LeetCode ID	Difficulty	Problem
1	Easy	Two Sum
20	Easy	Valid Parentheses
21	Easy	Merge Two Sorted Lists
104	Easy	Maximum Depth of Binary Tree
110	Easy	Balanced Binary Tree
121	Easy	Best Time to Buy and Sell Stock
125	Easy	Valid Palindrome
141	Easy	Linked List Cycle
206	Easy	Reverse Linked List
217	Easy	Contains Duplicate
226	Easy	Invert Binary Tree
242	Easy	Valid Anagram
543	Easy	Diameter of Binary Tree
746	Easy	Min Cost Climbing Stairs
2053	Easy	Kth Distinct String in an Array
3	Medium	Longest Substring Without Repeating Characters
11	Medium	Container With Most Water
15	Medium	3Sum
19 *	Medium	Remove Nth Node From End of List
22	Medium	Generate Paretheses
33	Medium	Search In Rotated Sorted Array
36	Medium	Valid Sudoku
49	Medium	Group Anagrams
53	Medium	Maximum Subarray
64	Medium	Minimum Path Sum
92	Medium	Reverse Linked List II
102	Medium	Binary Tree Level Order Traversal
128	Medium	Longest Consecutive Sequence
150	Medium	Evaluate Reverse Polish Notation
153	Medium	Find Minimum in Rotated Sorted Array
155	Medium	Min Stack
165 *	Medium	Compare Version Numbers
167	Medium	Two Sum II - Input Array Is Sorted
198	Medium	House Robber
200	Medium	Number Of Islands
208	Medium	Implement Trie (Prefix Tree)
211	Medium	Design Add and Search Words Data Structure
235	Medium	Lowest Common Ancestor of a Binary Search Tree
238	Medium	Product of Array Except Self
347	Medium	Top K Frequent Elements
424	Medium	Longest Repeating Character Replacement
567	Medium	Permutation In String
684	Medium	Redundant Connection
695	Medium	Max Area Of Island
704	Medium	Binary Search
739	Medium	Daily Temperatures
875	Medium	Koko Eating Bananas
951	Medium	Flip Equivalent Binary Trees
981	Medium	Time Based Key Value-Store
1509	Medium	Minimum Difference Between Largest and Smallest Value in Three Moves
1525	Medium	Number of Good Ways to Split a String
	Medium	String Encode and Decode
42	Hard	Trapping Rain Water
76	Hard	Minimum Window Substring

* includes an solution with my explaination. Click on the problem link to read more!