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SCHOOL (2)
BASIC (58)
EASY (154)
MEDIUM (113)
HARD (13)
- Longest Even Length Substring
- Sorting Elements of an Array by Frequency
- Nearly Sorted Algorithm
- Rotate a Linked List
- Add Number Linked Lists
- Add 1 to a Linked List Number
- Detect Loop in linked list
- Quick Sort on Linked List
- QuickSort on Doubly Linked List
- Count BST nodes that lie in a given range
- Check for BST
- Delete without head pointer
- Diameter of a Binary Tree
- Sum Tree
- Implement stack using array
- Directed Graph Cycle
- LCA in Binary Tree
- Absolute List Sorting
- Two Stacks in an Array
- Largest subarray with 0 sum
- Gas Station
- Check if subtree
- Kth smallest element in a Matrix
- Validate an IP Address
- Remove loop in Linked List
- Largest BST
- Multiply two strings
- Palindrome Linked List
- Count distinct elements in every window
- Merge k Sorted Arrays
- Find triplets with zero sum
- k-th Smallest in BST
- Level order traversal
- Peak element
- Merge Sort for Linked List
- Union of Two Linked Lists
- Populate Inorder Successor for all nodes
- Counting elements in two arrays
- Foldable Binary Tree
- Construct Tree from Inorder & Preorder
- Diagonal sum in binary tree
- Median of BST
- ZigZag Tree Traversal
- Maximum Non-Adjacent Nodes Sum
- Reverse array in groups
- Maximum occured integer
- Wave Array
- Possible Words From Phone Digits
- Rearrange an array with O(1) extra space
- Stock buy and sell
- Rotate Array
- Kadane's Algorithm
- Binary Array Sorting
- Indexes of Subarray Sum
- Subarray with 0 sum
- Longest Consecutive Subsequence
- Stock span problem
- Infix to Postfix
- K Sized Subarray Maximum
- Kth smallest element
- Minimum Cost of ropes
- Activity Selection
- Job Sequencing Problem
- Largest number in K swaps
- Minimum Jumps
- Stickler Thief
- Egg Dropping Puzzle
- Zero Sum Subarrays
- Shortest Common Supersequence
- Count subsequences of type a^i, b^j, c^k
- Print Anagrams Together
- Overlapping Intervals
- Sort 0s, 1s and 2s
- Paths to reach origin
- Maximum Index
- Pair array product sum
- Equivalent Sub-Arrays
- Single Among Doubles in a Sorted
- Count Occurences of Anagrams
- Pythagorean Triplet
- Mr Modulo and Pairs
- Sum of bit differences
- Efficiently sorting numbers in range from 0 to n^2 - 1
- Super Primes
- Maximum Product Subarray
- Row with max 1s
- Max value after m range operation
- Sort in specific order
- Nuts and Bolts Problem
- Rotate a Matrix
- Next Smaller Element
- Count the Reversals
- k largest elements
- Longest Common Substring
- Rod Cutting
- Longest Common Increasing Subsequence
- First negative in every window of size k
- Find the number of subarrays having even sum
- Palindrome in Alphanumeric String
- Permutations of a String
- Subsequence matching
- Subarrays Product Less than K
- Unique Number II
- Max Sum Increasing Subsequence
- Coin Change (Count Ways)
- Power Set
- Partition Equal Subset Sum
- Array Pair Sum Divisibility Problem
- Return two prime numbers
- Find Prime numbers in a range
- Game with String
- Maximum sum leaf to root path
- IPL 2021 - Match Day 2
- SP - BST Traversal
- Reverse a linked list
- Frequency in a Linked List
- Linked list of strings forms a palindrome
- Compare two linked lists
- Split a Linked List into two halves
- Inorder Traversal
- Reverse a Doubly Linked List
- K distance from root
- Mirror Tree
- Maximum Width of Tree
- Height of Binary Tree
- Balanced Tree Check
- Middle of a Linked List
- Check If Circular Linked List
- Left View of Binary Tree
- Find Transition Point
- Postorder Traversal
- DFS of Graph
- Insert a node in a BST
- BFS of graph
- Identical Trees
- Binary Search
- Run Length Encoding
- Minimum Depth of a Binary Tree
- Odd even level difference
- Equilibrium index of an array
- Convert to Roman No
- Search a node in BST
- Expression Tree
- Max distance between same elements
- Count Occurrence of digit k
- Delete in a Singly Linked List
- Max Level Sum in Binary Tree
- Special Stack
- Index of an Extra Element
- Sum of given range
- Convert Ternary Expression to Binary Tree
- Play with an array
- Minimum element in BST
- Sum of leaf nodes in BST
- Max and min element in Binary Tree
- XOR of a given range
- Full Binary Tree
- Symmetric Tree
- Delete Alternate Nodes
- Find the Sum of Last N nodes of the Linked List
- Count Pairs whose sum is equal to X
- Linked List Matrix
- Maximum Pairwise Computed Value
- Height of Spiral Tree
- Sum of Leaf Nodes
- Tilt of Binary Tree
- Rotate doubly Linked List
- Product of an Array
- Learn to Comment - Java
- nextLine and next
- Swap the array elements
- Count the Specials
- Matrix Interchange
- Predict the Column
- Matrix Interchange - Java
- Predict the Column - Java
- Structs and Objects
- Learning Structs
- Delete Array
- Sum of Big Integers
- BigInteger Multiply
- BigInteger mod
- Find the Frequency
- Java ArrayList Operation
- Reverse an Array
- First Set Bit
- Equilibrium Point
- Array Leaders
- Floor in a Sorted Array
- Roof Top
- Print Matrix in snake Pattern
- Transpose of Matrix
- Check if a string is Isogram or not
- Anagram
- String Rotated by 2 Places
- Reverse Words
- Sum of numbers in string
- Parenthesis Checker
- N meetings in one room
- Union of Arrays with Duplicates
- Missing in Array
- Roman Number to Integer
- Minimum Energy
- Pairs which are Divisible by 4
- Adding Ones
- Maximum no of 1's row
- Search in a Row-Column sorted matrix
- Equal Sum and Product
- Min sum formed by digits
- Min Subsets with Consecutive Numbers
- Minimize the sum of product
- Chocolate Distribution Problem
- Maximum Sum Bitonic Subsequence
- Drive the car
- Bitonic Point
- Left most and right most index
- Count increasing Subarrays
- Remove Consecutive Characters
- Addition of submatrix
- Sherlock a Detective
- Arya's Long String
- Remove Duplicates
- Greater on right side
- Convert array into Zig-Zag fashion
- Two Sum - Pair with Given Sum
- Find all pairs with a given sum
- Number of occurrence
- Pair the minimum
- Convert an array to reduced form
- Largest Fibonacci Subsequence
- Sum of distinct elements for a limited range
- Counts Zeros Xor Pairs
- Two sum -Pairs with 0 Sum
- Sum of f(a[i], a[j]) over all pairs in an array of n integers
- Segregate 0s and 1s
- Inverse Permutation
- Play With OR
- Element with left side smaller and right side greater
- Find the closest pair from two arrays
- The Inverting Factor
- Count the Zeros
- Total distance travelled in an array
- Sum of Lengths of Non-Overlapping SubArrays
- Four Elements
- Palindrome String
- Palindromic Series
- Sorting all array elements except one
- Unique DigitSum
- Fitting The Array
- K-th missing element
- Pair with given sum in a sorted array
- Minimum changes to make all substrings distinct
- Karatsuba Algorithm
- Divisibility by 8
- Number of 1 Bits
- Love For The Twins
- Set Bits
- Element that appears once where every element occurs twice
- Print binomial expansion series
- Maximize Toys
- Largest number possible
- Page Faults in LRU
- Trailing zeroes in factorial
- Form a number divisible by 3 using array digits
- Recursive sequence
- Overlapping rectangles
- Sum of dependencies in a graph
- Rotate Array
- Sort String
- Find Length of Linked List
- Size of Binary Tree
- Count Leaves in Binary Tree
- Replace all 0's with 5
- Count zeros in a sorted matrix
- Print number pattern
- Preorder Traversal
- Anagram of String
- Circular Linked List Traversal
- Is Linked List Length Even?
- Identical Linked Lists
- Sum of Binary Tree
- longest substring containing '1'
- Alternates in an Array
- Sort and Reverse Vector
- Bit Difference
- Binary String
- Binary Array Sorting
- Remove consonants from a string
- Balanced Array
- Type of array
- Make Co-prime Array
- Maximum product of two numbers
- Value equal to index value
- Fighting the darkness
- Count Pairs Odd Xor
- Sum of distinct elements
- Repeated Character
- First 1 in a Sorted Binary Array
- Find the Number which contain the digit d
- The Penalty Shootout
- Game with nos
- Ishaan Loves Chocolates
- Array Subset
- Rotating an Array
- Minimum number to form the sum even
- Count of smaller elements
- Min and Max in Array
- Reducing Walls
- Multiply left and right array sum
- Maximum Perimeter of Triangle from array
- Average Count Array
- Extract Maximum
- GCD of Array
- Check set bits
- Binary representation
- Set kth bit
- Find the fine
- Power of Pow | Odd Numbers
- Absolute Difference of 1
- Java 1-d and 2-d Array
- C++ 2-D Arrays | Set-2
- Find the position of M-th item
- Print the Kth Digit
- Doctors Clinic
- Sorted matrix
- Linked List Group Reverse
- Reorder List
- Maximum subset XOR
- Merge Sort on Doubly Linked List
- Trapping Rain Water
- Minimum Cost Path
- Merge Without Extra Space
- Count Pairs in an Array
- Count Smaller elements
- Largest rectangle of 1s with swapping of columns allowed
- Sum-string
- Longest valid Parentheses
- Maximum sum Rectangle