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BASIC (17)
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MEDIUM (87)
HARD (13)
- Reverse alternate nodes in Link List
- Merge 2 sorted linked list in reverse order
- Detect Loop in linked list
- Delete without head pointer
- Multiply two strings
- BST with Dead End
- Duplicate Subtree
- Find Common Nodes in two BSTs
- Peak element
- Euler circuit and Path
- Binary Tree to CDLL
- K Sum Paths
- Leftmost and rightmost nodes of binary tree
- Isomorphic Trees
- Normal BST to Balanced BST
- Mother Vertex
- Power Of Numbers
- Wave Array
- Maximum Index
- Rotate Array
- Kadane's Algorithm
- Majority Element
- Level of Nodes
- Make Matrix Beautiful
- Boolean Matrix
- Determinant of a Matrix
- Subarray with 0 sum
- Strings Rotations of Each Other
- Detect Cycle using DSU
- Stickler Thief
- Lucky Numbers
- Kth Smallest
- Shortest Common Supersequence
- Top K Frequent in Array
- 4 Sum - All Quadruples
- Pascal Triangle
- Number of subarrays with maximum values in given range
- Sum of Middle elements of two sorted arrays
- Single Among Doubles in a Sorted
- Consecutive 1's not allowed
- Pythagorean Triplet
- Painting the Fence
- Form the Largest Number
- Longest subarray with sum divisible by K
- Check if frequencies can be equal
- Column name from a given column number
- Substrings with K Distinct
- Max Sum without Adjacents
- Shuffle integers
- Find the N-th character
- Sum of XOR of all pairs
- Longest Substring with K Uniques
- Largest Sum Subarray of Size at least K
- Minimize the Heights II
- Transform to prime
- First and Last Occurrences
- Minimum Deletions
- Number following a pattern
- Bleak Numbers
- Game of XOR
- Modified Game of Nim
- Max Sum Increasing Subsequence
- Gold Mine Problem
- Perfect Sum Problem
- Fibonacci Sum
- Knapsack with Duplicate Items
- Partition Equal Subset Sum
- Count possible ways to construct buildings
- Array Pair Sum Divisibility Problem
- Number of paths
- Smith Number
- How Many X's?
- Transitive closure of a Graph
- Replace O's with X's
- Find the string in grid
- Techfest and the Queue
- Anti Diagonal Traversal of Matrix
- Unique Number III
- Maximum Meetings in One Room
- Buy Maximum Stocks
- Minimum Multiplications to reach End
- Number Of Enclaves
- Eventual Safe States
- Maximum Sum Combination
- Floor in BST
- Empty the String
- Is it possible to sort the array?
- Pairwise swap elements of a linked list
- Delete nodes having greater value on right
- Reverse a Doubly Linked List
- Bubble Sort
- Height of Binary Tree
- Balanced Tree Check
- Middle of a Linked List
- Intersection Sorted Linked Lists
- Find Transition Point
- Remove Duplicates from a Sorted Linked List
- Insert a node in a BST
- Identical Trees
- Square Root
- Binary Search
- Remove Duplicates Sorted Array
- Binary Tree to BST
- Delete in a Singly Linked List
- Kth largest element in BST
- Minimum distance in an Array
- Array Duplicates
- Index of an Extra Element
- Insert in a Sorted List
- More than n/k Occurrences
- Reverse Using Stack
- Symmetric Tree
- Leaf under budget
- Brothers From Different Roots
- Swap the array elements
- Predict the Column
- First Set Bit
- Rightmost different bit
- Check K-th Bit
- Power of 2
- Frequencies in a Limited Array
- Equilibrium Point
- Array Leaders
- Print adjacency list
- Sum of upper and lower triangles
- Print Matrix in snake Pattern
- Matrix Boundary Traversal
- Anagram
- String Rotated by 2 Places
- Isomorphic Strings
- Reverse Words
- Count number of hops
- Union of Arrays with Duplicates
- Check Equal Arrays
- Missing in Array
- Roman Number to Integer
- Missing And Repeating
- Non-Repeating Element
- Common in 3 Sorted Arrays
- Move All Zeroes to End
- String Duplicates Removal
- Bitonic Point
- Sort Array II
- Alternate Positive Negative
- Remove Duplicates
- Second Largest
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Rotate Bits
- Number of occurrence
- String's Count
- At Least K Occurrences
- Find the closest pair from two arrays
- Palindrome String
- Minimum Operations
- Number of 1 Bits
- Reverse Bits
- Max Sum Subarray of size K
- Nth Fibonacci Number
- Shortest path from 1 to n
- Sum 1 to n Divisors
- Reach the Nth point
- Number Of Open Doors
- Perfect Numbers
- Largest number possible
- Form a number divisible by 3 using array digits
- Surround the 1's
- Inorder Traversal and BST
- Letters Collection
- Print Pattern
- Sum of dependencies in a graph
- Absolute difference divisible by K
- Wave Array
- Smallest window containing 0, 1 and 2
- Weird Island
- Construction of a string
- Strong Students in School
- Find Length of Linked List
- Array Search
- Reverse a String
- First n Fibonacci
- C++ Hello World
- Sum of Natural Numbers
- Uncommon characters
- Repeated Character
- Elements in the Range
- Largest Element in Array
- One odd Occuring
- Min and Max in Array
- C++ Input / Output
- Check for Power
- Leap Year
- Factorial
- Repetitive Addition Of Digits