LeetCode Self Solution

Favourite Memos

Stay Hungry, Stay Foolish - Steve Jobs
The only source of knowledge is experience - Albert Einstein
Algorithms Plus Data Structures Equals Programs - Niklaus Wirth

#	Title	Solution	Difficulty	Tag
01	Two Sum	Python,Java,JavaScript	Easy	Array
02	Add Two Numbers	Python,Java	Medium	Linked List
04	Median of Two Sorted Arrays	Python,Java,JavaScript	Hard	Array
07	Reverse Integer	Python, Java	Easy	Math
09	Palindrome Number	Python, Java	Easy	Math
13	Roman to Integer	Python, Java	Easy	Math
14	Longest Common Prefix	Python, Java	Easy	String
19	Remove Nth Node From End of List	Python, Java	Medium	Linked List
20	Valid Parentheses	Python, Java	Easy	String
21	Merge Two Sorted Lists	Python, Java	Easy	Linked List
24	Swap Nodes in Pairs	Python, Java	Medium	Linked List
26	Remove Duplicates from Sorted Array	Python,Java,JavaScript	Easy	Array
27	Remove Element	Python,Java,JavaScript	Easy	Array
28	Implement strStr()	Python, Java	Easy	String
33	Search in Rotated Sorted Array	Python, Java	Medium	Array
34	Find First and Last Position of Element in Sorted Array	Python, Java	Medium	Array
35	Search Insert Position	Python, Java	Easy	Array
38	Count and Say	Python, Java	Easy	String
53	Maximum Subarray	Python, Java	Easy	Array
58	Length of Last Word	Python, Java	Easy	String
66	Plus One	Python, Java	Easy	Array
67	Add Binary	Python, Java	Easy	String
69	Sqrt(x)	Python, Java	Easy	Math
70	Climbing Stairs	Python, Java	Easy	DP
78	Subsets	Python,Java,JavaScript	Medium	Array
82	Remove Duplicates from Sorted List II	Python, Java	Medium	Linked List
83	Remove Duplicates from Sorted List	Python, Java	Easy	Linked List
88	Merge Sorted Array	Python, Java	Easy	Array
94	Binary Tree Inorder Traversal	Python, Java	Medium	Tree
98	Validate Binary Search Tree	Python, Java	Medium	Tree
100	Same Tree	Python, Java	Easy	Tree
101	Symmetric Tree	Python, Java	Easy	Tree
104	Maximum Depth of Binary Tree	Python, Java	Easy	Tree
110	Balanced Binary Tree	Python, Java	Easy	Tree
112	Path Sum	Python, Java	Easy	Tree
118	Pascal's Triangle	Python, Java	Easy	Array
119	Pascal's Triangle II	Python, Java	Easy	Array
121	Best Time to Buy and Sell Stock	Python, Java	Easy	Array
122	Best Time to Buy and Sell Stock II	Python, Java	Easy	Array
125	Valid Palindrome	Python, Java	Easy	String
135	Find Minimum in Rotated Sorted Array	Python, Java	Medium	Array
136	Single Number	Python, Java	Easy	Hash Table
141	Linked List Cycle	Python, Java	Easy	Linked List
142	Linked List Cycle II	Python, Java	Medium	Linked List
144	Binary Tree Preorder Traversal	Python, Java	Medium	Tree
145	Binary Tree Postorder Traversal	Python, Java	Hard	Tree
147	Insertion Sort List	Python, Java	Medium	Linked List
155	Min Stack	Python, Java	Easy	Stack
167	Two Sum II - Input array is sorted	Python, Java	Easy	Array
169	Majority Element	Python, Java	Easy	Array
171	Excel Sheet Column Number	Python, Java	Easy	Math
189	Rotate Array	Python, Java	Easy	Array
191	Number of 1 Bits	Python, Java	Easy	Bit Manipulation
202	Happy Number	Python, Java	Easy	Math
203	Remove Linked List Elements	Python, Java	Easy	Linked List
206	Reverse Linked List	Python, Java	Easy	Linked List
215	Kth Largest Element in an Array	Python, Java	Medium	Heap
217	Contains Duplicate	Python, Java	Easy	Array
219	Contains Duplicate II	Python, Java	Easy	Array
231	Power of Two	Python,Java,JavaScript	Easy	Math
234	Palindrome Linked List	Python, Java	Easy	Linked List
237	Delete Node in a Linked List	Python, Java	Easy	Linked List
242	Valid Anagram	Python, Java	Easy	Hash Table
257	Binary Tree Paths	Python, Java	Easy	Tree
263	Ugly Number	Python, Java	Easy	Math
268	Missing Number	Python, Java	Easy	Array
283	Move Zeros	Python, Java	Easy	Array
290	Word Pattern	Python, Java	Easy	Hash Table
326	Power of Three	Python, Java	Easy	Math
338	Counting Bits	Python, Java	Medium	Bit Manipulation
342	Power of Four	Python, Java	Easy	Bit Manipulation
344	Reverse String	Python, Java	Easy	String
345	Reverse Vowels of a String	Python, Java	Easy	String
349	Intersection of Two Arrays	Python, Java	Easy	Hash Table
350	Intersection of Two Arrays II	Python, Java	Easy	Hash Table
371	Sum of Two Integers	JavaScript, Java	Medium	Bit Manipulation
383	Ransom Note	Python, Java	Easy	String
387	First Unique Character in a String	Python, Java	Easy	String
389	Find the Difference	Python, Java	Easy	Hash Table
397	Integer Replacement	Python, Java	Medium	Bit Manipulation
409	Longest Palindrome	Python, Java	Easy	Hash Table
412	Fizz Buzz	Python, Java	Easy	Math
414	Third Maximum Number	Python, Java	Easy	Array
415	Add Strings	Python, Java	Easy	String
434	Number of Segments in a String	Python, Java	Easy	String
442	Find All Duplicates in an Array	Python,Java,JavaScript	Medium	Array
443	String Compression	Python, Java	Easy	String
448	Find All Numbers Disappeared in an Array	Python, Java	Easy	Array
459	Repeated Substring Pattern	Python, Java	Easy	String
461	Hamming Distance	Python, Java	Easy	Bit Manipulation
463	Island Perimeter	Python, Java	Easy	Hash Table
485	Max Consecutive Ones	Python, Java	Easy	Array
509	Fibonacci Number	Python,Java,JavaScript	Easy	Array
520	Detect Capital	Python, Java	Easy	String
521	Longest Uncommon Subsequence I	Python, Java	Easy	String
532	K-diff Pairs in an Array	Python, Java	Easy	Array
541	Reverse String II	Python, Java	Easy	String
551	Student Attendance Record I	Python, Java	Easy	String
557	Reverse Words in a String III	Python, Java	Easy	String
566	Reshape the Matrix	Python, Java	Easy	Array
581	Shortest Unsorted Continuous Subarray	Python, Java	Easy	Array
599	Minimum Index Sum of Two Lists	Python, Java	Easy	Hash Table
605	Can Place Flowers	Python, Java	Easy	Array
628	Maximum Product of Three Numbers	Python, Java	Easy	Array
643	Maximum Average Subarray I	Python, Java	Easy	Array
657	Judge Route Circle	Python, Java	Easy	String
661	Image Smoother	Python, Java	Easy	Array
665	Non-decreasing Array	Python, Java	Easy	Array
674	Longest Continuous Increasing Subsequence	Python, Java	Easy	Array
680	Valid Palindrome II	Python, Java	Easy	String
695	Max Area of Island	Python, Java	Easy	Array
697	Degree of an Array	Python, Java	Easy	Array
700	Search in a Binary Search Tree	Python, Java	Easy	Tree
707	Design Linked List	Python, Java	Medium	Linked List
709	To Lower Case	Python, Java	Easy	String
717	1-bit and 2-bit Characters	Python, Java	Easy	Array
724	Find Pivot Index	Python, Java	Easy	Array
728	Self Dividing Numbers	Python,Java,JavaScript	Easy	Math
729	My Calendar I	Python,Java,JavaScript	Medium	Arrray
746	Min Cost Climbing Stairs	Python, Java	Easy	Array
747	Largest Number At Least Twice of Others	Python, Java	Easy	Array
771	Jewels and Stones	Python, Java	Easy	Hash Table
788	Rotated Digits	Python, Java	Easy	String
791	Custom Sort String	Python,Java,JavaScript	Medium	String
804	Unique Morse Code Words	Python, Java	Easy	String
817	Linked List Components	Python, Java	Medium	Linked List
819	Most Common Word	Python, Java	Easy	String
824	Goat Latin	Python, Java	Easy	String
830	Positions of Large Groups	Python, Java	Easy	Array
832	Flipping an Image	Python, Java	Easy	Array
840	Magic Squares In Grid	Python, Java	Easy	Array
849	Maximize Distance to Closest Person	Python, Java	Easy	Array
859	Buddy Strings	Python, Java	Easy	String
867	Transpose Matrix	Python, Java	Easy	Array
868	Binary Gap	Python, Java	Easy	Math
877	Stone Game	Python, Java	Medium	Math
888	Fair Candy Swap	Python, Java	Easy	Array
890	Find and Replace Pattern	Python,Java,JavaScript	Medium	String
893	Groups of Special-Equivalent Strings	Python, Java	Easy	String
896	Monotonic Array	Python, Java	Easy	Array
905	Sort Array By Parity	Python, Java	Easy	Array
914	X of a Kind in a Deck of Cards	Python, Java	Easy	Array
917	Reverse Only Letters	Python, Java	Easy	String
922	Sort Array By Parity II	Python, Java	Easy	Array
925	Long Pressed Name	Python, Java	Easy	String
929	Unique Email Addresses	Python, Java	Easy	String
941	Valid Mountain Array	Python, Java	Easy	Array
945	Minimum Increment to Make Array Unique	Python, Java	Medium	Array
950	Reveal Cards In Increasing Order	Python, Java	Medium	Array
961	N-Repeated Element in Size 2N Array	Python,Java,JavaScript	Easy	Array
977	Squares of a Sorted Array	Python, Java	Easy	Array
985	Sum of Even Numbers After Queries	Python, Java	Easy	Array
989	Add to Array-Form of Integer	Python, Java	Easy	Array
1002	Find Common Characters	Python,Java,JavaScript	Easy	Array
1016	Binary String With Substrings Representing 1 To N	Python,Java,JavaScript	Medium	String
1721	Swapping Nodes in a Linked List	Python, Java	Medium	Linked List