |
Hash Table |
Solution |
| 1207. Unique Number of Occurrences |
Hash Table |
Solution |
| 1365. How Many Numbers Are Smaller Than the Current Number |
Hash Table |
Solution |
| 1539. Kth Missing Positive Number |
Hash Table |
Solution |
| 1512. Number of Good Pairs |
HashTable |
Solution |
| 850. Rectangle Area II |
Line Sweep |
Solution |
| 21. Merge Two Sorted Lists |
Linked List |
Solution |
| 83. Remove Duplicates from Sorted List |
Linked List |
Solution |
| 876. Middle of the Linked List |
Linked List |
Solution |
| 1290. Convert Binary Number in a Linked List to Integer |
Linked List |
Solution |
| 7. Reverse Integer |
Math |
Solution |
| 223. Rectangle Area |
Math |
Solution |
| 263. Ugly Number |
Math |
Solution |
| 507. Perfect Number |
Math |
Solution |
| 728. Self Dividing Numbers |
Math |
Solution |
| 812. Largest Triangle Area |
Math |
Solution |
| 836. Rectangle Overlap |
Math |
Solution |
| 942. DI String Match |
Math |
Solution |
| 970. Powerful Integers |
Math |
Solution |
| 976. Largest Perimeter Triangle |
Math |
Solution |
| 1232. Check If It Is a Straight Line |
Math |
Solution |
| 1281. Subtract the Product and Sum of Digits of an Integer |
Math |
Solution |
| 1317. Convert Integer to the Sum of Two No-Zero Integers |
Math |
Solution |
| 1323. Maximum 69 Number |
Math |
Solution |
| 1523. Count Odd Numbers in an Interval Range |
Math |
Solution |
| 933. Number of Recent Calls |
Queue |
Solution |
| 176. Second Highest Salary |
SQL |
Solution |
| 182. Duplicate Emails |
SQL |
Solution |
| 274. H-Index |
Sort |
Solution |
| 969. Pancake Sorting |
Sort |
Solution |
| 973. K Closest Points to Origin |
Sort |
Solution |
| 977. Squares of a Sorted Array |
Sort |
Solution |
| 1122. Relative Sort Array |
Sort |
Solution |
| 1491. Average Salary Excluding the Minimum and Maximum Salary |
Sort |
Solution |
| 1528. Shuffle String |
Sort |
Solution |
| 20. Valid Parentheses |
Stack |
Solution |
| 155. Min Stack |
Stack |
Solution |
| 1021. Remove Outermost Parentheses |
Stack |
Solution |
| 1047. Remove All Adjacent Duplicates In String |
Stack |
Solution |
| 1441. Build an Array With Stack Operations |
Stack |
Solution |
| 125. Valid Palindrome |
String |
Solution |
| 520. Detect Capital |
String |
Solution |
| 551. Student Attendance Record I |
String |
Solution |
| 709. To Lower Case |
String |
Solution |
| 804. Unique Morse Code Words |
String |
Solution |
| 821. Shortest Distance to a Character |
String |
Solution |
| 929. Unique Email Addresses |
String |
Solution |
| 1108. Defanging an IP Address |
String |
Solution |
| 1170. Compare Strings by Frequency of the Smallest Character |
String |
Solution |
| 1436. Destination City |
String |
Solution |
| 1496. Path Crossing |
String |
Solution |
| 1525. Number of Good Ways to Split a String |
String |
Solution |
| 1624. Largest Substring Between Two Equal Characters |
String |
Solution |
| 1768. Merge Strings Alternately |
String |
Solution |
| 1790. Check if One String Swap Can Make Strings Equal |
String |
Solution |
| 1967. Number of Strings That Appear as Substrings in Word |
String |
Solution |
| 2011. Final Value of Variable After Performing Operations |
String |
Solution |
| 102. Binary Tree Level Order Traversal |
Tree |
Solution |
| 590. N-ary Tree Postorder Traversal |
Tree |
Solution |
| 617. Merge Two Binary Trees |
Tree |
Solution |
| 637. Average of Levels in Binary Tree |
Tree |
Solution |
| 700. Search in a Binary Search Tree |
Tree |
Solution |
| 965. Univalued Binary Tree |
Tree |
Solution |
| 11. Container With Most Water |
Two Pointers |
Solution |
| 26. Remove Duplicates from Sorted Array |
Two Pointers |
Solution |
| 27. Remove Element |
Two Pointers |
Solution |
| 88. Merge Sorted Array |
Two Pointers |
Solution |
| 344. Reverse String |
Two Pointers |
Solution |