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This is my first ever year actually doing this. I considered maybe working on goputer so I complete it using that, but considering I had never done it before and didn't know what it was going to be like, and the fact that there were still some bugs (my fault) with the runtime that couldn't be ironed out before it started, I ended up using Go.

My solution for day 1 is below, and it definitely isn't the best, (I saw solutions written using one shell command on the golang discord.), and this one that took 2.5ms to run. My original solution below took 2-3ms to run on average according to the time command. Also below is my more "optimized" solution which managed to reduce the time to around 1ms. The biggest source of noise and delay was actually reading the file in, this lead to a 1ms reduction in runtime.

First solution

Original: GitHub

package main

import (
    "fmt"
    "os"
    "strconv"
    "strings"
)

const integers = "1234567890"

var words []string = []string{"one", "two", "three", "four", "five", "six", "seven", "eight", "nine"}
var word_digits []string = []string{"1", "2", "3", "4", "5", "6", "7", "8", "9"}

func main() {

    var input_name string
    fmt.Println("Input file name:")
    fmt.Scanln(&input_name)

    input_data, err := os.ReadFile(input_name)
    if err != nil {
        fmt.Printf("No input called: %s", input_name)
    }

    input_string := string(input_data)

    var total int

    for _, line := range strings.Split(input_string, "\n") {

        var line_numbers []string = make([]string, 0)

        for i := 0; i < len(line); i++ {

            if strings.Contains(integers, string(line[i])) { //Words can't start with integers.

                line_numbers = append(line_numbers, string(line[i]))

            } else {

                for j := 0; j < len(words); j++ {

                    if i+len(words[j]) < len(line)+1 {

                        if string(line[i:i+len(words[j])]) == words[j] {

                            line_numbers = append(line_numbers, word_digits[j])

                        }

                    }

                }

            }

        }

        if len(line_numbers) == 0 {
            continue
        } else if len(line_numbers) == 1 {

            i, _ := strconv.Atoi(line_numbers[0] + line_numbers[0])
            total += i
            fmt.Println(i)

        } else {

            i, _ := strconv.Atoi(line_numbers[0] + line_numbers[len(line_numbers)-1])
            total += i
            fmt.Println(i)

        }

    }

    fmt.Println(total)

}

Second solution

Original: GitHub

package main

import (
    _ "embed"
    "fmt"
    "strconv"
    "strings"
    "time"
)

const integers = "1234567890"

var words []string = []string{"one", "two", "three", "four", "five", "six", "seven", "eight", "nine"}
var word_lengths []int = []int{3, 3, 5, 4, 4, 3, 5, 5, 4}
var word_digits []string = []string{"1", "2", "3", "4", "5", "6", "7", "8", "9"}

//go:embed calibration.txt
var input_string string
var total int

func main() {

    start := time.Now()

    for _, line := range strings.Split(input_string, "\n") {

        var line_numbers []string = make([]string, 0)
        var line_length int = len(line)

        for i := 0; i < line_length; i++ {

            if strings.Contains(integers, string(line[i])) { //Words can't start with integers.

                line_numbers = append(line_numbers, string(line[i]))

            } else {

                for j := 0; j < 9; j++ {

                    if i+word_lengths[j] < line_length+1 {

                        if string(line[i:i+word_lengths[j]]) == words[j] {

                            line_numbers = append(line_numbers, word_digits[j])

                        }

                    }

                }

            }

        }

        if len(line_numbers) == 0 {
            continue
        } else if len(line_numbers) == 1 {

            i, _ := strconv.Atoi(line_numbers[0] + line_numbers[0])
            total += i

        } else {

            i, _ := strconv.Atoi(line_numbers[0] + line_numbers[len(line_numbers)-1])
            total += i

        }

    }

    used := time.Since(start)
    fmt.Println("Time used:", used)

    fmt.Println(total)

}

I probably won't update this with solutions to the other days in the challenge however I will post them on on this git repo.

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