• Find the Dublicate Number
• Sort an Array of 0's 1's and 2's without using extra space or sorting algorithm
• Repeat and Missing Number
• Merge Two Sorted Arrays
• Kadane's Algorithm
• Merge Overlapping Subintervals
• Find the duplicate in an array of N+1 integers.
• Set Matrix Zeros
• Pascal Triangle
• Next Permutation
• Inversion of an Array
• Rotate Matrix
• Stock Buy and Sell

• Search in a 2D matrix
• Pow(X,n)
• Majority Element (N/2 Elements)
• Majority Element (N/3 Elements)
• Grid Unique Paths

• 2 Sum Problem
• Longest Consecutive Sequence
• 4 Sum Problem
• Largest Sub Array with 0 Sum
• Count the number of subarrays having a given XOR
• Longest Substring without repeating Characters

• Reverse a Linked List
• Find the middle of Linked List
• Merge two sorted Linked List
• Remove N-th node from the back of LinkedList
• Delete a given node when a node is given
• Add two Numbers
• Find intersection point of Y Linked List
• Detect a cycle in Linked List
• Reverse Nodes in k-Group
• Palindrome Linked List
• Find the starting point of the Loop of LinkedList
• Flatenning a Linked List
• Rotate a Linked List
• Clone a Linked List with random and next pointer

• 3 sum
• Trapping rainwater
• Remove Duplicate from Sorted array
• Max Consecutive

• Inorder Traversal ( With Recursion & Without Recursion )

• N meeting in one room
• Minimum number of platforms required for a railway
• Job Sequencing Problem

Subset Sums

• Print all Permutations of a string/array