Favorates for Amazon Coding interviews

 

1. https://leetcode.com

  

2. https://www.interviewbit.com/

3. https://www.geeksforgeeks.org/

4. https://www.monsterindia.com

- most frequent interview questions

Leetcode frequency 별로 되어 있으니 참고하세요.

Leetcode Questions - for Amazon
Id	Question	Difficulty	Data Structures	Algorithms
1	Two Sum	2	1. array	1. sort
			2. set	2. two pointers
2	Add Two Numbers	3	1. linked list	1. two pointers
				2. math
3	Longest Substring Without Repeating Characters	3	1. string	1. two pointers
			2. hashtable
771	Jewels and Stone	3
20	Valid Parentheses	2	1. string	1. stack
21	Merge Two Sorted Lists	2	1. linked list	1. sort
				2. two pointers
535	Encode and Decode TinyURL	3
5	Longest Palindromic Substring	4	1. string
206	Reverse Linked List	2
146	LRU Cache	5
155	Min Stack	2
23	Merge k Sorted Lists	3	1. linked list	1. sort
			2. heap	2. two pointers
				3. merge
141	Linked List Cycle	2
42	Trapping Rain Water	4	1. array	1. two pointers
				2. stack
121	Best Time to Buy and Sell Stock	2	1. array	1. dp
15	3Sum	3	1. array	1. two pointers
617	Merge Two Binary Trees	2
17	Letter Combinations of a Phone Number	3	1. string	1. dfs
238	Product of Array Except Self	3
138	Copy List with Random Pointer	3
49	Anagrams	3	1. string
			2. hashtable
200	Number of Island	3
139	Word Break	3
48	Rotate Image	4	1. array
234	Palindrome Linked List	2
8	String to Integer (atoi)	2	1. string	1. math
160	Intersection of Two Linked Lists	2
242	Valid Anagram	2
235	Lowest Common Ancester of a Binary Search Tree	2
167	Two Sum II - Input array is sorted	2
89	Gray Code	4		1. combination
189	Rotate Array	2
73	Set Matrix Zeroes	3	1. array
387	First Unique Character in a String	2
240	Search a 2D Matrix II	3
204	Count Primes	2
236	Lowest Common Ancestor of a Binary Tree	3
78	Subsets	3	1. array	1. recursion
				2. combination
127	Word Ladder	3	1. graph	1. bfs
				2. shortest path
215	Kth Largest Element in an Array	4
297	Serialize and Deserialize Binary Tree	5
102	Binary Tree Level Order Traversal	3	1. tree	1. bfs
119	Pascal's Triangle II	2	1. array
746	Min Cost Climbing Stairs	2
239	Sliding Window Maximum	5
682	Baseball Game	2
199	Binary Tree Right Side View	3
126	Word Ladder II	1
380	Insert Delete GetRandom O(1)	3
538	Convert BST to Greater Tree	2