Placement preparation

Encrypt a Secret Code with Two Key Values: C++ and Python

Encrypt a secret code S using key values N and M via last-digit cycles and modular exponentiation. C++ and Python code, worked examples, and an edge-case fix.

Fibonacci Series up to N Value in C, C++, Java and Python

Print all Fibonacci numbers ≤ n using iterative, recursive, and memoization approaches. Full working code in C, C++, Java, and Python.

Noddy's Largest House: Solving the Max-Gap Problem

Solve the Noddy house-numbers problem: sort houses by position, scan for the largest gap, return the flanking pair. Worked example and Python code.

Find the Equilibrium Index of an Array

Step-by-step guide to finding the equilibrium index of an array using O(n²) and O(n) prefix-sum methods, with working code in C, C++, Python, and Java.

7 May 2026 · 8 min read

Finding Square Roots and Cube Roots: Quick Methods for Aptitude

Master the last-digit trick, Babylonian method, and prime factorisation for square and cube roots, with 10 worked placement examples.

Fresher IT Jobs in Bangalore: Clusters, Companies and CTC Bands (2026)

Bangalore holds India's largest IT workforce. This 2026 guide covers five hiring clusters, top recruiters, CTC bands, and application paths for freshers.

7 May 2026 · 5 min read

Fresher IT Jobs in Chennai: Roles, Companies, and Where to Apply

Chennai's OMR belt concentrates most South India IT fresher hiring. Here are the active 2026 roles, companies, and application routes for engineering graduates.

IT Jobs in Hyderabad for Freshers: 2026 Salary and Skills Guide

Hyderabad hosts 355+ GCCs and every major IT services firm. Here's what freshers earn, which roles are open, and what interviewers test in 2026.

Generate Binary Numbers from 1 to N: 3 Python and C++ Methods

Three methods to generate binary numbers from 1 to N: queue BFS, bit-shift loop, and Python built-ins. Code with trace examples and a complexity table.

Greatest of Three Numbers in Python: 3 Methods

Three Python methods to find the greatest of three numbers: if-else comparison, built-in max(), and a custom function. Sample runs and edge-case handling included.

7 May 2026 · 5 min read

Half Pyramid Pattern in Python: 5 Variants with Code

Learn five half pyramid patterns in Python with asterisks, same numbers, incrementing, decrementing, and alphabets. Each variant includes code and verified output.

5 Critical Reasoning Question Types: How to Approach Each

Assumption, inference, strengthen/weaken, paradox, and logical flaw questions explained with worked examples and a per-type approach for placement aptitude tests.

How to Find the Unit Digit of a Number: Step-by-Step

Solve unit digit problems in aptitude tests using cyclicity tables for digits 2–9. Covers products, powers, and the mod-4 method with worked examples.

Calendar Problems in Aptitude Tests: Derive, Don't Memorise

Learn the odd-days method for calendar aptitude questions, re-derive the century table from first principles, and work through 6 verified examples.

Verbal Ability for Placements: The Complete Prep Guide

Master reading comprehension, sentence correction, para-jumbles, and vocabulary for campus placement tests. Includes a 4-week study plan and test-specific topic maps.

How to Solve Percentage Problems in Aptitude Tests

Master the key percentage shortcuts for campus placement tests: the a%-of-b swap, successive-change formula, election problems, and fully worked examples.

Sentence Correction: 7 Common Error Types and Fix Rules

Seven error types cover most sentence correction questions in placement tests. Includes worked examples and a fix rule for each type.

Ratio and Proportion: Formulas, Tricks, and Worked Examples

Ratio and proportion for placement aptitude: formulas, componendo-dividendo, continued proportion, and 7 step-by-step worked examples across problem types.

LCM of Two Numbers in Python: 3 Methods Explained

Three Python methods to compute LCM: brute-force loop, GCD formula (Euclidean algorithm), and the math.lcm builtin (Python 3.9+). Worked examples and N-number extension.

Simple and Compound Interest: Formulas, Examples and Shortcuts

Worked examples for SI=PRT/100, CI=P(1+R/100)^T, half-yearly and quarterly compounding, and the CI-SI difference shortcut used in campus placement aptitude tests.

Matrix Addition in Python: Step-by-Step with Code Examples

Four approaches to matrix addition in Python: nested loops, list comprehension, zip, and NumPy. Includes dimension validation and traced outputs.

Arrangement Puzzles: Types, Strategy, and Worked Examples

Learn to solve linear, circular, and complex arrangement puzzles with a step-by-step strategy and verified examples for placement aptitude tests.

Percentage Formulas: 5 Core Concepts with Worked Examples

Master the 5 core percentage formulas for placement aptitude tests, with step-by-step worked examples on salary hikes, P&L, successive change, and exam scores.

Time, Speed and Distance: Formulas, Shortcuts and Worked Problems

Every TSD formula for placement aptitude tests: average speed, relative speed, trains, boats and streams, with step-by-step verified examples.

Misplaced Modifiers in Sentence Correction: A Deep Dive

Fix misplaced, dangling, squinting, and limiting modifiers in sentence correction. Placement-ready rules, worked examples, and practice questions.

Mixtures and Alligations: Complete Aptitude Guide

Master the alligation rule, simple replacement, and the repeated-replacement formula with 9 verified worked examples for placement aptitude tests.

7 May 2026 · 8 min read

Most Asked Java Interview Questions, Set 1

Core Java interview questions for freshers: JDK vs JRE, == vs .equals(), overloading vs overriding, abstract class vs interface, exception handling, and collections.

Most Commonly Asked Java Interview Questions

Java interview questions freshers face most: OOP, collections, exception handling, JVM memory, and threading, with verified code examples and concise answers.

Multiplying Any Number by 111: The Shift-and-Add Trick

Multiply any number by 111 using the shift-and-add method. Full derivation, carry examples including 786 × 111 = 87,246, and practice problems for placement aptitude.

Must-Know Technical Interview Questions for CSE/IT Freshers

The 18 most common technical interview questions across DSA, operating systems, databases, OOP, and networking, with concise answers for campus placement.

C Programming Questions: Must-Solve List for Beginners

Must-solve C programming questions for beginners, covering control flow, recursion, strings, arrays, and matrix operations with working code examples.

Must-Solve Conceptual C Questions for Placement Interviews

Eight conceptual C questions on pointers, undefined behavior, sizeof, and switch fall-through, with answers, C standard citations, and output traces.

Number Analogy Patterns: The 5-Category Method for Logical Reasoning

Master the five number-analogy pattern types, a 30-second elimination method, and nine solved examples from campus placement aptitude tests.

Number to Words: Python Program and Algorithm

Convert any integer to its English-word equivalent in Python. Step-by-step algorithm, verified worked examples, and complete code for number-to-words conversion.

Palindrome Pyramid Pattern Using Numbers: C, Python, Java

Step-by-step code and loop trace for the palindrome number pyramid in C, C++, Python, and Java, with centered and half-pyramid variants.

Paragraph Completion Questions: Strategy and Worked Examples

Master paragraph completion for TCS NQT, Cocubes, and Infosys verbal tests. Five worked examples with full discourse-level reasoning and answer derivation.

Pascal's Triangle in Python: Two Approaches With Sample Output

Print Pascal's triangle in Python using two approaches: row-based dynamic computation and math.comb. Both approaches verified for n=5 rows with sample output.

Permutations and Combinations: Formulas, Shortcuts, Worked Examples

Master nPr and nCr with the factorial formulas, shortcut tricks, and six verified worked examples used in campus placement aptitude tests.

Pipes and Cisterns Problems: Concepts and Worked Examples

Pipes and cisterns from first principles: fill rates, empty rates, LCM shortcut, and 8 worked examples covering every question type in campus placement aptitude tests.

Prepositions of Place: In, On, At and Beyond

Master every preposition of place: in, on, at, above, below, beside and more, with memory tricks and placement-test practice questions.

Probability Formulas with Examples for Aptitude Problems

Probability formulas for placement aptitude tests, with worked examples on addition rule, multiplication rule, conditional probability, and replacement draws.

Profit and Loss: Key Concepts, Formulas, and Solved Examples

Master profit and loss for campus placement aptitude: CP, SP, marked price, discount chains, and 9 worked examples verified step by step.

Profit and Loss: Concepts and Problems Solved Under 1 Min

Master profit and loss for campus placement aptitude tests. Core formulas, speed tricks, marked price, successive discounts, and 10 solved examples.

Find All Symmetric Pairs in an Array

Two approaches to find all symmetric pairs in an array: O(n^2) brute force and O(n) HashMap, with working C++, Python, and Java code.

Amicable Numbers (Friendly Pair): C, C++, Java, Python

Check amicable (friendly pair) numbers in C, C++, Java, and Python. Verified examples with (220,284), O(√n) algorithm, test cases, and placement context.

Find Sum of Digits of a Number: C, C++, Java, Python

Programs to find the sum of digits of a number in C, C++, Java, and Python. Iterative and recursive approaches with step-by-step traced outputs.

Program to Generate Tsunami Report in C, Java and Python

Step-by-step solutions in C, Java and Python for the Tsunami report problem: read three integers, print a numbered report in exact format.

Replace All 0 Digits with 1 in an Integer: Python, C and Java

Three approaches to replace every 0 digit with 1 in an integer: string conversion, digit extraction loop, and edge cases. Code in Python, C, and Java.