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Programming Interview Questions

If you are someone who is preparing for a Software Developer interview then this page might helpful for you. The typical software developer interview process contains 5-6 rounds of interviews, including online coding tests, DSA rounds, and Design rounds.

Things you need to do before appearing for interviews:

1. Prepare your Resume and Projects
2. Prepare one Programming Language very well. [ Java / C++ / Python ]
3. Prepare Data Structures and Algorithms
4. Prepare CS Topics like OS, Network, DBMS.
5. Prepare System Design [ LLD, HLD]
6. Leadership Questions / HR round.

This page contains the data structures and algorithms programming questions that are very important and commonly asked in interviews. I have added these questions category-wise for better readability.

Arrays

• Move Zeroes
• Minimum Size Subarray Sum
• Two Sum 2(Array Sorted)
• Two Sum
• 3Sum Problem
• Find the first and the last position of an element in a sorted array
• First Missing Positive
• Repeat and missing number array
• Noble Integer
• Max Sum Contiguous Subarray
• Add One To Number
• Plus One
• Max Non-Negative SubArray
• Flip
• Pascal Triangle
• Kth Row of Pascals's Triangle
• Triplets With Sum between the given range
• Find Pivot Index
• The Largest number at least Twice of Others
• Rotate Array
• Remove Duplicates from Sorted Array
• Median of Two Sorted Arrays(log(n))
• The Intersection of Two Arrays
• How to Count Set Bits
• Find the First Duplicate in an Array
• Find Second Largest Element in Array
• How Many Numbers Are Smaller than the Current Number in an array
• Sort an Array According to Count of Set Bits
• Count Number of Inversions in an array
• Majority Element

Matrix

• Spiral Order Matrix 1
• Spiral Order Matrix 2
• Anti Diagonals
• Diagonal Traverse
• How to check if given sudoku is valid or not
• Rotate Image

String

• Add Binary
• Longest Common Prefix
• Valid Parentheses
• Evaluate Reverse Polish Notation
• Implement strStr() or indexOf()
• Reverse a String in Java
• Reverse Words in a String
• Reverse Words in a String(Word)
• First Unique Character in a String
• Longest Substring Without Repeating Characters
• Find Number of Substrings with the count of each character as K
• First Not Repeating Character in a String

Linked Lists

• Detect Cycle in a Linked List
• Find First Node of Cycle in a Linked List
• The Intersection of Two Linked List
• Remove Nth Node from the end of Linked List
• Reverse a Linked List
• Remove linked list Elements
• Odd-Even Linked List
• Check if the given linked list is Palindrome or not
• Add two numbers represented as Linked Lists
• Merge two sorted linked lists
• Merge k Sorted Lists
• Rotate a linked List
• Flatten a Multilevel Doubly Linked List
• Copy a Linked List with Random Pointer
• Sort a linked list using insertion sort
• Remove Duplicates from Sorted Linked List
• How to Find the middle element in a linked list

Stacks

Queue

Tree

• Height of a Binary Tree
• Find Minimum Depth of a Binary Tree
• Invert a binary tree
• Count Unique Binary Search Trees
• Generate Unique Binary Search Trees Using Recursion
• Validate Binary Search Tree
• Connect Nodes at the same level in Binary Tree
• Maximum Depth of N-ary tree

Heap

Hash Set

Hash Map

Graph

Maths

Recursion

Bit Manipulation

Searching Algorithms

• Find Number of Islands
• Check if the given number is perfect square or not
• Implement sqrt function using binary search
• Search in Rotated Sorted Array

Sorting Algorithms

Union-Find

Two-Pointers

Sliding Window

Greedy Algorithms

Dynamic Programming

Others

Resources

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