Leetcode

Leetcode problems and my solutions

No.	Problem Title	Difficulty	Date	Attempt
617	Merge Two Binary Trees	Easy	2020-09-15	3
461	Hamming Distance	Easy	2020-09-16	3
344	Reverse String	Easy	2020-09-16	3
104	Maximum Depth of Binary Tree	Easy	2020-09-16	3
136	Single Number	Easy	2020-09-16	3
226	Invert Binary Tree	Easy	2020-09-16	3
237	Delete Node in a Linked List	Easy	2020-09-16	3
412	Fizz Buzz	Easy	2020-09-16	3
206	Reverse Linked List	Easy	2020-09-16	3
169	Majority Element	Easy	2020-09-16	3
108	Convert Sorted Array to Binary Search Tree	Easy	2020-09-17	3
283	Move Zeroes	Easy	2020-09-17	3
122	Best Time to Buy and Sell Stock II	Easy	2020-09-17	3
242	Valid Anagram	Easy	2020-09-17	3
171	Excel Sheet Column Number	Easy	2020-09-17	3
217	Contains Duplicate	Easy	2020-09-17	3
448	Find All Numbers Disappeared in an Array	Easy	2020-09-17	3
13	Roman to Integer	Easy	2020-09-17	3
21	Merge Two Sorted Lists	Easy	2020-09-17	3
100	Same Tree	Easy	2020-09-17	3
121	Best Time to Buy and Sell Stock	Easy	2020-09-18	3
350	Intersection of Two Arrays II	Easy	2020-09-18	3
268	Missing Number	Easy	2020-09-18	3
118	Pascal's Triangle	Easy	2020-09-18	3
387	First Unique Character in a String	Easy	2020-09-18	3
38	Count and Say	Easy	2020-09-19	3
26	Remove Duplicates from Sorted Array	Easy	2020-09-19	3
1	Two Sum	Easy	2020-09-19	3
53	Maximum Subarray	Easy	2020-09-19	3
101	Symmetric Tree	Easy	2020-09-19	3
70	Climbing Stairs	Easy	2020-09-19	3
543	Diameter of Binary Tree	Easy	2020-09-19	3
9	Palindrome Number	Easy	2020-09-19	3
191	Number of 1 Bits	Easy	2020-09-19	3
202	Happy Number	Easy	2020-09-19	3
326	Power of Three	Easy	2020-09-20	3
198	House Robber	Easy	2020-09-20	3
66	Plus One	Easy	2020-09-20	3
724	Find Pivot Index	Easy	2020-09-20	3
155	Min Stack	Easy	2020-09-20	3
14	Longest Common Prefix	Easy	2020-09-21	3
278	First Bad Version	Easy	2020-09-21	3
125	Valid Palindrome	Easy	2020-09-21	3
172	Factorial Trailing Zeros	Easy	2020-09-21	3
20	Valid Parentheses	Easy	2020-09-21	3
234	Palindrome Linked List	Easy	2020-09-21	3
88	Merge Sorted Array	Easy	2020-09-21	3
190	Reverse Bits	Easy	2020-09-21	3
160	Intersection of Two Linked Lists	Easy	2020-09-21	3
141	Linked List Cycle	Easy	2020-09-21	3
189	Rotate Array	Easy	2020-09-22	3
28	Implement strStr()	Easy	2020-09-22	3
69	Sqrt(x)	Easy	2020-09-22	3
204	Count Primes	Easy	2020-09-22	3
581	Shortest Unsorted Continuous Subarray	Easy	2020-09-22	3
7	Reverse Integer	Easy	2020-09-22	3
763	Partition Labels	Medium	2020-09-24	3
338	Counting Bits	Medium	2020-09-24	3
406	Queue Reconstruction by Height	Medium	2020-09-24	3
46	Permutations	Medium	2020-09-24	3
94	Binary Tree Inorder Traversal	Medium	2020-09-26	3
739	Daily Temperature	Medium	2020-09-26	3
22	Generate Parentheses	Medium	2020-09-26	3
78	Subsets	Medium	2020-09-26	3
347	Top K Frequent Elements	Medium	2020-09-27	3
647	Palindromic Substrings	Medium	2020-09-27	3
230	Kth Smallest Element in a BST	Medium	2020-09-27	3
238	Product of Array Except Self	Medium	2020-09-27	3
1143	Longest Common Subsequence	Medium	2020-09-28	3
48	Rotate Image	Medium	2020-09-28	3
49	Group Anagrams	Medium	2020-09-28	3
39	Combination Sum	Medium	2020-09-28	3
454	4Sum II	Medium	2020-10-01	3
62	Unique Paths	Medium	2020-10-01	3
378	Kth Smallest Element in a Sorted Matrix	Medium	2020-10-01	3
64	Minimum Path Sum	Medium	2020-10-01	3
102	Binary Tree Level Order Traversal	Medium	2020-10-01	3
289	Game of Life	Medium	2020-10-01	3
145	Binary Tree Postorder Traversal	Medium	2020-10-01	3
287	Find the Duplicate Number	Medium	2020-10-01	3
215	Kth Largest Element in an Array	Medium	2020-10-01	3
328	Odd Even Linked List	Medium	2020-10-01	3
875	Koko Eating Bananas	Medium	2020-10-02	3
384	Shuffle an Array	Medium	2020-10-02	3
341	Flatten Nested List Iterator	Medium	2020-10-02	3
96	Unique Binary Search Trees	Medium	2020-10-02	3
11	Container With Most Water	Medium	2020-10-04	3
337	House Robber III	Medium	2020-10-04	3
394	Decode String	Medium	2020-10-04	3
371	Sum of Two Integers	Medium	2020-10-04	3
621	Task Scheduler	Medium	2020-10-05	3
208	Implement Trie (Prefix Tree)	Medium	2020-10-05	3
114	Flatten Binary Tree to Linked List	Medium	2020-10-05	3
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	2020-10-05	3
75	Sort Colors	Medium	2020-10-06	3
131	Palindrome Partitioning	Medium	2020-10-06	3
103	Binary Tree Zigzag Level Order Traversal	Medium	2020-10-06	3
36	Valid Sudoku	Medium	2020-10-06	3
17	Letter Combinations of a Phone Number	Medium	2020-10-07	3
309	Best Time to Buy and Sell Stock with Cooldown	Medium	2020-10-07	3
279	Perfect Squares	Medium	2020-10-07	3
380	Insert Delete GetRandom O(1)	Medium	2020-10-07	3
116	Populating Next Right Pointers in Each Node	Medium	2020-10-12	3
236	Lowest Common Ancestor of a Binary Tree	Medium	2020-10-12	3
200	Number of Islands	Medium	2020-10-12	3
437	Path Sum III	Medium	2020-10-12	3
416	Partition Equal Subset Sum	Medium	2020-10-13	3
1049	Last Stone Weight II	Medium	2020-10-13	3
494	Target Sum	Medium	2020-10-13	3
16	3Sum Closest	Medium	2020-10-13	3
148	Sort List	Medium	2020-10-14	3
207	Course Schedule	Medium	2020-10-14	3
560	Subarray Sum Equals K	Medium	2020-10-14	3
438	Find All Anagrams in a String	Medium	2020-10-14	3
300	Longest Increasing Subsequence	Medium	2020-10-15	3
240	Search a 2D Matrix II	Medium	2020-10-15	3
162	Find Peak Element	Medium	2020-10-15	3
73	Set Matrix Zeroes	Medium	2020-10-15	3
134	Gas Station	Medium	2020-10-18	3
139	Word Break	Medium	2020-10-18	3
210	Course Schedule II	Medium	2020-10-18	3
395	Longest Substring with At Least K Repeating Characters	Medium	2020-10-18	3
787	Cheapest Flights Within K Stops	Medium	2020-10-19	3
56	Merge Intervals	Medium	2020-10-19	3
334	Increasing Triplet Subsequence	Medium	2020-10-19	3
713	Subarray Product Less Than K	Medium	2020-10-19	3
142	Linked List Cycle II	Medium	2020-10-20	3
221	Maximal Square	Medium	2020-10-20	3
138	Copy List with Random Pointer	Medium	2020-10-20	3
227	Basic Calculator II	Medium	2020-10-20	3
6	ZigZag Conversion	Medium	2020-10-21	3
150	Evaluate Reverse Polish Notation	Medium	2020-10-21	3
34	Find First and Last Position of Element in Sorted Array	Medium	2020-10-21	3
322	Coin Change	Medium	2020-10-21	3
79	Word Search	Medium	2020-10-22	3
19	Remove Nth Node From End of List	Medium	2020-10-22	3
33	Search in Rotated Sorted Array	Medium	2020-10-22	3
63	Unique Paths II	Medium	2020-10-22	3
146	LRU Cache	Medium	2020-10-25	3
2	Add Two Numbers	Medium	2020-10-25	3
54	Spiral Matrix	Medium	2020-10-25	3
55	Jump Game	Medium	2020-10-25	3
50	Pow(x, n)	Medium	2020-10-27	3
3	Longest Substring Without Repeating Characters	Medium	2020-10-27	3
152	Maximum Product Subarray	Medium	2020-10-27	3
5	Longest Palindromic Substring	Medium	2020-10-28	3
179	Largest Number	Medium	2020-10-28	3
324	Wiggle Sort II	Medium	2020-10-28	3
127	Word Ladder	Medium	2020-10-28	3
91	Decode Ways	Medium	2020-10-29	3
15	3Sum	Medium	2020-10-29	3
98	Validate Binary Search Tree	Medium	2020-10-29	3
130	Surrounded Regions	Medium	2020-10-29	3
8	String to Integer (atoi)	Medium	2020-11-02	3
29	Divide Two Integers	Medium	2020-11-02	3
72	Edit Distance	Hard	2020-11-04	3
295	Find Median from Data Stream	Hard	2020-11-04	3
123	Best Time to Buy and Sell Stock III	Hard	2020-11-09	3
829	Consecutive Numbers Sum	Hard	2020-11-10	3
31	Next Permutation	Medium	2020-11-16	1
173	Binary Search Tree Iterator	Medium	2020-11-17	1
92	Reverse Linked List II	Medium	2020-11-20	1
95	Unique Binary Search Trees II	Medium	2020-11-23	1
24	Swap Nodes in Pairs	Medium	2020-11-24	1
209	Minimum Size Subarray Sum	Medium	2020-11-25	1
199	Binary Tree Right Side View	Medium	2020-11-26	1
120	Triangle	Medium	2020-11-28	1
188	Best Time to Buy and Sell Stock IV	Hard	2020-11-30	1
442	Find All Duplicates in an Array	Medium	2020-12-01	1
222	Count Complete Tree Nodes	Medium	2020-12-02	1
47	Permutations II	Medium	2020-12-02	1
109	Convert Sorted List to Binary Search Tree	Medium	2020-12-05	1
18	4Sum	Medium	2020-12-06	1
153	Find Minimum in Rotated Sorted Array	Medium	2020-12-07	1
695	Max Area of Island	Medium	2020-12-10	1
654	Maximum Binary Tree	Medium	2020-12-14	1
547	Friend Circles	Medium	2020-12-15	1
43	Multiply Strings	Medium	2020-12-16	1
310	Minimum Height Trees	Medium	2020-12-17	1
516	Longest Palindromic Subsequence	Medium	2020-12-19	1
241	Different Ways to Add Parentheses	Medium	2020-12-20	1
863	All Nodes Distance K in Binary Tree	Medium	2020-12-22	1
143	Reorder List	Medium	2020-12-23	1
402	Remove K Digits	Medium	2020-12-28	1
450	Delete Node in a BST	Medium	2021-01-01	1