Placement preparation

Maximum Sum With No Two Adjacent Elements: DP Approaches Explained

Find the maximum sum of array elements with no two at adjacent indices. Recursive, memoised, and O(1)-space DP solutions with worked examples plus complexity analysis.

Find the Power of a Number: C, C++, Java, Python

Three approaches to computing the power of a number: iterative O(n), fast O(log n), and library calls. Code in C, C++, Java, and Python with edge-case notes.

Sum of Minimum Absolute Differences in an Array

Sort the array once to find each element's nearest neighbour in O(n log n) time. Python, C++, and C implementations with a worked example and edge case analysis.

Find the Total Number of Islands Using DFS

Count connected-component islands in a binary grid using DFS grid-coloring. Includes O(M×N) complexity proof, edge cases, and working C++, Java, Python code.

Vertical Sum in a Binary Search Tree: Algorithm and Code

Calculate the vertical sum of a BST by grouping nodes at the same horizontal distance. DFS and hashmap approach in Python and C++, with complexity analysis.

Fresher IT Jobs in Delhi NCR: 2026 Company and Application Guide

Cyber City Gurugram, Noida's IT corridor, and Connaught Place all hire IT freshers. Active employers, eligibility rules, and application routes for NCR in 2026.

Functions in Python: Practical Examples for Placement Prep

Functions in Python with examples: def keyword, arguments vs parameters, return values, recursion, *args/**kwargs, and the placement-test patterns interviewers reuse.

Python Generators: Generator Functions and Expressions with Examples

Learn how Python generators work, how yield differs from return, and why lazy evaluation matters in placement coding rounds and production pipelines.

Hello World in Python: Your First Program Explained

Learn to write and run a Hello World program in Python 3.14 using print(). Covers single quotes, double quotes, triple quotes, f-strings, and common beginner errors.

Hello World in Python: Your First Program (2026)

Run print("Hello World") in Python 3.13, understand why the Python 2 print statement breaks in Python 3, add an f-string variant, and spot three errors beginners make.

Variable Scope in C: Block, File, and Storage Class Rules

C has four kinds of variable scope. This guide covers block scope, file scope, storage classes, and the output puzzles that appear in placement tests.

10 May 2026 · 9 min read

How to Crack Verbal Ability in Placements: Test-Day Strategy

Test-day strategy for the verbal section in placement tests: attempt order, time-per-question, elimination heuristics, and a 7-day compressed plan.

How to Get a Job at Your Target Company in 2026

How engineering freshers can get hired at a specific target company, from profile building and referrals to company-specific interview prep.

How to Reverse a String in Python: Two Simple Methods

Reverse a string in Python with two methods: the slice idiom s[::-1] and an explicit while loop. Code, output, complexity, and the interview-grade choice.

How to Solve Quantitative Aptitude Problems Quickly

Classify first, calculate second. A four-step method for solving quantitative aptitude problems faster in TCS NQT, AMCAT, and campus placement tests.

Inheritance in Python: Types, MRO, and Working Examples

Python supports 5 inheritance types. This guide covers single, multiple, multilevel, hierarchical, and hybrid inheritance with MRO, super(), and placement-round patterns.

Insertion Sort in C, C++, Java: Code, Trace, Time Complexity

Insertion sort explained with a worked trace, full C, C++, and Java implementations, and the time complexity recruiters actually ask about.

10 May 2026 · 9 min read

Lambda Functions in Python: Syntax, map, filter, and Pitfalls

Learn Python lambda syntax, how to use it with map(), filter(), and sorted(), when to prefer def, and the late-binding pitfall that catches most beginners.

Study Plan for Placements: A Semester Template for Engineers

A structured, India-specific study plan for engineering students preparing for placements, with a week template that fits around internals, labs, and PPT season.

Multiply Two Numbers Between 10 and 20 in Three Steps

Multiply any two numbers between 10 and 20 using three mental steps. Derivation, four worked examples verified from first principles, and placement aptitude context.

Numbers in Python: Integer, Float and Complex Types

Python's three numeric types are int, float, and complex. Code examples cover each type, type conversion rules, and built-in math functions.

Opening and Closing Gates Validation Algorithm

Validate opening and closing gate pairs using a stack or counter to determine if people are safe. Python and C++ solutions with O(n) time complexity.

10 May 2026 · 4 min read

Binary Logic and Boolean Puzzles: Solved Examples for Placements

Learn to solve oxymoron-based binary logic puzzles with case-by-case elimination. Four worked examples covering truth-teller, liar, and alternator patterns.

Pointers and Arrays in C: How They Differ and Where They Don't

Arrays and pointers in C are not the same type, but they decay into each other in most expressions. Here is what that means in placement code.

Polymorphism in Python: Complete Guide

How Python implements polymorphism through duck typing, method overriding, operator overloading, and abstract base classes, with code examples for technical interviews.

10 May 2026 · 10 min read

Print n-th Term of Fibonacci Series in C, C++, and Java

Compute the n-th Fibonacci number in C, C++, and Java using iteration, recursion, DP, and matrix exponentiation. Full code with complexity notes.

Check If All Array Elements Can Be Made Equal (Multiply by 2 or 3)

Given an array, check whether all elements can be made equal by multiplying any element by 2 or 3. O(n log max) solution with code in C, C++, Java, and Python.

Program to Find Array Type (Even, Odd, or Mixed)

Single-pass algorithm to classify an array as all-even, all-odd, or mixed, with working C, C++, Java, and Python implementations and edge-case analysis.

Longest Subarray with Average ≥ k: O(n) Prefix-Sum Solution

Transform average ≥ k to sum ≥ 0, then use prefix sums and monotonic stack for O(n) time. Includes brute-force baseline, math derivation, and C++/Python code.

Toggle Each Character in a String: C, C++, Java, Python

C, C++, Java, and Python programs to toggle each character in a string. Covers the ASCII XOR bit-flip trick, isalpha() guard, and edge cases for placement coding tests.

Trace All Paths in a Directed Graph: DFS with Backtracking

Find every path between two nodes in a directed graph using DFS with backtracking. Python and C code included, with complexity analysis.

Python Built-In Modules: Key Ones for Placement Coding Rounds

Python's standard library ships over 200 modules accessible via import. Learn the five that appear most in placement coding rounds, with working code examples.

How to Install Python on Windows, Linux and macOS (2026)

Step-by-step Python 3.13 installation for Windows, Linux (apt, dnf, pacman), and macOS (Homebrew, official installer). Covers PATH setup and version verification.

Generate Random Numbers in Python: randint, choice, seed

Python's random module covers seven functions used in placement tests and projects. Covers randint, choice, sample, shuffle, uniform, seed, and the secrets module.

Recursion in Python: Concept, Examples, and Common Pitfalls

How recursion works in Python: base case, recursive case, call-stack mechanics, classic examples (factorial, Fibonacci, sum), depth limits, memoisation, and pitfalls.

Remove Duplicates from a Linked List: Sorted and Unsorted

Remove duplicates from sorted and unsorted linked lists. Covers single-pass O(n)/O(1) for sorted, HashSet and nested-loop for unsorted, with C++ and Python code.

Solving Sudoku Using Backtracking

Learn to solve Sudoku with backtracking in C++ and Python. Covers the is_safe() check, recursive solver structure, O(9^m) time complexity, and MRV optimisation.

Sort a Stack Using a Temporary Stack and Recursion

Two ways to sort a stack using only push and pop: the temp-stack method (iterative) and recursion (sortStack + insertSorted). Both O(n²). C++ and Python code.

Speed Reading for Placement RC: 5 Techniques That Work

Learn 5 evidence-based speed reading techniques for placement RC sections. Covers chunking, subvocalization reduction, and paragraph-first scan for TCS NQT and AMCAT.

Sum of Natural Numbers in Python: 3 Methods Explained

Three ways to calculate the sum of natural numbers in Python: the O(1) Gauss formula, sum() with range(), while loop, and recursion. Working code for each.

Reading Comprehension for Placements: Strategies and Patterns

Reading comprehension strategies for the verbal section of TCS NQT, Infosys, Wipro, and Capgemini placement tests, with passage types and timing tactics.

10 May 2026 · 9 min read

10 Technical Aptitude Questions: Set 3 (Solved)

Set 3 of solved technical aptitude questions covering data structures, DBMS, OS, networking, and OOP: the mix campus drives test most often.

Types of Linear Equations: Systems, Methods, and Solved Examples

Linear equations in one, two, and three variables. Consistent, inconsistent, and dependent systems explained with solved examples and placement-aptitude worked problems.

Blockchain Technology Explained: How It Works and Why It Matters

Blockchain is a distributed ledger that records transactions without a central authority. Here's how it works, where it's used in India, and what freshers need to know.

Coordinate Geometry Formulas and Solved Examples

Distance formula, slope, section formula, line equations, and area of triangle from coordinates with worked examples for placement aptitude tests.

Solving Inequalities: Linear, Quadratic, and Modulus

Master linear, quadratic, and modulus inequalities for campus placement tests. Includes the sign-chart method, worked examples, and the AM-GM inequality.