using only vim neovim to solve advent of code episode 2

sure! advent of code is a fun series of programming puzzles that can be solved using various programming languages. episode 2 of the advent of code typically involves reading input, performing some calculations, and outputting results. in this tutorial, i will guide you through solving a generic problem using neovim, focusing on the functionalities of neovim and vim.

step-by-step tutorial

step 1: set up your environment

1. **open neovim**: launch neovim in your terminal by typing:


2. **basic file operations**:
- **insert mode**: press `i` to enter insert mode, where you can type your code.
- **normal mode**: press `esc` to return to normal mode, which allows you to navigate and perform commands.

step 2: read the input

assuming that the puzzle requires reading input from a file, you can create a function to read the input. here’s an example of how to read lines from a file and process them.

step 3: process the input

let’s say the problem involves calculating the total of a series of numbers from the input. you can define a function to process this data.

step 4: main function

combine the reading and processing functions into a main block that executes when the script is run.

step 5: save and run your code

1. **save your file**: in normal mode, type `:w` and press `enter` to save your changes.

2. **run your code**: exit neovim by typing `:q` and running your script from the terminal:


step 6: additional neovim tips

- **navigation**: use `h`, `j`, `k`, `l` to move left, down, up, and right.
- **undo changes**: press `u` in normal mode to undo changes.
- **search**: press `/` followed by the text you want to search for, and hit `enter`.
- **line numbers**: you can enable line numbers by typing `:set number`.

complete code example

here’s ...

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