Placement prep + AI for engineers

Count Occurrences of Digit 3 from 0 to N: Formula and Code

Given N, count how many times digit 3 appears in all integers from 0 to N. Covers the O(log N) positional formula and C, Java, Python code.

8 May 2026 · 8 min read

Noddy's Largest Plot: Histogram Rectangle in Python

Solve the Noddy Toyland land puzzle with a monotonic stack in O(n). Step-by-step trace for [2, 1, 5, 6, 2, 3], Python code, and complexity analysis.

Integers with Exactly 9 Divisors in a Range

A positive integer has exactly 9 divisors only in two forms: p^8 or p^2 × q^2. This guide proves why, then shows a sieve-based Python solution with verified examples.

GCD of Two Numbers in Python: 4 Methods Explained

Four methods to find GCD in Python: while loop, recursion, Euclidean algorithm, and math.gcd. Includes code, dry runs, and placement round tips.

HCF and LCM: Methods, Tricks, and Verified Placement Examples

Prime factorization, Euclidean division, and the product rule for HCF and LCM: six verified examples, including one corrected from a widely circulated wrong answer.

HCL Interview Questions: Technical and HR Rounds

What HCLTech's technical and HR rounds test, with real question examples, the 2026 salary gap between standard and AI-skilled tracks, and a stage-by-stage prep guide.

HCL TechBee Program: Eligibility, Selection, and Salary 2026

HCL TechBee is HCLTech's early career program for Class XII students. Covers eligibility, HCL CAT, training structure, and starting salary for 2026.

HCL Recruitment Process 2026: Online Test, Technical, and HR Round

HCLTech's three-round fresher selection process: online written test format, technical interview topics, HR round questions, and 2026 salary bands.

Why Should We Hire You? Sample Answers for Freshers

Four sample answers to 'Why should we hire you?' for TCS Ninja, fintech, mech-to-IT, and AI-track freshers: each with the reasoning behind it.

Check Odd or Even Without Modulus: 3 Python Methods

Three Python approaches to check odd or even without the modulus operator: bitwise AND, integer division, and flag toggling, with runnable code.

Career Roadmap

How to Prepare for a Job Interview: 2026 Campus Placement Guide

Step-by-step interview preparation for engineering freshers in India: researching the company, technical round tactics, HR answers, and day-of logistics.

How to Prepare for Campus Placement Aptitude Tests (8-Week Plan)

Master campus placement aptitude tests with an 8-week study timeline, topic-priority matrix by company tier, and proven retention strategies for Quant, LR, and Verbal.

How to Solve Blood Relation Questions: 7 Worked Examples

Step-by-step family-tree method, 7 re-verified examples covering coded notation, generation gaps, and the cousin-not-brother trap for placement aptitude tests.

IBM Interview Rounds: Technical and HR Preparation Guide (2026)

IBM's campus interview runs technical and HR rounds after the aptitude test. Full preparation guide: branch-wise topics, common HR questions, and two prep timelines.

Infosys Recruitment Pattern: 2026 Guide to All Five Hiring Tracks

Updated 2026 guide to Infosys recruitment: five hiring tracks from Systems Engineer to Power Programmer, online test format, InfyTQ certification, and 60% eligibility.

Intel Interview Process: Step-by-Step Guide for Freshers

Intel's fresher interviews run through resume screening, a 90-to-110-minute technical round, a behavioural interview, and an HR round. Here's what each stage tests.

Introduction to C Programming: Basics and Fundamentals

C programming fundamentals for engineering students: Hello World breakdown, variables, data types, the compilation pipeline, and two worked programs.

KPMG Interview Questions and Process: 2026 Fresher Guide

KPMG India's campus recruitment runs two interview rounds: technical (Java, DBMS, data structures) and HR. Here's what gets asked and how to prepare.

Leap Year Program in C, C++ and Java

Leap year logic in C, C++, and Java with three implementation styles: basic conditional, function-based, and stdlib. Code, edge cases, and placement context.

Python Tutorial for Beginners: Hello World to Functions

Start Python in 2026: write Hello World, learn variables, types, control flow, and functions, then build FizzBuzz. Covers placement DSA and AI prep.

MAQ Software Interview Questions: Complete 2026 Guide

Three-round MAQ Software interview: written test, technical round covering OOP and data structures, and HR. Preparation checklist for CSE and IT freshers.

Clock Problems for Aptitude Tests: Formula and Worked Examples

Derive the clock angle formula from first principles, learn why hands coincide exactly 11 times in 12 hours, and work through six placement-test problems.

Mastering Simple and Compound Interest: Formulas and Examples

Solve SI and CI questions for placement aptitude tests using the right formula for each type. Covers compounding variants, five question patterns, and verified examples.

Syllogisms: Step-by-Step Rules and 8 Worked Examples

Master the three syllogism types, five deduction rules, and Venn diagram method with eight worked examples from campus placement aptitude tests.

Remainder Concept: Methods and Examples for Aptitude Tests

Solve remainder problems in aptitude rounds: product rule, negative remainders, Euler's theorem, and fully verified worked examples for TCS NQT and AMCAT.

Microsoft Interview Questions for Freshers: 6 Worked Examples

Six worked Microsoft fresher interview questions: graphs, DP, tries, system design, behavioral STAR, and project deep-dive, each with solutions and complexity analysis.

LTIMindtree Interview Questions for Freshers: 2026 Guide

LTIMindtree's technical and HR interview questions for freshers, with topic-by-topic prep for the 2026 hiring cycle.

LTIMindtree Logical Reasoning: 2026 Guide with Solutions

8 worked LTIMindtree logical reasoning questions with solutions: coding-decoding, number series, blood relations, direction sense, syllogisms, and seating arrangements.

LTIMindtree Logical Reasoning: Practice Questions with Solutions

Practice LTIMindtree logical reasoning questions with step-by-step solutions. Covers seating arrangements, number series, coding-decoding, and direction sense.

Pattern Printing in C: 9 Interview Programs Explained

Nine pattern printing programs for C technical interviews: star, number, and letter types with verified code, output traces, and complexity notes.

8 May 2026 · 8 min read

Most Commonly Asked Java Interview Questions, Set 2

ArrayList vs Vector, runtime polymorphism, multiple inheritance via interfaces, servlet lifecycle, and finalize(). Core Java interview Set 2 topics for freshers.

Mphasis Logical Reasoning: Syllabus, Pattern and Worked Examples

Mphasis logical reasoning: 14 AMCAT questions in 14 minutes. Verified worked examples and topic breakdown for series, blood relations, and syllogisms.

Mphasis Verbal Ability 2026: Syllabus and Preparation Strategy

Mphasis uses the AMCAT verbal section: 18 questions in 16 minutes. Full syllabus, worked sample questions, and preparation strategy by topic type.

Mu Sigma Psychometric Test: OCEAN Model and Preparation Guide

Mu Sigma's personality section uses the OCEAN model across ~45 questions. Learn what each trait signals to recruiters and how to answer consistently.

Mu Sigma MuApt Test Pattern and Syllabus: 2026 Guide

The Mu Sigma MuApt test covers six domains on the CoCubes platform. Full pattern breakdown, domain-by-domain syllabus, and prep priorities for the 2026 placement season.

Mu Sigma Verbal Ability Questions: MuApt Language Section Guide

Mu Sigma's MuApt Language section has 15 questions on reading comprehension, sentence correction, and vocabulary. Pattern, worked examples, and prep plan.

Mu Sigma Video Synthesis Round: Format, Skills, and Prep Guide

Mu Sigma's Video Synthesis Round tests analytical thinking and concise written communication. Full format, evaluated skills, and preparation strategy.

Skills Required to Get Placed in a Core Company

Branch-wise breakdown of technical, aptitude, and communication skills engineering students need for core company placements: Mechanical, ECE, Civil, and CS/IT.

Capgemini Recruitment Process 2026: Rounds, Eligibility, CTC

Capgemini's 2026 fresher hiring runs two offer tracks and four selection stages. Covers eligibility, Analyst vs Senior Analyst CTC, essay round, and registration.

DXC Technology Off-Campus Drive: Eligibility, Test Pattern and Prep

DXC Technology hires freshers via off-campus drives on the AMCAT platform. Eligibility, six-section test pattern, and a section-by-section prep roadmap for 2026.

PayPal Interview Questions and Interview Experience Guide

PayPal's campus interview covers an online coding test, two technical rounds, and HR. Here's what the process looks like and the questions that come up most.

Prime Number Program in Python: Primes in a Range

Three Python algorithms to check and find prime numbers in a range: trial division, 6k±1 optimisation, and Sieve of Eratosthenes, with manual traces.

Integers with Exactly 9 Divisors: C++, Java, Python

C++, Java, and Python programs to count integers from 1 to N with exactly 9 divisors. Two-case sieve algorithm, O(sqrt(N)) complexity, verified sample I/O.

Program to Print Pascal's Triangle in C, Python, and Java

Step-by-step guide to printing Pascal's triangle in C, Python, and Java, with row construction logic, O(n²) complexity, and placement interview context.

Reverse a String in C, C++, Java and Python

String reversal in C, C++, Java and Python: in-place two-pointer swap, std::reverse, StringBuilder.reverse, and Python slice notation, with complexity analysis.

Python 2 vs Python 3: Which Should You Learn in 2026?

Python 2 reached its end-of-life in January 2020. The five key differences, why every placement platform runs Python 3, and how to verify your setup.

Rearrange Positive and Negative Numbers in an Array

Three approaches to rearranging positive and negative numbers in an array: partition, order-preserving, and alternating, with C++ and Python code.

Samsung Recruitment Process 2026: Pattern, Syllabus, Interviews

Samsung's campus selection runs four rounds: GSAT, coding test, technical interview, and HR. Full 2026 test pattern, syllabus, and prep guide for freshers.