Placement preparation

Binary to Decimal Conversion: Algorithm, Code, and Edge Cases

Positional weighting, three verified worked examples, and C, Python, Java implementations, including built-in functions and signed-number edge cases.

Count Number of Digits in an Integer: 3 Methods

Three approaches to count digits in an integer: loop, recursion, and O(1) logarithm. Compare time complexity, edge cases, and what placement tests expect.

N-Digit Numbers with Non-Decreasing Digits: Two Approaches

Count n-digit sequences with non-decreasing digits using C(n+9,9). Stars-and-bars proof, DP solution, Python code, and worked examples for n=1 through n=5.

Crack CAT in 54 Hours: Section-by-Section Prep Plan

A 54-hour CAT prep plan across three sections: Quantitative Ability, DILR, and VARC. Covers realistic percentile targets, topic priorities, and mock test strategy.

Conceptual C MCQs for Placement Interviews

Five essential C programming MCQs on pointers, static variables, struct sizing, and token counting, with step-by-step traces for placement tests.

Diamond Pattern in Python: Two Programs Explained

Two Python programs to print full diamond and half-diamond star patterns, with the loop logic and space-count formula explained for placement prep.

9 May 2026 · 4 min read

Determiners in Sentence Correction: Complete Grammar Guide

Articles, demonstratives, quantifiers, and possessives tested in every placement verbal section. Rules, 10 worked examples, and error patterns.

Python Dictionaries: Operations, Methods, and Examples

Learn how Python dictionaries store key-value pairs: how to create, access, modify, delete, and iterate over them. Includes dict comprehensions and placement examples.

range vs xrange in Python: What Changed in Python 3

Python 2 had both range() and xrange(). Python 3 removed xrange() and made range() lazy. This guide covers memory behaviour, indexing gotchas, and when to use list().

Count Vowels in a Character Array Using Pointers in C

Step-by-step C program to count vowels in a character array using pointer arithmetic. Algorithm, traced output, case-insensitive variant, and complexity analysis.

Find All Missing Elements of a Range: 3 Approaches Ranked

Three approaches to find all missing elements of a range: from O(n) hashing to in-place marking, with complexity tables and placement interview context.

Find All Nodes at K Distance from Root in a Binary Tree

Two methods to print every node exactly k edges from the root: recursive reduction and BFS level-tracking, with complexity analysis and placement context.

Quadratic Equation Roots in C, C++, Java, and Python

Algorithm, discriminant logic, and working code to find all roots of a quadratic equation in C, C++, Java, and Python, covering real, equal, and complex root cases.

Area of a Circle in C, C++, Java and Python

Step-by-step programs to find the area of a circle in C, C++, Java and Python, with sample output and common coding-round pitfalls.

Array Subset Check: 4 Methods in C++, Java, Python

Check if an array is a subset of another using four methods: two loops, binary search, sort-merge, and hashing. C++, Java, and Python code with time complexity.

Find Prime Numbers in a Given Range: C, C++, Java, and Python

Complete programs to find prime numbers in a given range in C, C++, Java, and Python. Covers trial division, sieve approach, and edge case analysis.

Find Repeating Elements in an Array: Three C++ Approaches

Three C++ methods to find duplicate elements in an array: brute-force O(n²), sorting O(n log n), and hashing O(n). Code, complexity table, and placement interview tips.

Find the First Non-Repeating Character in a String

Solve the first non-repeating character problem: O(n²) brute force and O(n) hash map with worked examples in Python, C, and Java.

Find the Largest Element in an Array Using Python

Four Python methods to find the largest element in an array: loop, max(), sorted(), and NumPy. Includes time complexity notes for campus placement coding rounds.

Count Ways to Reach a Score in a Game: DP Approach

Count unordered ways to reach a target score with DP. Verified recurrence, step-by-step trace, Python and C code, time and space complexity for placement rounds.

Decode Ways: Count All Decodings of a Digit Sequence

Count all valid letter strings a digit sequence can represent, using recursion, memoization, and dynamic programming, with worked examples and edge-case handling.

Find the Product of All Leaf Nodes in a Binary Tree

Step-by-step guide to finding the product of all leaf nodes in a binary tree using recursive DFS. Python, Java, and C++ code with O(n) complexity analysis.

Find the Smallest Element in a Python List

Find the smallest element in a Python list using a for loop or the built-in min(). Covers linear search algorithm, edge cases, and O(n) complexity.

Sum of All Odd Frequency Elements in an Array

Find the sum of elements with odd frequency in an array using hash maps. C++, Java, and Python code with worked example, trace, and O(n) complexity analysis.

Find the Sum of Natural Numbers With and Without Recursion

Formula, iterative, and recursive programs to find the sum of N natural numbers, with C and Python code, time-space trade-offs, and placement-test context.

Squaring Numbers Fast: Three Techniques for Aptitude Tests

Three techniques to square numbers mentally: the base method, ends-in-5 shortcut, and binomial expansion. Worked examples for TCS NQT and AMCAT.

Find the Second Smallest Element in an Array: 3 C++ Approaches

Three C++ methods to find the second smallest array element: sort, two-pass, and single-pass. Complexity table, edge cases, and placement interview tips.

For Loop in Python: Syntax, range(), and Worked Examples

Learn how Python's for loop iterates over lists, strings, and ranges. Covers range(), break, continue, nested loops, and placement coding patterns.

Fresher IT Jobs in Pune: Companies, Packages, and How to Apply (2026)

Pune has 500+ IT companies across Hinjewadi, Kharadi, and three other tech parks. Which ones hire freshers, what they pay, and how to clear the selection process.

Function Arguments in Python: 5 Types Explained

Learn all five Python argument types: positional, keyword, default, *args, and **kwargs, with code examples and the ordering rules that placement tests check.

Function Overloading in C: Why It Fails and What Works

C does not support function overloading natively. Learn why, and explore C11 _Generic, stdarg.h, and function pointers as the standard workarounds.

Function Prototype in C: K&R Style, ANSI Syntax, Header Files

Learn C prototype syntax: the ANSI form, the K&R legacy style, the void vs empty-parentheses trap, and how to structure header files correctly.

Functions in Python with Examples: Complete Guide

Learn to define, call, and use Python functions with examples covering parameters, return values, lambda, and recursion for placement interview prep.

GCD of Two Numbers: Iterative, Recursive, and Python

Learn three methods to find the GCD of two numbers: iterative loop, Euclidean algorithm, and Python's math.gcd, with code examples and complexity.

Word Usage Questions: 4 Strategies for Placement Tests

Identify incorrect word usage in placement tests with a four-step approach. Covers parts of speech shifts, idiomatic traps, and phrasal verb errors with worked examples.

Heap Sort in C, C++, and Java: Step-by-Step Guide

Heap sort runs O(n log n) in every case. Guide covers max-heap construction, heapify traced on a 6-element array, working C/C++/Java code, and complexity comparison.

How an MBA Helps Engineers Get Leadership Roles in India

An IIM or ISB MBA moves engineers from individual contributor to general manager. Here's the CAT/GMAT pathway, salary data, and what top programmes deliver.

How to Approach a Competitive Programming Question

A structured five-step approach to competitive programming questions: from reading constraints to testing edge cases, built for placement coding rounds.

How to Crack Verbal Ability in Placements: Part 2 Guide

Technique-level guide to reading comprehension, cloze passages, sentence correction patterns, and synonym strategy for TCS NQT, AMCAT, and Capgemini.

Height of a Binary Tree: Recursive and Iterative Methods

Calculate binary tree height using recursive (O(h) stack) and iterative BFS (O(w) queue) methods in C++, with trace-through examples and complexity trade-offs.

String Length Without strlen() in C: 3 Placement-Ready Methods

Three C programs that find string length without strlen(): loop scan, pointer arithmetic, and recursion, with traced outputs for TCS NQT and AMCAT rounds.

Generate Binary Numbers 1 to N: Queue and Arithmetic Methods in Java

Two Java methods to generate binary numbers from 1 to N: arithmetic division and queue-BFS. Includes Java code, complexity analysis, and placement interview context.

Fast Multiplication Trick for Numbers 90 to 100

The base-100 subtraction trick multiplies two numbers between 90 and 100 in four steps. Includes algebraic proof, eight worked examples, and the carry case.

How to Prepare for AMCAT in 2 Days: Study Plan

A module-by-module AMCAT preparation plan for engineering students covering English, Quantitative Ability, and the optional CS section in a 48-hour schedule.

How to Reverse a String in Python: 5 Methods Explained

Five ways to reverse a string in Python: slicing, reversed(), loop, recursion, and word-by-word, with code, complexity, and placement-round tips.

Natural Numbers, AP, GP and Means: Placement Aptitude Guide

Master the six core formulas for natural-number sums, arithmetic progressions, geometric progressions, and the AM-GM-HM inequality for placement aptitude.

iNautix Recruitment Process 2026: Test Pattern & Overview

iNautix Technologies (BNY Mellon) campus hiring: 4-round process, online test sections, technical interview topics, and preparation strategy for freshers.

Global and Static Variables in C: Initialization Rules

Global and static variables in C are zero-initialized by default. Learn storage-class rules, BSS vs. data segment, and placement MCQ patterns for TCS NQT and AMCAT.