AdventOfCode2021/21/main.go

package main

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

func mustAtoi(line string) int {
	i, _ := strconv.Atoi(line)
	return i
}

func main() {
	start := time.Now()
	partOne()
	duration := time.Since(start)
	partTwo()
	duration2 := time.Since(start)
	fmt.Printf("p1: %s, p2: %s\n", duration, duration2-duration)
}

func makeScanner(test bool) *bufio.Scanner {
	var f *os.File
	if test {
		f, _ = os.Open("inputs/testinput")
	} else {
		f, _ = os.Open("inputs/input")
	}
	reader := bufio.NewReader(f)
	return bufio.NewScanner(reader)
}

func MakeDeterministicDie(max int) func() int {
	currentDieValue := 0
	return func() int {
		if currentDieValue >= max {
			currentDieValue = 0
		}
		currentDieValue++
		return currentDieValue
	}
}

func RollThree(f func() int) int {
	return f() + f() + f()
}

func partOne() {
	scanner := makeScanner(false)

	scanner.Scan()
	player1 := mustAtoi(strings.Split(scanner.Text(), " ")[4])
	scanner.Scan()
	player2 := mustAtoi(strings.Split(scanner.Text(), " ")[4])

	die := MakeDeterministicDie(100)
	score1 := 0
	score2 := 0
	rolls := 0

	for {
		player1 = player1 + RollThree(die)
		rolls += 3
		for player1 > 10 {
			player1 -= 10
		}
		score1 += player1
		if score1 >= 1000 {
			fmt.Println(score2 * rolls)
			break
		}
		player2 = player2 + RollThree(die)
		rolls += 3
		for player2 > 10 {
			player2 -= 10
		}
		score2 += player2
		if score2 >= 1000 {
			fmt.Println(score1 * rolls)
			break
		}
	}
}

func partTwo() {
	scanner := makeScanner(false)

	for scanner.Scan() {
		// line := scanner.Text()
	}
}