SDE SHEET – A Complete Guide for SDE Preparation
SDE Sheet is a curated list of the most popular questions among important topics, such as Data Structure and Algorithms (DSA), CS Subjects, Aptitude, etc, asked in the Software Development Engineer Interviews.
 This sheet contains a wide range of coding questions from different Data Structures and Algorithms.
 It covers all the segments roundwise like MCQs, DSA (Coding Questions), CS Subjects, Puzzles, System Design, Projects.
 It is helpful for both – Freshers and Experienced.
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 MCQs
 Aptitude and Reasoning
 Computer Science Subjects
 C
 C++
 Java
 Data Structures
 Algorithms
 OS
 DBMS
 CN
 CS Subjects
 Puzzles
 Projects
 System Design
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Keep a track of all the DSA problems mentioned below – Practice SDE Sheet
Check out the tutorial videos for all of the problems listed below â€“ SDE Sheet Videos. We will continue to add videos on a daily basis.
Question  Article  Practice  Video 

Leaders in an array  View  Solve  Watch 
Equilibrium point  View  Solve  Watch 
Sort an array of 0s, 1s and 2s  View  Solve  Watch 
Reverse array in groups  View  Solve  Watch 
Convert array into ZigZag fashion  View  Solve  Watch 
Rearrange array alternatively  View  Solve  Watch 
Missing number in array  View  Solve  Watch 
Kth element of two sorted Arrays  View  Solve  Watch 
Check if two arrays are equal or not  View  Solve  Watch 
Kadane’s Algorithm  View  Solve  Watch 
Subarray with given sum  View  Solve  Watch 
Trapping Rain Water  View  Solve  Watch 
Minimum Platforms  View  Solve  Watch 
Stock buy and sell  View  Solve  Watch 
Largest Number formed from an Array  View  Solve  Watch 
Largest subarray with 0 sum  View  Solve  Watch 
Swapping pairs make sum equal  View  Solve  Watch 
Question  Article  Practice  Video 

Binary Search  View  Solve  Watch 
Quick Sort  View  Solve  Watch 
Merge Sort  View  Solve  Watch 
Merge two sorted arrays  View  Solve  Watch 
Inversion of Array  View  Solve  Watch 
Search in a Rotated Array  View  Solve  Watch 
Sorting Elements of an Array by Frequency  View  Solve  Watch 
Sum of Middle Elements of two sorted arrays  View  Solve  Watch 
Kâ€™th smallest element  View  Solve  Watch 
Allocate minimum number of pages  View  Solve  Watch 
Question  Article  Practice  Video 

First element to occur k times  View  Solve  Watch 
Find the element that appears once in sorted array  View  Solve  Watch 
Number of pairs  View  Solve  Watch 
Find all pairs with a given sum  View  Solve  Watch 
Common elements  View  Solve  Watch 
Find all four sum numbers  View  Solve  Watch 
Count distinct elements in every window  View  Solve  Watch 
Array Pair Sum Divisibility Problem  View  Solve  Watch 
Longest consecutive subsequence  View  Solve  Watch 
Array Subset of another array  View  Solve  Watch 
Zero Sum Subarrays  View  Solve  Watch 
Relative Sorting  View  Solve  Watch 
Question  Article  Practice  Video 

Rotate a matrix  View  Solve  Watch 
Spirally traversing a matrix  View  Solve  Watch 
Search in a row wise and column wise sorted matrix  View  Solve  Watch 
Print all palindromic paths from top left to bottom right in a matrix  View  Solve  Watch 
Find the row with maximum number of 1s  View  Solve  Watch 
Find median in row wise sorted matrix  View  Solve  Watch 
Check if all rows of a matrix are circular rotations of each other  View  Solve  Watch 
Question  Article  Practice  Video 

Find first repeated character  View  Solve  Watch 
Reverse words in a given string  View  Solve  Watch 
Check if string is rotated by two places  View  Solve  Watch 
Roman Number to Integer  View  Solve  Watch 
Anagram  View  Solve  Watch 
Remove Duplicates  View  Solve  Watch 
Longest Distinct Characters in the string  View  Solve  Watch 
Implement Atoi  View  Solve  Watch 
Implement strstr  View  Solve  Watch 
Rabin Karp Algorithm  View  Solve  Watch 
KMP Algorithm  View  Solve  Watch 
Convert a Sentence into its equivalent mobile numeric keypad sequence.  View  Solve  Watch 
Longest Common Prefix  View  Solve  Watch 
Smallest window in a string containing all the characters of another string  View  Solve  Watch 
Uncommon characters  View  Solve  Watch 
Minimum indexed character  View  Solve  Watch 
Recursion: The process in which a function calls itself directly or indirectly is called recursion and the corresponding function is called as recursive function.
Backtracking: Backtracking is an algorithmictechnique for solving problems recursively by trying to build a solution incrementally, one piece at a time, removing those solutions that fail to satisfy the constraints of the problem at any point of time (by time, here, is referred to the time elapsed till reaching any level of the search tree).
Question  Article  Practice  Video 

Recursively remove all adjacent duplicates  View  Solve  Watch 
Tower Of Hanoi  View  Solve  Watch 
Special Keyboard  View  Solve  Watch 
Permutations of a given string  View  Solve  Watch 
NQueen Problem  View  Solve  Watch 
Solve the Sudoku  View  Solve  Watch 
Rat in a Maze Problem  View  Solve  Watch 
Word Boggle  View  Solve  Watch 
Generate IP Addresses  View  Solve  Watch 
Question  Article  Practice  Video 

Find first set bit  View  Solve  Watch 
Rightmost different bit  View  Solve  Watch 
Check whether Kth bit is set or not  View  Solve  Watch 
Toggle bits given range  View  Solve  Watch 
Set kth bit  View  Solve  Watch 
Power of 2  View  Solve  Watch 
Bit Difference  View  Solve  Watch 
Rotate Bits  View  Solve  Watch 
Swap all odd and even bits  View  Solve  Watch 
Count total set bits  View  Solve  Watch 
Longest Consecutive 1’s  View  Solve  Watch 
Sparse Number  View  Solve  Watch 
Alone in a couple  View  Solve  Watch 
Maximum subset XOR  View  Solve  Watch 
Stack: A stack is a linear data structure in which elements can be inserted and deleted only from one side of the list, called the top. A stack follows the LIFO (Last In First Out) principle.
Queue: A queue is a linear data structure in which elements can be inserted only from one side of the list called rear, and the elements can be deleted only from the other side called the front. The queue data structure follows the FIFO (First In First Out) principle.
Question  Article  Practice  Video 

Parenthesis Checker  View  Solve  Watch 
Merge Overlapping Intervals  View  Solve  Watch 
Stock span problem  View  Solve  Watch 
Next larger element  View  Solve  Watch 
Largest Rectangular Area in a Histogram  View  Solve  Watch 
Queue using two Stacks  View  Solve  Watch 
Stack using two queues  View  Solve  Watch 
Get minimum element from stack  View  Solve  Watch 
LRU Cache  View  Solve  Watch 
Circular tour  View  Solve  Watch 
First nonrepeating character in a stream  View  Solve  Watch 
Rotten Oranges  View  Solve  Watch 
Maximum of all subarrays of size k  View  Solve  Watch 
Question  Article  Practice  Video 

Finding middle element in a Linked list  View  Solve  Watch 
Reverse a Linked list  View  Solve  Watch 
Rotate a Linked List  View  Solve  Watch 
Reverse a Linked List in groups of given size  View  Solve  Watch 
Intersection point in Y shaped Linked lists  View  Solve  Watch 
Detect Loop in Linked list  View  Solve  Watch 
Remove loop in Linked List  View  Solve  Watch 
n’th node from end of Linked list  View  Solve  Watch 
Flattening a Linked List  View  Solve  Watch 
Merge two sorted Linked lists  View  Solve  Watch 
Pairwise swap of a Linked list  View  Solve  Watch 
Add two numbers represented by Linked lists  View  Solve  Watch 
Check if Linked List is Palindrome  View  Solve  Watch 
Implement Queue using Linked List  View  Solve  Watch 
Implement Stack using Linked List  View  Solve  Watch 
Given a Linked list of 0s, 1s and 2s, sort it  View  Solve  Watch 
Delete without head pointer  View  Solve  Watch 
Question  Article  Practice  Video 

Height of Binary Tree  View  Solve  Watch 
Number of leaf nodes  View  Solve  Watch 
Check if given Binary Tree is Height Balanced or Not  View  Solve  Watch 
Write Code to Determine if Two Trees are Identical or Not  View  Solve  Watch 
Given a binary tree, check whether it is a mirror of itself  View  Solve  Watch 
Maximum Path Sum  View  Solve  Watch 
Print Left View of Binary Tree  View  Solve  Watch 
Print Bottom View of Binary Tree  View  Solve  Watch 
Print a Binary Tree in Vertical Order  View  Solve  Watch 
Diameter of a Binary Tree  View  Solve  Watch 
Level order traversal in spiral form  View  Solve  Watch 
Connect Nodes at Same Level  View  Solve  Watch 
Convert a given Binary Tree to Doubly Linked List  View  Solve  Watch 
Serialize and Deserialize a Binary Tree  View  Solve  Watch 
 The left subtree of a node contains only nodes with keys lesser than the nodeâ€™s key.
 The right subtree of a node contains only nodes with keys greater than the nodeâ€™s key.
 The left and right subtree each must also be a binary search tree.
Question  Article  Practice  Video 

Check for BST  View  Solve  Watch 
Lowest Common Ancestor in a BST  View  Solve  Watch 
Ceil in BST  View  Solve  Watch 
Kth Largest Element in BST  View  Solve  Watch 
Largest BST in Binary Tree  View  Solve  Watch 
Merge Two Balanced Binary Search Trees  View  Solve  Watch 
Sorted Array to Balanced BST  View  Solve  Watch 
Question  Article  Practice  Video 

Activity Selection  View  Solve  Watch 
N meetings in one room  View  Solve  Watch 
Coin Piles  View  Solve  Watch 
Maximize Toys  View  Solve  Watch 
Page Faults in LRU  View  Solve  Watch 
Largest number possible  View  Solve  Watch 
Minimize the heights  View  Solve  Watch 
Minimize the sum of product  View  Solve  Watch 
Huffman Decoding  View  Solve  Watch 
Minimum Spanning Tree  View  Solve  Watch 
Question  Article  Practice  Video 

Minimum number of Coins  View  Solve  Watch 
Longest Common Substring  View  Solve  Watch 
Longest Increasing Subsequence  View  Solve  Watch 
Longest Common Subsequence  View  Solve  Watch 
0 – 1 Knapsack Problem  View  Solve  Watch 
Maximum sum increasing subsequence  View  Solve  Watch 
Minimum number of jumps  View  Solve  Watch 
Edit Distance  View  Solve  Watch 
Coin Change Problem  View  Solve  Watch 
Subset Sum Problem  View  Solve  Watch 
Longest Palindrome in a String  View  Solve  Watch 
Form a Palindrome  View  Solve  Watch 
Box Stacking  View  Solve  Watch 
Rod Cutting  View  Solve  Watch 
Min Cost Path  View  Solve  Watch 
Minimum sum partition  View  Solve  Watch 
Count number of ways to cover a distance  View  Solve  Watch 
Egg Dropping Puzzle  View  Solve  Watch 
Question  Article  Practice  Video 

Heap Sort  View  Solve  Watch 
Find median in a stream  View  Solve  Watch 
Operations on Binary Min Heap  View  Solve  Watch 
Rearrange characters  View  Solve  Watch 
Merge K sorted Linked lists  View  Solve  Watch 
Kth smallest element in a rowcolumn wise sorted matrix  View  Solve  Watch 
Question  Article  Practice  Video 

Depth First Traversal  View  Solve  Watch 
Breadth First Traversal  View  Solve  Watch 
Detect cycle in undirected graph  View  Solve  Watch 
Detect cycle in a directed graph  View  Solve  Watch 
Topological sort  View  Solve  Watch 
Find the number of islands  View  Solve  Watch 
Implementing Dijkstra  View  Solve  Watch 
Minimum Swaps  View  Solve  Watch 
Strongly Connected Components  View  Solve  Watch 
Shortest Source to Destination Path  View  Solve  Watch 
Find whether path exist  View  Solve  Watch 
Minimum Cost Path  View  Solve  Watch 
Circle of Strings  View  Solve  Watch 
Floyd Warshall  View  Solve  Watch 
Alien Dictionary  View  View  Watch 
Snake and Ladder Problem  View  Solve  Watch 
Question  Article  Practice  Video 

Trie  (Insert and Search)  View  Solve  Watch 
Trie  (Delete)  View  Solve  Watch 
Print unique rows in a given Binary matrix  View  Solve  Watch 
Counting the number of words in a Trie  View  Solve  Watch 
Longest Common Prefix using Trie  View  Solve  Watch 
Autocomplete feature using Trie  View  Solve  Watch 
Boggle  Set 2 (Using Trie)  View  Solve  Watch 
Minimum XOR Value Pair  View  Solve  Watch 
Palindrome pair in an array of words (or strings)  View  Solve  Watch 
Below links contains complete Operating System Study Material:
 Commonly Asked Operating Systems Interview Questions
 Last Minute Notes (LMNs)  Operating Systems
 Complete Tutorial on Operating System
Below Links contains complete DBMS study Material:
 Commonly Asked DBMS Interview Questions
 Commonly Asked DBMS Interview Questions  Set2
 Last Minute Notes (LMNs)  DBMS
 Complete Tutorial on DBMS
Below Links contains complete SQL study Material:
 SQL Interview Questions
 SQL Interview Questions  Set2
 SQL Interview Questions  Set3
 Complete Tutorial on SQL
Below Links contains complete Computer Networks study Material:
 Commonly Asked Computer Networks Interview Questions
 Last Minute Notes (LMNs)  Computer Networks
 Complete Tutorial on Computer Networks
Try to solve these 20 most popular puzzles asked in Interviews
If you haven’t made a project then take an idea from GFG Projects and start working on it.
Almost every IT giant whether it be Facebook, Amazon, Google, or any other ask various questions based on System Design concepts such as scalability, loadbalancing, caching, etc. in the interview.
This specifically designed System Design tutorial will help you to learn and master System Design concepts in the most efficient way from basics to advanced level.
Note: We will start uploading videos soon.
You can prepare for several types of interviews here. For instance, if you want to prepare for a Google interview, we have an SDE sheet specifically designed for that purpose. Here we attached the links to the top 5 product based and top 5 Service based preparation SDE Sheets.
Product Based Company SDE Sheets
Service Based Company SDE Sheets
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