LeetCode

LeetCode Problem Solving in Python.

#	Title	Difficulty	Solution
1	Two Sum 👍	Easy	O(n^2), O(n)
2	Add Two Numbers	Medium	O(n)
3	Longest Substring Without Repeating Characters	Medium	O(n^2), O(n)
4	Median of Two Sorted Arrays	Hard	O(n), O(log(n))
5	Longest Palindromic Substring	Medium	O(n^2)
6	ZigZag Conversion 👍	Medium	O(n)
7	Reverse Integer 🤦	Easy	O(1)
8	String to Integer (atoi) 🤦	Medium	O(n)
9	Palindrome Number	Easy	O(n)
10	Regular Expression Matching	Hard	O(n^2)
11	Container With Most Water	Medium	O(n)
12	Integer to Roman	Medium	O(1)
13	Roman to Integer	Easy	O(1)
14	Longest Common Prefix	Easy	O(n^2)
15	3Sum 👍	Medium	O(n^2)
16	3Sum Closest 👍	Medium	O(n^2)
17	Letter Combinations of a Phone Number	Medium	O(1)
18	4Sum	Medium	O(n^3)
19	Remove Nth Node From End of List	Medium	O(n)
20	Valid Parentheses	Easy	O(n)
21	Merge Two Sorted Lists	Easy	O(n)
22	Generate Parentheses	Medium	Sol
23	Merge k Sorted Lists 👍	Hard	O(nlogn)
24	Swap Nodes in Pairs	Medium	O(n)
25	Reverse Nodes in k-Group	Hard	O(n)
26	Remove Duplicates from Sorted Array	Easy	O(n)
27	Remove Element	Easy	O(n)
28	Implement strStr() 🤦	Easy	O(n^2)
29	Divide Two Integers 🤦	Medium	O(1)
30	Substring with Concatenation of All Words	Hard	O(nmlogm)
31	Next Permutation	Medium	O(nlogn)
32	Longest Valid Parentheses 👍	Hard	O(n)
33	Search in Rotated Sorted Array	Medium	O(logn)
34	Find First and Last Position of Element in Sorted Array	Medium	O(logn)
35	Search Insert Position	Easy	O(logn)
36	Valid Sudoku	Medium	O(1)
37	Sudoku Solver	Hard	Sol
38	Count and Say	Medium	O(2^n)
39	Combination Sum 👍	Medium	O(nm)
40	Combination Sum II	Medium	O(2^n)
41	First Missing Positive 👍	Hard	O(n), O(nlogn)
42	Trapping Rain Water 👍	Hard	O(n)
43	Multiply Strings	Medium	O(nm)
44	Wildcard Matching	Hard	O(nm)
45	Jump Game II	Medium	O(n^2)
46	Permutations	Medium	O(n!)
47	Permutations II	Medium	O(n!)
48	Rotate Image	Medium	O(n^2)
49	Group Anagrams	Medium	O(nmlogm)
50	Pow(x, n) 🤦	Medium	O(1)

Problems with 👍 are recommended by me.
Problems with 🤦 have more downvotes than upvotes in leetcode and I agreed to that the problem is not that good.