Programming Tutorials, Exercises & Guides

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Git Cheat Sheet (PDF) – Commands, Examples & Quick Reference

Cheat Sheets | Oct. 2, 2025, 10:24 a.m.

Overview of This Git Cheat Sheet If you’re looking for the most practical and complete Git Cheat Sheet, you’ve come to the right place. Git is the most widely used version control system, trusted by developers, teams, and companies worldwide to manage source code and collaborate efficiently. This Git reference guide by Solviyo is your one-stop resource — whether you’re a beginner learning Git basics or an experienced developer working on complex projects. In this cheat sheet, you’ll find all the essential Git commands with examples, organized into clear sections such as repository setup, branching, merging, stashing, undoing mistakes, and

Hackerrank Sales By Mach Problem Solution in Python & Java

OJ Solutions | Sept. 30, 2025, 2:05 a.m.

Problem Overview The Sales By Mach problem on HackerRank is a classic counting problem. You are given a pile of socks, each with a color represented by an integer. The

Python Cheat Sheet PDF – Syntax, Commands, Data Structures for Beginners & Developers

Cheat Sheets | Sept. 27, 2025, 6:20 p.m.

Introduction to the Python Cheat Sheet If you’re looking for the most practical Python cheat sheet, you’ve come to the right place. Python is one of the world’s most popular programming languages — loved by beginners for its simplicity and trusted by professionals for its power in web development, data science, artificial intelligence, machine learning, and automation. This Python cheat sheet by Solviyo is your complete reference, covering everything from basic syntax and variables to advanced topics like object-oriented programming, decorators, generators, async, and modules. You can read it online or download the PDF for offline use. Whether you are

LeetCode Add Two Numbers Problem Solution in C++, Python & Java

OJ Solutions | Sept. 25, 2025, 12:57 a.m.

Problem Overview The Add Two Numbers problem on LeetCode involves working with linked lists. You are given two non-empty linked lists representing two non-negative integers. The digits are stored in

LeetCode Two Sum Problem Solution in C++ and Go

OJ Solutions | Sept. 25, 2025, 12:40 a.m.

Problem Overview The Two Sum problem on LeetCode is one of the most popular beginner-friendly problems. It asks us to find two distinct indices in an array such that the

Counting Valleys HackerRank Solution in Python & Java | Step-by-Step Guide

OJ Solutions | Sept. 22, 2025, 12:41 a.m.

Problem Overview The Counting Valleys problem on HackerRank asks you to determine how many valleys a hiker walks through during a hike. The hiker's path is represented as a string

HackerRank Repeated String Problem Solution in C++ | Count 'a' Efficiently

OJ Solutions | Sept. 21, 2025, 8:58 a.m.

Problem Overview The Repeated String problem on HackerRank asks you to determine how many times the letter 'a' appears in the first n characters of an infinitely repeated string. You

HackerRank Jumping on the Clouds Problem Solution in Python & Java | Minimum Jumps Algorithm

OJ Solutions | Sept. 11, 2025, 4:18 p.m.

Problem Overview The HackerRank Jumping on the Clouds problem is a classic algorithmic challenge that tests your ability to make optimal decisions while traversing an array. You are given a

HackerRank Alternating Characters Problem Solution in C++ | Count Consecutive Duplicates

OJ Solutions | Sept. 11, 2025, 3:50 p.m.

Problem Overview The HackerRank Alternating Characters problem requires you to remove the minimum number of characters from a string so that no two identical characters are adjacent. The goal is

HackerRank Roads and Libraries Problem Solution in C++ | DFS Approach Explained

OJ Solutions | Aug. 19, 2025, 5:38 p.m.

Problem Overview The HackerRank Roads and Libraries problem is a classic graph problem where we need to build libraries and/or repair roads in a city to ensure that every citizen

Even Tree HackerRank Problem Solution in C++ with Step-by-Step Explanation

OJ Solutions | Aug. 19, 2025, 4:33 p.m.

Problem Overview The HackerRank Even Tree problem is a classic graph and tree problem that asks us to maximize the number of edges we can remove from a tree while

LeetCode 172 Factorial Trailing Zeroes Solution – C++ Implementation and Explanation

OJ Solutions | Aug. 16, 2025, 5:23 p.m.

Problem Overview In LeetCode 172: Factorial Trailing Zeroes, we are asked to find the number of trailing zeros in a factorial of a given number n. This problem is a

LeetCode 3163 String Compression III Solution – C++ Implementation and Explanation

OJ Solutions | Aug. 14, 2025, 6:15 p.m.

Problem Overview In LeetCode 3163: String Compression III, we are asked to compress a string by replacing consecutive repeated characters with a count followed by the character. One important detail

LeetCode 185 Department Top Three Salaries Solution Explained

OJ Solutions | Aug. 14, 2025, 5:46 p.m.

Why Solving Department Top Three Salaries SQL Problem is Important SQL problems like LeetCode 185: Department Top Three Salaries are not just exercises—they are essential for mastering SQL query writing

Why Learning Go (Golang) in 2025 Is a Smart Move: A Beginner’s Guide to the Future of Programming

Tech Trends | April 12, 2025, 7:19 p.m.

Introduction As someone who’s been exploring modern development trends, I’ve realized that picking the right programming language can make a big difference—not just in how fast you build, but how

Python vs Java in 2025: Which Language Should Beginners Learn First and Why?

Tech Trends | April 12, 2025, 7:15 p.m.

Introduction In today’s fast-changing tech world, coding has gone from a niche skill to something almost everyone needs. Whether you’re starting your tech career, planning to launch a startup, or