User: creamsnail

creamsnail

13 hours, 51 minutes ago

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I probably did not follow the prescribed way to accomplish these. But I did them, and that's all that really matters. I hope to see other versions for those who are doing it in Rust. I think I saw...

I probably did not follow the prescribed way to accomplish these. But I did them, and that's all that really matters.

I hope to see other versions for those who are doing it in Rust. I think I saw two other folks on here mention trying it this year, hopefully it'll inspire them to post their solutions when or if they can (no pressure).

Parts 1 and 2 (with tests)

Also I thought it was kind of cute that the second part's hex `0x434C49434B` decodes to `CLICK`

https://cyberchef.org/#recipe=From_Hex('Auto')&input=MHg0MzRDNDk0MzRC

use std::fs::read_to_string;

const test_file: &str = "example_input.txt";
const puzzle_input: &str = "puzzle_input.txt";

fn main() {
    // PART ONE
    let part_one_start = 50;
    let part_one_answer = part_one(read_puzzle_input(puzzle_input), part_one_start);
    println!("The answer to part one is: {}", part_one_answer);

    let part_two_start: usize = 50;
    let part_two_answer = part_two(read_puzzle_input(puzzle_input), part_two_start);
    println!("The answer to part two is: {}", part_two_answer)
}

// Reads in the puzzle input text file which contains the D##
fn read_puzzle_input(file_name: &str) -> Vec<String> {
    return read_to_string(file_name)
        .unwrap()
        .lines()
        .map(String::from)
        .collect();
}

fn part_one(instruction: Vec<String>, start_point: usize) -> i32 {
    let mut dial = vec![
        "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16",
        "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31",
        "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46",
        "47", "48", "49", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "60", "61",
        "62", "63", "64", "65", "66", "67", "68", "69", "70", "71", "72", "73", "74", "75", "76",
        "77", "78", "79", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "90", "91",
        "92", "93", "94", "95", "96", "97", "98", "99",
    ];
    dial.rotate_left(start_point);

    // Keep track of how many times we hit 0
    let mut count = 0;

    // Iterate over the instructions
    for line in instruction {
        let (direction, number) = line.split_at(1);
        // Set the number to a digit so we can rotate the dial
        let num: usize = number.parse::<usize>().unwrap();
        if direction == "R" {
            for _ in 0..num {
                dial.rotate_left(1)
            }
        } else if direction == "L" {
            for _ in 0..num {
                dial.rotate_right(1)
            }
        }
        if dial[0] == "0" {
            count += 1;
        }
    }
    return count;
}

fn part_two(instruction: Vec<String>, start_point: usize) -> i32 {
    let mut dial = vec![
        "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16",
        "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31",
        "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46",
        "47", "48", "49", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "60", "61",
        "62", "63", "64", "65", "66", "67", "68", "69", "70", "71", "72", "73", "74", "75", "76",
        "77", "78", "79", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "90", "91",
        "92", "93", "94", "95", "96", "97", "98", "99",
    ];
    dial.rotate_left(start_point);

    // Keep track of how many times we hit 0
    let mut count = 0;

    // Iterate over the instructions
    for line in instruction {
        let (direction, number) = line.split_at(1);
        // Set the number to a digit so we can rotate the dial
        let num: usize = number.parse::<usize>().unwrap();
        if direction == "R" {
            for _ in 0..num {
                dial.rotate_left(1);
                if dial[0] == "0" {
                    count += 1;
                }
            }
        } else if direction == "L" {
            for _ in 0..num {
                dial.rotate_right(1);
                if dial[0] == "0" {
                    count += 1;
                }
            }
        }
    }
    return count;
}

#[test]
fn part_one_example() {
    let instruction = read_puzzle_input(test_file);
    let start_point: usize = 50;
    assert_eq!(part_one(instruction, start_point), 3);
}

#[test]
fn part_two_example() {
    let instruction = read_puzzle_input(test_file);
    let start_point: usize = 50;
    assert_eq!(part_two(instruction, start_point), 6);
}

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