Train Algorithm

A collection of educational algorithms in Python for practicing basic programming concepts.

📋 Requirements

• Python 3.6 or higher

🚀 Installation and Setup

Step 1: Clone the repository (if needed)

git clone <repository-url>
cd train_algoritm

Step 2: Create a virtual environment

python3 -m venv venv

Step 3: Activate the virtual environment

On macOS/Linux:

source venv/bin/activate

On Windows:

venv\Scripts\activate

After activation, you'll see (venv) at the beginning of your terminal prompt.

Step 4: Install dependencies

pip install -r requirements.txt

Step 5: Run the program

python train_algorithm.py

Deactivate the virtual environment

When you're done working:

deactivate

📝 Available Algorithms

1. Even or Odd

   • Input a number and determine if it's even or odd.
   • Example:
     • Input: 7
     • Output: Odd

2. Sum of Numbers from 1 to n

   • Calculate the sum from 1 up to the given number n.
   • Example:
     • Input: 10
     • Output: 55

3. Factorial

   • Calculate the factorial of a given number.
   • Example:
     • Input: 5
     • Output: 120

4. Reverse String

   • Input a string and get its reverse.
   • Example:
     • Input: hello
     • Output: olleh

5. Palindrome Check

   • Check if the input string is a palindrome (ignores spaces and case).
   • Example:
     • Input: Race car
     • Output: Palindrome

6. Average of Numbers in a List

   • Calculate the arithmetic mean (average) of a list of numbers entered separated by commas or spaces.
   • Example:
     • Input: 1, 2, 3, 4, 5
     • Output: 3.0

7. Find Maximum Number in a List

   • Find the largest number in a list of numbers entered separated by commas or spaces.
   • Example:
     • Input: 1, 7, 3, 4, 5
     • Output: 7

8. Count Occurrences of a Number in a List

   • Count how many times a specific number appears in a list of numbers entered separated by commas or spaces.
   • Example:
     • Input numbers: 1, 2, 3, 2, 4, 2
     • Input number to count: 2
     • Output: 3

9. Get Even Numbers from a List

   • Return all even numbers from a list entered separated by commas or spaces.
   • Example:
     • Input: 1, 2, 3, 4, 5, 6
     • Output: 2, 4, 6

10. Get Unique Numbers from a List

    • Return all unique numbers from a list entered separated by commas or spaces, preserving their order.
    • Example:
      • Input: 1, 2, 2, 3, 4, 3, 5
      • Output: 1, 2, 3, 4, 5

11. NBU Currency Exchange Rates

    • Fetch current exchange rates from the National Bank of Ukraine API for USD and EUR.
    • No input required - automatically displays current rates.
    • Example output:

      ┌─────────────────────────┐
      │ 💰 Currency: USD        │
      │ 💵 Exchange: 41.2215    │
      │ 📅 Date: 02.10.2025     │
      └─────────────────────────┘
      

12. 🎯 Two Sum (LeetCode #1)

    • Classic LeetCode problem for algorithm practice.
    • Given an array of integers and a target sum, find the indices of two numbers that add up to the target.
    • Uses nested loops approach (Brute Force) with O(n²) time complexity.
    • Great for learning array manipulation and enumerate() function.
    • Example:
      • Input numbers: 2, 7, 11, 15
      • Input target: 9
      • Output: 0 1 (because nums[0] + nums[1] = 2 + 7 = 9)

💡 Usage

Run the script and choose an algorithm by name or number:

python train_algorithm.py

When prompted, enter one of the following:

• one or 1 for Even or Odd
• two or 2 for Sum of Numbers
• three or 3 for Factorial
• four or 4 for Reverse String
• five or 5 for Palindrome Check
• six or 6 for Average of Numbers in a List
• seven or 7 for Find Maximum Number in a List
• eight or 8 for Count Occurrences of a Number in a List
• nine or 9 for Get Even Numbers from a List
• ten or 10 for Get Unique Numbers from a List
• eleven or 11 for NBU Currency Exchange Rates
• twelve or 12 for Two Sum (LeetCode #1)

📖 Examples

Example 1: Palindrome Check

$ python train_algorithm.py
Write algorithm number(one, two, three ... etc): five
Write string: Race car
Palindrome

Example 2: NBU Currency Rates

$ python train_algorithm.py
Write algorithm number(one, two, three ... etc): 11
┌─────────────────────────┐
│ 💰 Currency: USD        │
│ 💵 Exchange: 41.2215    │
│ 📅 Date: 02.10.2025     │
└─────────────────────────┘

┌─────────────────────────┐
│ 💰 Currency: EUR        │
│ 💵 Exchange: 48.3734    │
│ 📅 Date: 02.10.2025     │
└─────────────────────────┘

🛠️ Project Structure

train_algoritm/
├── README.md              # Project documentation
├── train_algorithm.py     # Main program with all algorithms
├── requirements.txt       # Python dependencies
└── venv/                  # Virtual environment (created by you)

📚 Notes

• Most algorithms use only Python's standard library (re module for regex)
• Algorithm #11 requires the requests library for API calls to NBU
• External packages are listed in requirements.txt
• Virtual environment is recommended but optional
• All algorithms include basic error handling for invalid inputs

📄 License

This is an educational project for learning purposes.