Interview Preparation

You can crack any Interview if you are preparing yourself in a well organised manner. There are lots of Data Structure and Algorithm problems on internet and it is quite impossible for a person to practice all of them. So it is really important that you practice a list of few problems which are really important and covers almost every concepts.

I have tried my best to sort all those problems for you and ordered them as well. I hope if you follow my list and study in the same order in which i have given, it will surely help you prepare very well for the Job Interview in your 2 months vacation.

Table of Contents

• Data Structures
  • Array
  • LinkedList
  • Stack
  • Queue
  • Binary Tree
  • Binary Search Tree
  • Heap and Priority Queue
• Algorithms
  • Binary Search
  • Dynamic Programming

Data Structures

• Tutorials:
  • MIT 6.006 Introduction to Algorithms, Fall 2011 (video)
  • mycodeschool (video)
  • UCSanDiegoX's Algorithms and Data Structures

Array

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Missing number in array	Leetcode , GFG
2	Subarray with given sum	GFG
3	2 Sum	LeetCode , InterviewBit, GFG ,
4	Majority Element	LeetCode , InterviewBit , GFG
5	Max Consecutive Ones	LeetCode , InterviewBit
6	Sort an array of 0s, 1s and 2s	GFG , LeetCode
7	Spiral Matrix	LeetCode , InterviewBit
8	Find the duplicate number	LeetCode
9	Largest number formed from an array	LeetCode , InterviewBit, GFG
10	Next Permutation	LeetCode , InterviewBit
11	Merge Overlapping Intervals	LeetCode , InterviewBit, GFG
12	First Missing Positive	LeetCode , InterviewBit

LinkedList

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Find middle element in a linked list	LeetCode , GFG
2	Remove n'th node from end of a linked list	LeetCode , InterviewBit
3	Intersection Point in Y shaped linked list	LeetCode , InterviewBit
4	Reverse a linked list	LeetCode , InterviewBit
5	Check if a linked list is Palindrome	LeetCode , InterviewBit
6	Rotate a LinkedList	LeetCode , InterviewBit
7	Reverse linked list in a group of given size k	LeetCode , InterviewBit
8	Detect and Remove Loop in a linked list	LeetCode , InterviewBit
9	Find length of the Loop in a linked list	GFG
10	Segregate even and odd positioned nodes in a linked list	LeetCode , GFG
11	Segregate even and odd valued nodes in a linked list	GFG
12	Clone a linked list with next and random pointer	LeetCode , GFG
13	Reorder List L1->L2->...Ln to L1->Ln->L2->Ln-1....	LeetCode , InterviewBit
14	Delete N nodes after M nodes of a linked list	GFG
15	Merge K sorted list	LeetCode , InterviewBit , GFG
16	Add two numbers represented by a linked list	LeetCode , InterviewBit

Stack

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Valid Parentheses	LeetCode
2	Length of longest valid Parentheses	LeetCode
3	Next Greater Element	GFG , LeetCode
4	Nearest Smaller Element	InterviewBit
5	Trapping Rain Water	LeetCode , InterviewBit
6	Largest Rectangle in a Histogram	LeetCode , InterviewBit
7	Min Stack	LeetCode , InterviewBit

Queue

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Generate binary numbers from 1 to n	GFG
2	Minimum time required to rot all Oranges	GFG , LeetCode
3	First non repeating character in a stream	GFG
4	Circular tour	GFG , LeetCode
5	Sliding Window Maximum	LeetCode , InterviewBit

Binary Tree

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Determine Height of a binary tree	LeetCode , InterviewBit
2	Inorder Traversal	InterviewBit
3	Preorder Traversal	InterviewBit
4	Postorder Traversal	InterviewBit
5	Level Order Traversal	LeetCode
6	Level Order Traversal in Spiral Form	LeetCode , InterviewBit
7	Left and Right View of Binary Tree	LeetCode
8	Diameter of a Binary tree	LeetCode
9	Populating Next Right Pointers in Each Node	LeetCode , InterviewBit
10	Check if a Binary Tree is Sum Tree	GFG
11	Check if a Binary Tree is Balanced	LeetCode , InterviewBit
12	Check if a Binary Tree is BST	GFG
13	Convert a given Binary Tree into its mirror Tree	GFG
14	Check if two Binary Tree are mirror image of each other	GFG
15	Check if a Binary Tree is Symmetric Binary Tree	InterviewBit , LeetCode
16	Invert a Binary Tree	InterviewBit , LeetCode
17	Vertical order Traversal	InterviewBit
18	Top View Of Binary Tree	GFG
19	Bottom View of Binary Tree	GFG
20	Check if Root to Leaf path sum exist	InterviewBit , LeetCode
21	All Root to Leaf path sum	InterviewBit , LeetCode
22	Maximum path sum from leaf to leaf	GFG
23	Maximum path sum from any node to any node	LeetCode
24	Least Common Ancestor	LeetCode
25	Find the distance between two nodes of a Binary Tree	GFG

Binary Search Tree

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Insert a Node in BST	LeetCode
2	Delete a Node from BST	LeetCode
3	Lowest common ancestor in BST	LeetCode
4	Inorder Successor in BST	LeetCode
5	Kth Smallest node in BST	LeetCode

Heap and Priority Queue

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Median in a stream of integers	GFG
2	Top K Frequent Elements in an Array	LeetCode
3	Kth Largest Element in a Stream	LeetCode
4	Sort a nearly sorted (or K sorted) array	GFG
5	Kth Smallest Element in a Sorted Matrix	LeetCode

Algorithms

Binary Search

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Find First and Last Position of Element in Sorted Array	LeetCode
2	Search in Rotated Sorted Array	LeetCode , InterviewBit , GFG
3	Find Minimum in Rotated Sorted Array	LeetCode
4	Pow(x,n)	LeetCode , InterviewBit
5	Sqrt(n)	LeetCode , InterviewBit
6	Matrix Search	LeetCode , InterviewBit
6	Median of Two Sorted Arrays	LeetCode , InterviewBit

Dynamic Programming

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Climbing Stairs	LeetCode
2	Coin Sum Infinite	InterviewBit
3	Min Cost Climbing Stairs	LeetCode
4	Rod Cutting Problem	GFG
5	Longest Common Subsequence	LeetCode
6	Print Longest Common Subsequence	Hackerrank
7	Longest Increasing Subsequence	LeetCode , InterviewBit
8	Edit Distance	LeetCode
9	Longest Common Substring	LeetCode
10	Maximum Sum Contiguous Subarray	LeetCode
11	Maximum Sum without adjacent Element(House Robber)	LeetCode
12	Maximum Product Subarray	LeetCode
13	Find minimum number of coins that make a given value	LeetCode
14	Min Cost Path	InterviewBit
15	Maximal Rectangle	LeetCode , InterviewBit
16	Minimum Jump to reach End	LeetCode , InterviewBit
17	0 - 1 Knapsack Problem	GFG
18	Partition Equal Subset Sum	LeetCode
19	Longest Palindromic Subsequence	LeetCode
20	Longest Bitonic Subsequence	InterviewBit
21	Word Break	LeetCode , InterviewBit
22	Interleaving String	LeetCode , InterviewBit
23	Matrix Chain Multiplication	LeetCode
24	Palindrome Partitioning	LeetCode

Graph

ID	PROBLEM STATEMENT	PROBLEM LINK
1	Region in Binary Matrix	InterviewBit , GFG
2	Rotting Oranges	LeetCode , GFG
3	Number of Islands	LeetCode , GFG
4	Find whether path exist	InterviewBit , GFG
5	Cycle in Undirected Graph	InterviewBit , GFG
6	Cycle in Directed Graph	InterviewBit , LeetCode
7	Topological Sort	LeetCode
8	Snakes and Ladders	LeetCode , InterviewBit
9	Alien Dictionary	GFG
10	Word Search	LeetCode , InterviewBit
11	Word Search 2	LeetCode , GFG
12	Word Ladder	InterviewBit , LeetCode