http://javarevisited.blogspot.com/2015/01/top-20-string-coding-interview-question-programming-interview.html

Hash Table

http://javarevisited.blogspot.com/2015/06/top-20-array-interview-questions-and-answers.html

• Find duplicate number on Integer array (http://javarevisited.blogspot.sg/2014/01/how-to-remove-duplicates-from-array-java-without-collection-API.html)

• Find largest and smallest number in unsorted array ()

• Find kth smallest and largest element in unsorted array?

• Find common elements in three sorted array?

• Flatten array

• Reverse array

• Reverse String

• Find duplicate characters from String

1.1 Is Unique

1.2 Check Permutation

1.3 URLify

1.4 Palindrome Permutation

1.5 One Away

1.6 String Compression

1.7 Rotate Matrix

1.8 Zero Matrix

1.9 String Rotation

1. Single Linked List
2. Double Linked List
3. Circular Linked List

• Find the middle of a given linked list

• Delete Middle of Linked List (https://practice.geeksforgeeks.org/problems/delete-middle-of-linked-list/1)

• Rotate a linked list

• Merge a linked list into another linked list at alternate positions. (https://www.geeksforgeeks.org/merge-a-linked-list-into-another-linked-list-at-alternate-positions/)

2.1 Remove Duplicates

2.2 Find Kth to Last Element

2.3 Delete Middle Node

2.4 Partition

2.5 Sum Lists

2.6 List is Palindrome

2.7 Lists Intersect

2.8 Loop Detection

1. Stack
2. Queue
3. Queue with 2 stacks
4. Circular Queue

• Balanced Brackets

• Simple Text Editor

• Largest Rectangle

3.1 Three in One: Describe how you could use a single array to implement three stacks

3.2 Stack Min

3.3 Stack of Plates

3.4 Queue via Stacks

3.5 Sort Stack

1. Binary Search Tree
2. Graph

4.1 Route Between Nodes

4.2 Minimal Tree

4.3 List of Depths

4.4 Check Balanced

4.5 Validate BST

4.6 Successor

4.7 Build Order

5.1 Insertion

5.3 Flip Bit to Win

5.4 Next Number

8.1 Triple Step

8.10 Paint Fill

8.2 Robot in a Grid

8.3 Magic Index

8.4 Power Set

8.5 Recursive Multiply

8.7 Permutations without Dups

8.8 Permutations with Dups

8.9 All Combintations of Parens

1. Sorting

• Bubble Sort
• Selection Sort
• Merge Sort
• Quick Sort
• Heap Sort

2. Search

• Binary Search

10.1 Sorted Merge

10.2 Group Anagrams

10.3 Search in Rotated Array

10.5 Sparse Search

10.9 Sorted Matrix Search Bucket Sort Example

15.3 Dining Philoslophers

15.7 Concurrent Fizz Buzz