Leetcode Solutions

The following table contains the problems with solutions:

Problem	Category	Solution
492. Construct the Rectangle	Adhoc	Solution
806. Number of Lines To Write String	Adhoc	Solution
2544. Alternating Digit Sum	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
2460. Apply Operations to an Array	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
338. Counting Bits	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
13. Roman to Integer	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
1512. Number of Good Pairs	Hash Table	Solution
1539. Kth Missing Positive Number	Hash Table	Solution
2062. Count Vowel Substrings of a String	Hash Table	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
2481. Minimum Cuts to Divide a Circle	Math	Solution
2485. Find the Pivot Integer	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
2545. Sort the Students by Their Kth Score	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
14. Longest Common Prefix	String	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
1704. Determine if String Halves Are Alike	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
2546. Apply Bitwise Operations to Make Strings Equal	String	Solution
94. Binary Tree Inorder Traversal	Tree	Solution
102. Binary Tree Level Order Traversal	Tree	Solution
104. Maximum Depth of Binary Tree	Tree	Solution
111. Minimum Depth of Binary Tree	Tree	Solution
144. Binary Tree Preorder Traversal	Tree	Solution
145. Binary Tree Postorder 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
701. Insert into a Binary Search Tree	Tree	Solution
938. Range Sum of BST	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