I've made adjustments to improve readability, remove redundancy, and…

[Anshuman7080]

… maintain best practices

Simplified Output Statements: Cleaned up output statements for clarity.

Range-Based For Loops: Used range-based for loops for simplicity and readability when iterating through vectors.

Iterator Safety: Added checks to avoid dereferencing the end() iterator directly, preventing potential runtime errors.

Const References: Used const auto& in range-based for loops to avoid unnecessary copies, improving performance slightly when dealing with larger types.

Consistent Formatting: Improved formatting for better readability.

Complexity:
The time complexity for most operations like insertion, deletion, and accessing elements remains O(n) in the worst case due to the underlying array structure of vectors.
The space complexity is O(n) where n is the number of elements in the vector.
This version maintains the functionality of your original code while being cleaner and more efficient.