The LeetCode (Java)

Result

Easy	Medium	Hard	Overall
42	47	4	93

Number	Title	Solution	Difficulty	Tag
1	Two Sum	1		Array
2	Add Two Numbers	2		CTCI, LinkedList
3	Longest Substring Without Repeating Characters	3		String
5	Longest Palindromic Substring	5		String
6	ZigZag Conversion	6		String
7	Reverse Integer	7		Math
8	String to Integer (atoi)	8		String
9	Palindrome Number	9		Math
11	Container With Most Water	11		Array, Two pointers, Greedy
12	Integer to Roman	12		String
13	Roman to Integer	13		String, Math
14	Longest Common Prefix	14		String
15	3Sum	15		Array, Two pointers, Sorting
17	Letter Combinations of a Phone Number	17		String, DFS, Backtracking
19	Remove Nth Node From End of List	19		LinkedList, Math, Recursion
20	Valid Parentheses	20		String, Stack
21	Merge Two Sorted Lists	21		LinkedList
23	Merge k Sorted Lists	23		LinkedList
26	Remove Duplicates from Sorted Array	26		Array, Two Pointers
27	Remove Element	27		Array
28	Remove Element	28		Array
29	Divide Two Integers	29		Math
31	Next Permutation	31		Array
35	Search Insert Position	35		Array, Binary Search
36	Valid Sudoku	36		Array, Hash Table, Matrix
45	Jump Game II	45		Array, Dynamic Programming, Greedy
48	Rotate Image	48		Array, Math, Matrix
53	Maximum Subarray	53		Array, Divide and Coquer, Dynamic Programming
66	Plus One	66		Array, Math
67	Add Binary	67		Math, String, Bit Manipulation, Simulation
70	Climbing Stairs	70		Mayh, Dynamic Programming, Memoization
71	Simplify Path	71		String, Stack
88	Merge Sorted Array	88		Array, Two Pointers, Sorting
116	Populating Next Right Pointers in Each Node	116		Tree, Depth-First Search, Breadth-First-Search, Binary Tree
122	Best Time to Buy and Sell Stock II	122		Array, DynamicProgramming, Greedy
125	Valid Palindrome	125		Two Pointers, String
136	Single Number	136		Array, BitManipulation
138	Copy List with Random Pointer	138		Hash Table, Linked List
141	Linked List Cycle	141		Hash Table, Linked List, Two Pointers
160	Intersection of Two Linked Lists	160		Hash Table, Linked List, Two Pointers
167	Two Sum II - Input array is sorted	167		Array, Two Pointers, Binary Search
189	Rotate Array	189		Array, Math, Two Pointers
191	Number of 1 Bits	191		Bit Manipulation
199	Binary Tree Right Side View	199		Tree, Depth-First Search, Breadth-First-Search, Binary Tree

Legend

Easy	Medium	Hard