Leetcode Algorithms

Problems

# Number	Name	Difficulty	Solution
1	Two Sum	Easy
7	Reverse Integer	Easy
9	PalindromeNumber	Easy
13	Roman To Integer	Easy
14	Longest Common Prefix	Easy
20	ValidParentheses	Easy
21	Merge 2 Sorted Lists	Easy
26	Remove Duplicates From Sorted Array	Easy
27	Remove Element	Easy
28	Needle in Haystack	Easy
35	Search Inserted Position	Easy
38	Count and Say	Easy
53	Maximum SubArray	Easy
58	Length of Last Word	Easy
66	Plus One	Easy
67	Add Binary	Easy
69	Sqrt(x)	Easy
70	Climbing Stairs	Easy
83	Remove Duplicates from Sorted List	Easy
88	Merge Sorted Array	Easy
100	Same Tree	Easy
101	Symmetric Tree	Easy
104	Maximum Depth of Binary Tree	Easy
107	Binary Tree Level Order Traversal II	Easy
108	Convert Sorted Array To Binary Search Tree	Easy
110	Balanced Binary Tree	Easy
111	Minimum Depth of Binary Tree	Easy
112	Path Sum	Easy
118	Pascal's Triangle	Easy
119	Pascal's Triangle II	Easy
121	Best Time to Buy and Sell Stocks	Easy
122	Best Time to Buy and Sell Stocks II	Easy
125	Valid Palindrome	Easy
136	Single Number	Easy
141	Linked List Cycle	Easy
155	Min Stack	Easy
157	Read N Characters Given Read4	Easy
160	Intersection of Two Linked Lists	Easy
167	Two Sum II - Input Array is Sorted	Easy
168	Excel Sheet Column Title	Easy
169	Majority Element	Easy
170	Two Sum III - Data Structure Design	Easy
171	Excel Sheet Column Number	Easy
172	Factoring Trailing Zeroes	Easy
189	Rotate Array	Easy
190	Reverse Bits	Easy
191	Number of One Bits	Easy
198	House Robber	Easy
202	Happy Number	Easy
203	Remove Linked List Elements	Easy
204	Count Primes	Easy
205	Isomorphic Strings	Easy
206	Reverse Linked Lists	Easy
217	Contains Duplicate	Easy
219	Contains Duplicate II	Easy
225	Implement Stack using Queues	Easy
226	Invert Binary Tree	Easy
231	Power of Two	Easy
232	Implement Queue Using Stacks	Easy
234	Palindrome Linked Lists	Easy
235	Lowest Common Ancestor of a Binary Search Tree	Easy
237	Delete a Node In A Linked List	Easy
242	Valid Anagram	Easy
243	Shortest Word Distance	Easy
246	Strobogramatic Number	Easy
252	Meeting Rooms	Easy
256	Paint House	Easy
257	Binary Tree Paths	Easy
258	Add Digits	Easy
263	Ugly Number	Easy
266	Palindrome Permutation	Easy
268	Missing Number	Easy
270	Closest Binary Search Tree Value	Easy
276	Paint Fence	Easy
278	First Bad Version	Easy
283	Move Zeroes	Easy
290	Word Pattern	Easy
292	Nim Game	Easy
293	Flip Game	Easy
299	Bulls and Cows	Easy
303	Range Sum Query - Immutable	Easy
326	Power of Three	Easy
339	Nested List Weight Sum	Easy
342	Power of Four	Easy
344	Reverse A String	Easy
345	Reverse Vowels of A String	Easy
346	Moving Average From Data Stream	Easy
349	Intersection of 2 Arrays	Easy
350	Intersection of 2 Arrays II	Easy
359	Logger Rate Limiter	Easy
367	Valid Perfect Square	Easy
374	Guess Number Higher or Lower	Easy
383	Ransom Note	Easy
387	First Unique Character in String	Easy
389	Find the Difference	Easy
392	Is Subsequence	Easy
401	Binary Watch	Easy
404	Sum of Left Leaves	Easy
405	Convert a Number to Hexadecimal	Easy
408	Valid Word Abbreviation	Easy
409	Longest Palindrome	Easy
412	Fizz Buzz	Easy
414	Third Maximum Number	Easy
415	Add Strings	Easy
422	Valid Word Square	Easy
434	Number of Segments in a String	Easy
441	Arranging Coins	Easy
443	String Compression	Easy
447	Number of Boomerangs	Easy
448	Find All Numbers Disappeared in an Array	Easy
453	Minimum Moves to Equal Array Elements	Easy
455	Assign Cookies	Easy
459	Repeated Substring Pattern	Easy
461	Hamming Distance	Easy
463	Island Perimeter	Easy
475	Heaters	Easy
476	Number Complement	Easy
482	License Key Formatting	Easy
485	Max Consecutive Ones	Easy
492	Construct the Rectangle	Easy
496	Next Greater Element I	Easy
500	Keyboard Row	Easy
501	Find Mode in Binary Search Tree	Easy
504	Base 7	Easy
506	Relative Ranks	Easy
507	Perfect Number	Easy
509	Fibonacci Number	Easy
520	Detect Capital	Easy
521	Longest Uncommon Subsequence I	Easy
530	Minimum Absolute Difference in BST	Easy
532	K - Diff Pairs in Array	Easy
538	Convert BST to Greater Tree	Easy
541	Reverse String II	Easy
543	Diameter of Binary Tree	Easy
551	Student Attendance Record I	Easy
557	Reverse Words in a String III	Easy
559	Maximum Depth of N-Ary Tree	Easy
561	Array Partition I	Easy
563	Binary Tree Tilt	Easy
566	Reshape The Matrix	Easy
572	Subtree of Another Tree	Easy
575	Distribute Candies	Easy
581	Shortest Unsorted Continuous Subarray	Easy
589	N-Ary Tree Preorder Traversal	Easy
590	N-Ary Tree Postorder Traversal	Easy
594	Longest Harmonious Subsequence	Easy
598	Range Addition II	Easy
599	Minimum Index Sum of 2 Lists	Easy
604	Design Compressed String Iterator	Easy
605	Can Place Flowers	Easy
606	Construct String from Binary Tree	Easy
617	Merge Two Binary Trees	Easy
624	Maximum Distance in Arrays	Easy
628	Maximum Product of Three Numbers	Easy
633	Sum Square Numbers	Easy
637	Average of Levels in Binary Tree	Easy
643	Maximum Average SubArray I	Easy
645	Set Mismatch	Easy
653	Two Sum IV - Input is a BST	Easy
657	Robot Return to Origin	Easy
661	Image Smoother	Easy
665	Non Deceasing Array	Easy
669	Trim a Binary Search Tree	Easy
671	Second Minimum Node in Binary Tree	Easy
674	Longest Continuous Increasing Subsequence	Easy
680	Valid Palindrome II	Easy
682	Baseball Game	Easy
686	Repeated String Match	Easy
687	Longest Univalue Path	Easy
690	Employee Importance	Easy
693	Binary Number with Alternating Bits	Easy
696	Count Binary Substrings	Easy
697	Degree of an Array	Easy
700	Search in a Binary Search Tree	Easy
703	Kth Largest Element in a Stream	Easy
704	Binary Search	Easy
705	Design HashSet	Easy
706	Design HashMap	Easy
709	To Lower Case	Easy
716	Max Stack	Easy
717	1-bit and 2-bit Characters	Easy
720	Longest Word in Dictionary	Easy
724	Find Pivot Index	Easy
728	Self Dividing Numbers	Easy
733	Flood Fill	Easy
734	Sentence Similarity	Easy
744	Find Smallest Letter Greater Than Target	Easy
746	Min Cost Climbing Stairs	Easy
747	Largest Number at least twize of Others	Easy
748	Shortest Completing Word	Easy
758	Bold Words in String	Easy
760	Find Anagram Mappings	Easy
762	Prime Number of Set Bits in Primary Representation	Easy
766	Toeplitz Matrix	Easy
771	Jewels and Stones	Easy
783	Minimum Distance Between BST Nodes	Easy
788	Rotated Digits	Easy
796	Rotate String	Easy
800	Similar RGB Color	Easy
804	Unique Morse Code Words	Easy
806	Number of Lines to Write String	Easy
811	Subdomain Visit Count	Easy
812	Largest Triangle Area	Easy
819	Most Common Word	Easy
821	Shortest Distance to Character	Easy
824	Goat Latin	Easy
830	Positions of Large Groups	Easy
832	Flipping an Image	Easy
836	Rectangle Overlap	Easy
840	Magic Squares in Grid	Easy
844	Backspace String Compare	Easy
849	Maximize Distance to Closest Person	Easy
852	Peak Index in Mountain Array	Easy
859	Buddy Strings	Easy
860	Lemonade Change	Easy
867	Transpose Matrix	Easy
868	Binary Gap	Easy
872	Leaf-Similar Trees	Easy
874	Walking Robot Simulation	Easy
876	Middle of the Linked List	Easy
883	Projection Area of 3D Shapes	Easy
884	Uncommon Words from 2 Sentences	Easy
888	Fair Candy Swap	Easy
892	Surface Area of 3D Shapes	Easy
893	Groups of Special Equivalent Strings	Easy
896	Monotonic Array	Easy
897	Increasing Order Search Tree	Easy
905	Sort Array by Parity	Easy
908	Smallest Range I	Easy
914	X of a kind in a Deck of Cards	Easy
917	Reverse Only Letters	Easy
922	Sort Array by Parity II	Easy
925	Long Pressed Name	Easy
929	Unique Email Addresses	Easy
933	Number of Recent Calls	Easy
937	Reorder Data In Log Files	Easy
938	Range Sum of BST	Easy
941	Valid Mountain Array	Easy
942	DI String Match	Easy
944	Delete Columns to Make Sorted	Easy
949	Largest Time for Given Digits	Easy
953	Verifying an Alien Dictionary	Easy
961	N-Repeated Elements in Size 2N Array	Easy
965	Univalued Binary Tree	Easy
970	Powerful Integers	Easy
976	Largest Perimeter Triangle	Easy
977	Squares of a Sorted Array	Easy
985	Sum of Even Numbers after Queries	Easy
989	Add to Array Form of Integer	Easy
993	Cousins in Binary Tree	Easy