Coding rounds, worked example by worked example.
Python, Java, C, C++. And the data structures and algorithms that actually show up in placement coding rounds.
Pattern problems, arrays, strings, trees, graphs, dynamic programming. Every solution is runnable; every complexity claim is justified.
Solve in the language your placement test wants.
The 6-Month AI Roadmap for CSE Students: 2026 Plan
A month-by-month AI learning plan built on your CSE foundations: ML theory, deployment skills, and portfolio projects calibrated for placement season.
2026 AI Roadmap for ECE Students: From Electronics to ML
ECE coursework in signal processing and linear algebra gives you a head-start on the ML math layer. Here is the 6-month plan to build on it.
8 Python Coding Patterns in AI/ML Fresher Interviews 2026
Eight Python coding patterns that repeat in AI/ML fresher interviews, from pandas groupby and numpy broadcasting to implementing logistic regression in 20 lines.
Top 5 AI Projects for Fresher Resumes in 2026
Five AI project types that generate interview callbacks at Indian fresher drives in 2026, ranked by recruiter-side hireability impact, not technical complexity.
C Programs Set 2: Six Placement-Round Problems Solved
Reverse a number, sum of digits, Armstrong check, GCD, Fibonacci, and prime with sqrt optimisation. Code, step traces, and time complexity for each.
Pandas and NumPy Interview Questions for AI/ML Freshers: 2026 Guide
The 15 Pandas and 8 NumPy operations that recur in AI/ML fresher screening rounds in 2026, with answer patterns and key gotchas.
Transpose of a Matrix: C, C++, Java and Python Code
Full code to find the transpose of a matrix in C, C++, Java and Python. Covers square and rectangular inputs, in-place swap, and O(rows*cols) complexity.
Introduction to Arrays in C Programming
Learn how arrays work in C, from declaration and initialisation to 1D and 2D types, core operations, and the patterns that appear in placement interviews.
Balanced Parenthesis Checker: Stack-Based Solution With Code
Step-by-step guide to checking balanced parentheses using a stack in Python and Java, with time and space complexity analysis for placement rounds.
Constants in C and C++: const, define, constexpr Explained
Learn to declare constants in C and C++ using const, #define, enum, and constexpr. Includes examples, comparison table, and placement MCQ patterns.
Escape Sequences in C: Complete Guide with Examples
A complete reference for C escape sequences with code examples and traced output. Covers newline, tab, null, and placement-round output questions.
Factorial Program in C, C++ and Java: 4 Methods
Find the factorial of a number in C, C++ and Java using iterative, recursive, tgamma, and BigInteger methods, with working code and a side-by-side comparison.
File Handling in Python: Open, Read, Write, Delete
Master Python file handling for placement exams. Covers open modes, the with statement, read/write methods, and the os module with runnable examples.
Functions in C and C++: What Placement Tests Actually Test
Declarations, definitions, pass by value, pass by reference: the function concepts that C and C++ placement OA rounds check repeatedly.
How to Concatenate Strings in Python: 5 Methods with Examples
Five methods to concatenate strings in Python: +, join(), f-strings, format(), and %, with code examples, performance trade-offs, and placement round tips.
Core Java Interview Questions for Freshers (With Answers)
Thirty core Java interview questions with answers covering OOP, Collections, Exception Handling, and Multithreading. Built for service-tier technical interviews.
Infosys Certification Exams 2026: Springboard, Pattern, and Prep
What Infosys certifications exist in 2026, how Springboard registration works, exam pattern, syllabus areas, and prep methods for engineering students.
Python Iterators Explained: How the Protocol Works
Python iterators power every for loop in the language. Learn how __iter__ and __next__ work, build a custom iterator class, and avoid the interview mistakes.
int main() vs int main(void) in C and C++: The Difference Explained
In C++, int main() and int main(void) are identical. In C, empty parentheses mean unspecified arguments, void means none. The full breakdown with code examples.
Programming Skills That Pay for Freshers in 2026
Six skills separate freshers who clear product-company technical screens from those who don't. Here is what they are and how to build them.
Palindrome Program in Python: Check Numbers and Strings
Five methods to check palindromes in Python: integer reversal, slicing, two-pointer, and recursion. Step-traces, complexity table, and placement context included.
Multiplication Table Program in C, C++, Java, and Python
Write a multiplication table program in C, C++, Java, and Python using for and while loops. Includes algorithm, sample I/O, output formatting, and placement context.
Program to Find the Largest Palindrome in an Array
Step-by-step walkthrough to find the largest palindrome in an array of integers, with Python code, two worked examples, and complexity analysis.
Positive, Negative, or Zero: Number Sign Program in 4 Languages
Check if a number is positive, negative, or zero in C, C++, Java, and Python. Covers the three-branch algorithm, ternary operators, and integer overflow edge cases.
Solid and Hollow Rectangle Star Pattern Programs
Learn to print solid and hollow rectangle star patterns with programs in C, Python, and Java. Covers loop logic, worked output, and common coding mistakes.
Python Variable Scope: Local and Global Variables Explained
Learn how local and global variables work in Python, when to use the global keyword, and how scope errors appear in placement coding tests.
Sort Elements by Frequency: 3 Approaches for Wipro Interviews
Sort elements of an array by frequency using HashMap sort, bucket sort, and TreeMap. Python and Java code examples, complexity table, and Wipro NTH context.
String Operations in Python: 10 Programs Every Fresher Should Know
Master Python string operations with 10 working code examples: reverse, concatenate, check palindromes, count vowels, and format strings. Built for placement prep.
TCS CodeVita Questions from Previous Editions (With Solutions)
TCS CodeVita is a global coding contest separate from TCS NQT. Covers problem categories, verified sample problems, and a prep roadmap across recent CodeVita editions.
TCS NQT Coding Questions and Answers: 2026 Format and Strategy
The TCS NQT coding section gives you 30 minutes and 2 questions. Understand the 2026 format, cutoffs, sample questions with solutions, and prep strategy.
Tokens in C: Keywords, Identifiers, Constants, and Operators Explained
Every C program breaks down into six token types. Here is what each one does, the rules that govern each, and the mistakes that trip up students in placement tests.
Variables and Keywords in C: A Complete Reference
Learn the rules for naming variables in C, all 32 reserved keywords by category, storage classes, scope, and the interview traps that trip up placement candidates.
Area of Circle in Python: Program Guide with math.pi
Three Python programs to calculate circle area: hardcoded π, math.pi, and numpy.pi. Covers input handling, edge cases, and verified outputs for r=5.
Armstrong Number in Python: 3 Easy Programs
Python programs to check Armstrong numbers: while loop, list comprehension, and a range finder. Verified digit-power derivations for 153, 370, 371, 407, and 9474.
Assignment Operators in Python: Complete Guide with Examples
All 8 Python assignment operators with code examples: = and the 7 augmented forms (+=, -=, *=, /=, %=, **=, //=), walrus :=, and placement test traps.
Python Logical Operators: and, or, not With Examples
Python's and, or, not keywords evaluate conditions, short-circuit expressions, and power the default-value idiom. Truthy/falsy, bitwise differences, and common bugs.
Check if Two Arrays Are Disjoint: C, C++, Java and Python
Four approaches to check if two arrays share no common elements: nested loops O(m×n), sort plus two-pointer, and hash set O(m+n), with C, C++, Java, and Python code.
Commonly Asked C Technical Interview Questions (with Answers)
The seven concept areas C interviewers test most: pointers, memory, strings, storage classes, preprocessor, structs, and undefined behavior, with worked examples.
Count the Number of Ways to Reach the Nth Stair
Staircase problem solved four ways: naive recursion, memoized DP, tabulation, and O(1) space. Python code, verified Fibonacci values, and k-step variation.
Python Decorators: @syntax, functools.wraps, and Practical Examples
Learn Python decorators step by step: @decorator syntax, functools.wraps, parametrized decorators, class-based decorators, and placement interview examples.
Modular Exponentiation in Python: pow(b, e, n) Explained
Compute b^e mod n without overflow using Python's three-argument pow(b, e, n) or the square-and-multiply algorithm. Worked example included.
Find All Ancestors of a Node in a Binary Tree
Find all ancestors of a node in a binary tree with recursive and iterative Python solutions. Includes complexity analysis and placement interview patterns.
Min and Max of Arithmetic Expression with + and * (Interval DP)
Find the minimum and maximum of a + and * expression by placing parentheses, using interval DP with a step-by-step worked example.
Shortest Path Between Two Vertices in an Undirected Graph
BFS-based shortest path in undirected graphs: adjacency-list representation, parent-tracking, path reconstruction, and Python + C++ code.
Check if a Character is a Vowel or Consonant in C
Three C programs classify any character as a vowel, consonant, or non-alphabet input using if-else with tolower(), switch-case, and a strchr() lookup table.
Print All Distinct Elements in an Array in C
Three C programs to print all distinct elements in an array: nested-loop O(N²), sorting, and count-array, with complexity trade-offs and placement interview tips.
Technical Round Self-Study System: 2026 Engineer's Guide
A practical guide for building a self-study technical-round prep system covering DSA, OS, CN, DBMS, and programming: free and low-cost resources included.
Python Conditionals: if, if-else, elif, and Nested if Explained
Python's if, if-else, elif, and nested if statements control program flow. Syntax, worked examples, and truthiness edge cases for 0, '', [], and None.
The AI Career Roadmap 2026
Once your DSA is solid, the next layer is AI. Get the free PDF for the projects that recruiters actually credit on a resume.
Download the free PDF