DSA, High & Low Level System Designs
0% Completed
Data Structures & Algorithms
Number Theory
Master core number theory concepts like factors, GCD/LCM, primes, exponentiation, modulo arithmetic, nCr, sieves, and competitive problem-solving with real test practice.
Number of Common Factors
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Add Two Integers
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Product of factors of number
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Repeating GCD
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Exponentiation
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Factorial
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GCD & LCM
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Prime Numbers and Primality Check
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Sieve of Eratosthenes
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Binary Exponentiation
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Modulo Arithmetic
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Inverse Modulo
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nCr Computations using inverse modulo
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Find all factorial numbers less than or equal to N
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GCD, LCM and Distributive Property
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Product of Prime Factors
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Find Prime numbers in a range
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HackerRank Test
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Math
Build strong problem-solving skills with math-based algorithms covering numbers, dates, patterns, primes, and real coding test challenges.
Plus One
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Sqrt(x)
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Power of Four
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Excel Sheet Column Title
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Reverse Integer
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Factorial Trailing Zeroes
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Fibonacci Number
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Palindrome Number
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Check If It Is a Straight Line
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Count Days Spent Together
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Minimum Sum of Four Digit Number After Splitting Digits
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Day of the Year
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Subtract the Product and Sum of Digits of an Integer
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Prime Arrangements
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HackerRank Test
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Bit Manipulation
Learn to solve problems using bitwise operations like XOR, set bits, Hamming distance, and efficient binary tricks with test-based practice.
Single Number
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XOR Operation in an Array
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Sum of All Subset XOR totals
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Convert a number to hexadecimal
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Prime Number of Set Bits in Binary Representation
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Maximum XOR of Two Numbers in an Array
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XOR Queries of a Subarray
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Total Hamming Distance
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Single Number II
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Find Sum Of Different Corresponding Bits For All Pairs
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Divide Two Integers
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Bitwise ORs of Subarrays
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Bit Manipulation Quiz
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HackerRank Test
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Searching (Beginner)
Learn essential searching techniques like binary search, array and matrix search, rotations, medians, and optimization problems with hands-on practice and tests.
sqrt(x)
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Binary Search
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Intersection of Two Array II
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Count Negative Numbers in a Sorted Matrix
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Check if Array is Sorted and Rotated
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Rotate String
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Find Peak Element
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Single Element in a Sorted Array
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Minimum Swaps to Sort
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Matrix Median
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Search in Rotated Sorted Array
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Minimum Size Subarray Sum
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Maximum Height Of The Staircase
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Median Of Two Sorted Arrays
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Searching Quiz
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HackerRank Test
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Searching (Advanced)
Learn essential searching techniques like binary search, array and matrix search, rotations, medians, and optimization problems with hands-on practice and tests.
Reach a Number
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Most Profit Assigning Work
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Ways to Split Array Into Three Subarrays
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Plates between Candles
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Aggressive Cows
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Smallest Good Base
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Allocate Books
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Nth Magical Number
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Painters Partition Problem
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Matrix Search
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Rotate Image
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Find Minimum In Rotated Sorted Array
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HackerRank Test
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Recursion
Understand recursion through classic problems like permutations, subsets, combinations, and game-based logic, with quizzes and test practice.
Fibonacci Number
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Power of Four
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Merge Two Sorted Lists
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Power of Two
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All Unique Permutations
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Combination Sum
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Permutations
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Subsets
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Combination Sum ii
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Gray Code
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Subsets ii
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Permutation Sequence
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Find the Winner of the Circular Game
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Recursion Quiz
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HackerRank Test
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Backtracking
Learn systematic search using backtracking to generate combinations, permutations, paths, and constraint-based solutions with test practice.
Sum of All Subset XOR Totals
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Binary Watch
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Letter Tile Possibilities
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Generate Parantheses
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Unique Paths III
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NQueens
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Permutations II
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Number Of Squareful Arrays
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Palindrome Partitioning
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Gray Code
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N-Queens II
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Numbers With Same Consecutive Differences
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Backtracking Quiz
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HackerRank Test
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Sorting (Beginner)
Learn basic sorting techniques and apply them to array-based problems, comparisons, and simple optimizations with quizzes and test practice.
Third Largest Number
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Sort Array By Parity II
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How Many Numbers are smaller than the current Number?
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Fair Candy Swap
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K Closest Points to Origin
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Maximum Difference
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Maximum Difference Between Increasing Elements
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Number of sextuplets
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Corporate Flight Bookings
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Chocolate Distribution Problem
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Sum Special Triplets Elements 3 Arrays
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Find Right Interval
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Sorting Algorithms Quiz
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HackerRank Test
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Sorting (Advanced)
Master advanced sorting techniques and counting-based problems like inversions, range sums, permutations, and optimized rearrangements with interview-level practice.
Find the Distance value between Two Arrays
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Merge Similar items
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Split with Minimum Sum
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Sort Even and Odd Indices Independently
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Count of smaller numbers after self
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Count of Range Sum
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Reverse pairs
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Lexicographically largest permutation of the array such that a[i] = a[i-1] + gcd(a[i-1], a[i-2])
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Possible Arrangement Of Persons Waiting To Sit In A Hall
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Inversion count in an array
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Max Chunks To Make Sorted II
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Reducing Dishes
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HackerRank Test
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Two Pointer
Learn the two-pointer technique to efficiently solve array and string problems involving pairs, windows, water trapping, and optimization.
Find the Index of the First Occurrence in a String
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Is Subsequence?
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Check if N and its Double exist
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Squares of a Sorted Array
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Count of pairs with the given sum
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Minimum Size Subarray Sum
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Minimize the absolute difference
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Smallest sequence with given Primes
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Container With Most Water
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Given Two Sorted Arrays Number X Find Pair Whose Sum Closest X
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Counting Triangles
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Trapping Rain Water
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Longest Chunked Palindrome Decomposition
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Two-Pointer Approach Quiz
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HackerRank Test
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Hashing (Beginner)
Learn how hashing simplifies problem-solving using maps and sets for fast lookups, subarrays, frequency counting, and pattern detection.
Two Sum
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Find the Difference
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Fair Candy Swap
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Maximum Number of Ballons
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Subarray with 0 sum
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Subarray Sum Equals K
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Largest Continuous Sequence Zero Sum
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Longest Consecutive Sequence
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Equal
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Anagrams
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Valid Sudoku
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Set Matrix Zeros
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Find Pairs In Array Whose Sums Already Exist In Array
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Hashing Quiz
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Hashing (Advanced)
Master advanced hashing techniques to solve string, geometry, window-based, and randomized problems with interview-level efficiency.
Check if N and its Double exist
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How many Numbers are Smaller than the current number
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Sum of Unique Elements
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Decode the Message
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Palindrome Pairs
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Window String
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Longest Substring Without Repeat
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Points on same line
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Count Right Triangles
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Diffk ii
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Grid Illumination
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Find rectangle with corners as 1
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Random Pick with Blacklist
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HackerRank Test
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Strings
Master string manipulation concepts including patterns, palindromes, conversions, parsing, and comparisons with practical problem-solving and tests.
Repeated Substring Pattern
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Valid Palindrome II
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Find Common characters
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Check if a word occurs as a Prefix of any word in a sentence
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Day of the Year
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Longest Common Prefix
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Compare Version Numbers
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Compare Version Numbers
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Reverse the String
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Implement Strstr
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Integer To Roman
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Roman To Integer
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Pretty Json
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String Operations Quiz
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HackerRank Test
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Stacks
Master stack-based problem solving through real coding questions, advanced patterns, quizzes, and HackerRank-style tests.
Valid Parentheses
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Next Greater Element I
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Number of Students unable to eat Lunch
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Remove all Adjacent Duplicates in String
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Evaluate Expression
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Min Stack
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Largest Rectangle in Histogram
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Trapping Rain Water
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Nearest Smaller Element
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Brace Expansion II
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Maximal Rectangle
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Stack Operations Quiz
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Stack Operations Quiz
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HackerRank Test
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Queues
Learn queue-based problem solving with real-world coding questions, sliding window patterns, quizzes, and HackerRank tests.
Implement Stack using Queues
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First Unique Character in a String
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Implement Queue using Stacks
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Time needed to Buy Tickets
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Sum of min and max
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Reversing the first K elements of a Queue
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N integers containing only 1, 2 & 3
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Gas Station
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Sliding Window Maximum
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Given A String Find Its First Non Repeating Character
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Max Value of Equation
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Shortest Subarray with Sum at Least K
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Queues Quiz
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HackerRank Test
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Linked List (Beginner)
Build strong linked list fundamentals through classic problems, pointer techniques, quizzes, and HackerRank tests.
Merge Two Sorted Lists
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Palindrome Linked List
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Intersection of Two Linked Lists
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Middle of the Linked List
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Remove Nth Node From End of List
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List Cycle
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Reverse Linked List Ii
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Populating Next Right Pointers in Each Node
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Linked List Quiz
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HackerRank Test
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Linked List (Advanced)
Master advanced linked list designs and transformations with complex problems, in-place algorithms, and real system-style questions.
Design Hashmap
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Remove Duplicates from Sorted List
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Linked List Cycle
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Merge Two Sorted Lists
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Flatten a Multilevel Doubly Linked List
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Clone a Linked List
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Intersection of Linked Lists
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Remove Duplicates From Sorted List ii
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Remove Duplicates From Sorted List
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Length Longest Palindrome List Linked List Using O(1) Extra Space
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Design a Text Editor
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Linked List Quiz 2
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Trees (Beginner)
Learn binary tree fundamentals with traversal techniques, construction problems, depth checks, and hands-on practice tests.
Same Tree
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Maximum Depth of Binary Tree
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Binary Tree Inorder Traversal
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Binary Tree Preorder Traversal
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Binary Tree Postorder Traversal
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Binary Tree From Inorder And Postorder
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Balanced Binary Tree
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Check Tree Traversal
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Binary Tree Zigzag Level Order Traversal
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Construct Binary Tree From Preorder And Inorder Traversal
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Binary Tree Level Order Traversal
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Populating Next Right Pointers in Each Node
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HackerRank Test
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Trees (Intermediate)
Strengthen tree problem-solving with symmetry checks, views, transformations, traversals, and serialization techniques.
Symmetric Tree
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Invert Binary Tree
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Binary Tree Tilt
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Evaluate Boolean Binary Tree
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Vertical Order traversal
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Binary Tree Right Side View
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Sum Tree
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2-Sum Binary Tree
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TOP VIEW
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Boundary Traversal Of Binary Tree
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Add One Row to Tree
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Serialize and Deserialize Binary Tree
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Trees & BST
Solve core tree and BST problems covering traversal, validation, construction, LCA, path sums, and optimization patterns.
Convert Sorted Array to BST
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Find Mode in BST
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Minimum Absolute difference in BST
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Two Sum IV - Input is a BST
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Search in a BST
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Kth Largest Element in a Stream
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Recover Binary Search Tree
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Sorted Array To Balanced BST
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BST Iterator
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Left view of binary tree
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Least Common Ancestor
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Invert the Binary Tree
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Valid Binary Search Tree
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Binary Tree to CDLL
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Sum Root To Leaf Numbers
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Symmetric Binary Tree
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Identical Binary Trees
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Path Sum
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BST (Advanced)
Deep dive into advanced BST problems focusing on distance queries, range operations, traversals, and complex tree paths.
Minimum Distance between BST nodes
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Increasing order BST
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Range Sum of BST
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Leaf nodes from Preorder of a Binary Search Tree
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Odd even level difference
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Minimum Distance between Nodes of BST
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Boundary Traversal Of Binary Tree
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2sum Binary Tree
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Binary Tree Paths
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All Nodes Distance K In Binary Tree
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Binary Search Tree (BST) Quiz
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Heap
Learn heap-based problem solving for top-K elements, priority queues, scheduling, and real interview-style challenges.
Take Gifts from the Richest Pile
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Delete greatest value in each row
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Make Array zero by Subtracting equal amounts
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Minimum amount of time to fill cups
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N max pair combinations
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Kth Largest Element in an Array
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Merge k Sorted Lists
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B Closest Points to Origin
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Ways To Form Max Heap
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Kth Largest Element In An Array
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Magician And Chocolates
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Sliding Window Median
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Binary Heap Quiz
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HackerRank Test
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Greedy
Understand greedy decision-making through optimization problems, scheduling strategies, and classic interview challenges.
Largest Perimeter Triangle
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Longest Palindrome
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Maximum Sum with exactly K elements
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Minimum Moves to convert string
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Maximize Sum Of Array After K Negations
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Assign Mice to Holes
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Seats
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Meeting rooms
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Job Sequencing Problem
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Task Scheduler
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Kth Smallest Element In A Sorted Matrix
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Minimum Number of Refueling Stops
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Reducing Dishes
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Greedy Algorithm Quiz
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Dynamic Programming (Beginner)
Learn DP fundamentals through classic problems like Fibonacci, stock trading, subsequences, and optimal decision making.
Pascal's Triangle
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Best time to Buy and Sell Stock
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Fibbonacci Number
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Best Time to Buy and Sell Stock II
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House Robber
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Climbing Stairs
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Length of Longest Fibonacci Subsequence
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Min Jumps Array
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Coins in a Line
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Longest Increasing Subsequence
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Tiling A Rectangle With The Fewest Squares
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Max Sum Without Adjacent Elements
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Dynamic Programming Quiz
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Dynamic Programming (Intermediate)
Strengthen DP skills with subsequences, grid paths, coin problems, pattern matching, and optimization techniques.
Pascal's Triangle II
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Counting Bits
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Is Subsequence?
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Perfect Squares
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Minimum cost for tickets
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Min Sum Path in Matrix
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Longest Palindromic Subsequence
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Longest Common Subsequence
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Longest Increasing Subsequence
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Unique Paths In A Grid
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Coin Sum Infinite
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Coins In A Line
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Regular Expression Matching
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Dynamic Programming Concepts
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Dynamic Programming (Advanced)
Master advanced DP with complex string problems, partitioning, optimization patterns, and multi-state interview challenges.
Divisor Game
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N-th Tribonacci Number
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Get Maximum in Generated Array
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Predict the Winner
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Maximum length of Pair Chain
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Longest String chain
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Minimum Time to make Rope colorful
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Nth Fibbonacci Number
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Get Maximum in Generated Array
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Divisor Game
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Edit Distance
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Word Break
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Regular Expression Matching
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Regular Expression ii
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Interleaving String
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Palindrome Partitioning II
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Longest Palindromic Substring
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Matrix chain multiplication
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Unique Binary Search Trees ii
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Tushars Birthday Party
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Distinct Subsequences
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Evaluate Expression To True
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Russian Doll Envelopes
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Word Break II
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Palindrome Partitioning II
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Word Break
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Stock Trading Dynamic Programming Problems
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Graph (Beginner)
Learn graph fundamentals through traversal, connectivity, shortest paths, grid-based problems, and core graph concepts.
Find if Path exists in Graph
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Find Center of Star Graph
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Island Perimeter
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Minimum Depth of Binary Tree
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Rotting Oranges
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Capture Regions on Board
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Black Shapes
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Frog Position After T Seconds
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Smallest Multiple With 0 And 1
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Number Of Islands
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Jump Game IV
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Shortest Path Visiting All Nodes
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Graph Theory Concepts
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Graph Types and Algorithms
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Graph (Advanced)
Solve advanced graph problems using shortest paths, topological sorting, connectivity checks, and classic interview algorithms.
Min Cost to Connect All points
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Find All Possible recipes from Given Supplies
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All Ancestos of a Node in a Directed Acyclic Graph
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Number of Provinces
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Possibility of finishing all courses given pre-requisites
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Commutable Islands
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Knight On Chess Board
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Dijkstra
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Word Ladder I
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Word Ladder II
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Is Graph Bipartite?
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Graph Algorithms
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Trie
Learn trie-based techniques for prefix matching, XOR optimizations, substring detection, and advanced string problems.
Segment Tree
Understand segment trees for efficient range queries, updates, and solving complex interval-based problems.
Low Level System Design
Low Level Design (Basic Building Blocks)
Learn core LLD concepts like inheritance, association, composition, aggregation, with a quick quiz to test understanding.
Solid Principles
Understand SOLID principles to design clean, scalable, and maintainable systems, with a quiz to reinforce concepts.
Creational Design Patterns
Learn object creation patterns like Factory, Builder, Singleton, and more, with a quiz to test understanding.
Structural Design Patterns
Learn patterns like Adapter, Decorator, Facade, and Bridge to structure flexible systems, with a quiz to test understanding.
Behavioural Design Patterns
Understand interaction-focused patterns like Command, Observer, State, and Strategy, with a quiz to test concepts.
LLD Topics
Pizza factory
Design a Pizza Factory system from requirements to diagrams, code implementation, and interview Q&A.
SQL Query builder
Design an SQL Query Builder from requirements to diagrams, code implementation, and interview Q&A.
Logger
Design a Logger system covering requirements, diagrams, code, and interview Q&A
Introduction & Class Diagram
Video - 00:3:03 mins
Code Part 01
Video - 00:10:46 mins
Singleton Logger
Video - 00:2:38 mins
Code Part 02
Video - 00:2:02 mins
Requirements
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Identification of actors
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Use case diagram
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Class diagram
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QnA
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Activity Diagram
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Code
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Car Price Calculator
Design a Car Price Calculator from requirements to diagrams, code implementation, and interview Q&A.
Car Price Calculator LLD Chapter 1
Video - 00:00:00 mins
Car Price Calculator LLD Chapter 2
Video - 00:00:00 mins
Car Price Calculator LLD Chapter 3
Video - 00:00:00 mins
Car Price Calculator LLD Chapter 4
Video - 00:00:00 mins
Car Price Calculator LLD Chapter 5
Video - 00:00:00 mins
Requirements
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Identification of actors
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Use case diagram
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Class Diagram
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QnA
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Activity Diagram
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Code
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Weather Station
Design a Weather Station system from requirements to diagrams, code implementation, and interview Q&A.
Ticket management system
Design a Ticket Management System from requirements to diagrams, code implementation, and interview Q&A.
Payment processor
Design a Payment Processor from requirements to diagrams, code implementation, and interview Q&A.
Payment Processor LLD Chapter 1
Video - 00:2:47 mins
Payment Processor LLD Chapter 2
Video - 00:3:48 mins
Payment Processor LLD Chapter 3
Video - 00:6:51 mins
Payment Processor LLD Chapter 4
Video - 00:9:10 mins
Requirements
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Identification of actors
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Use case diagram
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Class diagram
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QnA
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Activity Diagram
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Code
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Elevator System
Design an Elevator System from requirements to diagrams, code implementation, and interview Q&A.
Car parking
Design a Car Parking system covering requirements, diagrams, services, logging, design patterns, and complete code implementation.
Introduction Video
Video - 00:00:55 mins
Use Case Diagram
Video - 00:3:44 mins
Class Diagram
Video - 00:6:07 mins
Class Diagram continued
Video - 00:5:30 mins
Services
Video - 00:9:57 mins
Parking Service
Video - 00:8:00 mins
Discussion on Parking Spots and Parking Service
Video - 00:8:12 mins
Activity Diagram
Video - 00:4:17 mins
Coding Part 1
Video - 00:34:46 mins
How to add Logging in the system
Video - 00:6:03 mins
Coding Part 2 (Adding Logging in the system)
Video - 00:6:03 mins
Implementing Parking pots using Decorator Design pattern
Video - 00:2:35 mins
Coding Part 3
Video - 00:12:12 mins
Requirements
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Identification of actors
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Use case diagram
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Class diagram
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QnA
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Activity Diagram
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Code
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Social media
Design a Social Media system from requirements to diagrams, code implementation, and interview Q&A.
WhatsApp
Design a WhatsApp-like system from requirements to diagrams, code implementation, and interview Q&A.
Amazon
Design an Amazon-like system from requirements to diagrams, code implementation, and interview Q&A.
PayPal
Design a PayPal-like payment system from requirements to diagrams, code implementation, and interview Q&A.
Assignment
Apply design patterns by implementing the Snakes and Ladders game end-to-end.
High Level Design
High Level Design ( Building Blocks )
Learn core HLD concepts like scalability, consistency, caching, databases, real-time systems, and GenAI-enabled APIs.
What is HLD?
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Consistent Hashing
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Caching
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Load Balancing
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CAP Theorem
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Indexes
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Redundancy and Replication
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SQL vs NoSQL
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Data Partitioning
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Long Polling and WebSockets
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Retrieval Augmented Generation (RAG)
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Gen AI-enabled API Systems
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Quorum
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TinyURL
Design a TinyURL system covering requirements, capacity planning, APIs, databases, caching, scaling, and testing.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High-Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Rate Limiter
Design a Rate Limiter covering requirements, capacity planning, APIs, data storage, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Typeahead suggestion (Google queries)
Design a Typeahead system covering requirements, capacity planning, APIs, data storage, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Pastebin
Design a Pastebin-like system covering requirements, capacity planning, APIs, databases, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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DropBox
Design a Dropbox-like system covering requirements, capacity planning, APIs, storage, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Instagram
Design an Instagram-like system covering requirements, capacity planning, APIs, databases, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Messenger
Design a Messenger system covering requirements, capacity planning, APIs, databases, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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BookMyShow
Design a BookMyShow-like ticketing system covering requirements, capacity planning, APIs, databases, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Uber/Ola
Design a ride-hailing system covering requirements, capacity planning, APIs, databases, real-time matching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Newsfeed
Design a Newsfeed system covering requirements, capacity planning, APIs, databases, caching, feed generation, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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Youtube/Netflix
Design a video streaming system covering requirements, capacity planning, APIs, storage, caching, scaling, and reliability.
Introduction
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Requirements & Goals of the System
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Capacity Estimations & Constraints
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System APIs
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Database design & Schema
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High Level Design
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QnA
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Purging & Db Cleanup
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Database Partitioning & Replication
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Cache & Load Balancing
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