🧩 Algorithms & Problem Solving — Level 1

A structured C++ problem-solving journey focused on programming fundamentals, logic building, functions, conditions, loops, arrays, validation, and practical algorithms.

Overview • Roadmap • All Problems • Skills

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🎯 Overview

This repository contains 50 C++ problem-solving exercises arranged as a progressive learning path. Each problem has its own folder and a dedicated source file so it is easy to study, run, compare, and revisit.

Learn → Solve → Compare → Practice → Improve

📊 Repository	Details
🧩 Problems	50
💻 Language	C++
📁 Organization	One folder per problem
🔁 Alternative approaches	Kept separately when available
🧹 File naming	Clean - separators

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🧭 Quick Navigation

Range	Focus	Link
01–10	Functions, input/output, structs, enums, arithmetic	Explore
11–20	Averages, comparisons, swapping, geometry	Explore
21–30	Validation, loops, odd/even, factorial, prime logic	Explore
31–40	Powers, grades, commission, currency, calculator, billing	Explore
41–50	Time, menus, letters, loans, ATM logic	Explore

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📚 Roadmap

🧠 Problems 01–10

#	Problem	Main concept	🔗
01	Print Name	Functions and parameters	▶ View Code
02	Read And Print Name	Input, strings, functions	▶ View Code
03	Check Number Type	Enums, modulo, functions	▶ View Code
04	Employee Hiring Decision	Structs and conditions	▶ View Code
05	Employee Hiring With Recommendation	Structs and combined conditions	▶ View Code
06	Full Name With Reverse Option	Strings and conditional logic	▶ View Code
07	Half Number	Arithmetic and functions	▶ View Code
08	Pass Or Fail	Conditions and validation	▶ View Code
09	Sum Of Three Numbers	Parameters and arithmetic	▶ View Code
10	Average Of Three Numbers	Arithmetic and floating point	▶ View Code

🔢 Problems 11–20

#	Problem	Main concept	🔗
11	Average And Pass Or Fail	Functions and conditions	▶ View Code
12	Maximum Of Two Numbers	Comparison and functions	▶ View Code
13	Maximum Of Three Numbers	Multi-value comparison	▶ View Code
14	Swap Two Numbers	Variables and swapping	▶ View Code
15	Rectangle Area	Geometry and arithmetic	▶ View Code
16	Rectangle Area By Side And Diagonal	Geometry and formulas	▶ View Code
17	Triangle Area	Geometry and formulas	▶ View Code
18	Circle Area By Radius	Geometry and pi	▶ View Code
19	Circle Area By Diameter	Geometry and diameter/radius	▶ View Code
20	Circle Area Inscribed In A Square	Geometry and formulas	▶ View Code

🧮 Problems 21–30

#	Problem	Main concept	🔗
21	Circle Area By Circumference	Geometry and formulas	▶ View Code
22	Circle Area Inscribed In An Isosceles Triangle	Geometry and formulas	▶ View Code
23	Circle Area Described Around A Triangle	Geometry and formulas	▶ View Code
24	Validate Age Once	Input validation	▶ View Code
25	Validate Age Until Valid	Loops and validation	▶ View Code
26	Print Numbers From 1 To N	for loops	▶ View Code
27	Print Numbers From N To 1	Reverse iteration	▶ View Code
28	Sum Odd Numbers From 1 To N	Conditions and accumulation	▶ View Code
29	Sum Even Numbers From 1 To N	Conditions and accumulation	▶ View Code
30	Factorial	Loops and multiplication	▶ View Code

🧠 Problems 31–40

#	Problem	Main concept	🔗
31	Number Powers 2, 3 And 4	Loops and powers	▶ View Code
32	Number Power M	General power calculation	▶ View Code
33	Grade Classification	Conditions and ranges	▶ View Code
34	Sales Commission	Business logic and conditions	▶ View Code
35	Currency Conversion	Arithmetic and input	▶ View Code
36	Simple Calculator	switch and operators	▶ View Code
37	Sum Positive Numbers	Validation and accumulation	▶ View Code
38	Prime Number Check	Divisibility and loops	▶ View Code
39	Cash Remainder	Integer arithmetic	▶ View Code
40	Bill With Service Fee And Tax	Multi-step calculations	▶ View Code

🕒 Problems 41–50

#	Problem	Main concept	🔗
41	Convert Hours To Weeks And Days	Unit conversion	▶ View Code
42	Task Duration In Seconds	Time conversion	▶ View Code
43	Convert Seconds To Days, Hours, Minutes, Seconds	Decomposition and conversion	▶ View Code
44	Week Day Menu	Menu and switch	▶ View Code
45	Month Menu	Menu and switch	▶ View Code
46	Print Letters A To Z	Character loops	▶ View Code
47	Loan Settlement In Months	Arithmetic and division	▶ View Code
48	Loan Installment By Months	Arithmetic and payment logic	▶ View Code
49	ATM PIN Check	Conditions and authentication logic	▶ View Code
50	ATM PIN With 3 Attempts	Loops and validation	▶ View Code

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🧠 Skills Covered

✅ Functions	✅ Structs	✅ Enums	✅ Conditions
✅ Loops	✅ Validation	✅ Arrays	✅ Strings
✅ Arithmetic	✅ Geometry	✅ Menus	✅ Basic Algorithms

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📁 Repository Structure

Algorithms-Problem-Solving-Level-1/
│
├── Problem-01-Print-Name/
│   └── Solution-01.cpp
│
├── Problem-02-Read-And-Print-Name/
│   └── Solution-01.cpp
│
├── ...
│
├── Problem-50-ATM-PIN-With-3-Attempts/
│   └── Solution-01.cpp
│
└── README.md

🔁 Solution Organization

When a problem has multiple approaches, they remain as separate files instead of overwriting each other. This makes comparison and review easier.

🧹 Naming Convention

Folders and source files use clean - separators instead of spaces or unnecessary special characters. The result is simpler paths for GitHub, terminals, IDEs, and local compilation.

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🚀 Recommended Learning Flow

Read the problem → Try it yourself → Run your solution → Compare alternatives → Refactor → Move to the next problem.

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📘 Learn • 💻 Practice • 🧠 Solve • 🚀 Build