day 11
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2ba25a192c
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2e1d7e2f84
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@ -0,0 +1,201 @@
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package main
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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"time"
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)
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func mustAtoi(line string) int {
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i, _ := strconv.Atoi(line)
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return i
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}
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func main() {
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start := time.Now()
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partOne()
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duration := time.Since(start)
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partTwo()
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duration2 := time.Since(start)
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fmt.Printf("p1: %s, p2: %s\n", duration, duration2-duration)
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}
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func makeScanner(test bool) *bufio.Scanner {
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var f *os.File
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if test {
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f, _ = os.Open("inputs/testinput")
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} else {
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f, _ = os.Open("inputs/input")
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}
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reader := bufio.NewReader(f)
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return bufio.NewScanner(reader)
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}
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type monkey struct {
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items []int
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operation string // either "plus", "times", or "square"
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value int // ignored for "square"
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test int // "divisible by <test>"
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testpass int // monkey to throw to if test passes
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testfail int // monkey to throw to if test fails
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inspections int
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}
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func partOne() {
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scanner := makeScanner(false)
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currentMonkey := 0
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monkeys := []monkey{}
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// parse monkeys
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for scanner.Scan() {
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line := scanner.Text()
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switch {
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case strings.HasPrefix(line, "M"):
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currentMonkey = mustAtoi(strings.Trim(line, "Monkey :"))
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monkeys = append(monkeys, monkey{items: make([]int, 0)})
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case strings.HasPrefix(line, " S"):
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_, after, _ := strings.Cut(line, ":")
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items := strings.Split(after, ",")
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for _, i := range items {
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monkeys[currentMonkey].items = append(monkeys[currentMonkey].items, mustAtoi(strings.TrimSpace(i)))
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}
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case strings.HasPrefix(line, " O"):
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if strings.Contains(line, "+") {
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monkeys[currentMonkey].operation = "plus"
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l := strings.Split(line, " ")
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monkeys[currentMonkey].value = mustAtoi(l[len(l)-1])
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} else if strings.Contains(line, "old * old") {
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monkeys[currentMonkey].operation = "square"
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} else if strings.Contains(line, "*") {
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monkeys[currentMonkey].operation = "times"
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l := strings.Split(line, " ")
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monkeys[currentMonkey].value = mustAtoi(l[len(l)-1])
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}
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case strings.HasPrefix(line, " T"):
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l := strings.Split(line, " ")
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monkeys[currentMonkey].test = mustAtoi(l[len(l)-1])
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case strings.HasPrefix(line, " If t"):
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l := strings.Split(line, " ")
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monkeys[currentMonkey].testpass = mustAtoi(l[len(l)-1])
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case strings.HasPrefix(line, " If f"):
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l := strings.Split(line, " ")
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monkeys[currentMonkey].testfail = mustAtoi(l[len(l)-1])
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}
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}
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for i := 0; i < 20; i++ {
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for m := range monkeys {
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monkeys[m].inspections += len(monkeys[m].items)
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for _, i := range monkeys[m].items {
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if monkeys[m].operation == "plus" {
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i = (i + monkeys[m].value) / 3
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}
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if monkeys[m].operation == "times" {
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i = (i * monkeys[m].value) / 3
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}
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if monkeys[m].operation == "square" {
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i = (i * i) / 3
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}
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if i%monkeys[m].test == 0 {
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monkeys[monkeys[m].testpass].items = append(monkeys[monkeys[m].testpass].items, i)
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} else {
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monkeys[monkeys[m].testfail].items = append(monkeys[monkeys[m].testfail].items, i)
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}
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}
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monkeys[m].items = []int{}
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}
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}
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one, two := 0, 0
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for _, m := range monkeys {
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if m.inspections > one && m.inspections > two {
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one, two = two, m.inspections
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} else if m.inspections > one {
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one = m.inspections
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}
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}
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fmt.Println(one * two)
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}
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func partTwo() {
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scanner := makeScanner(false)
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currentMonkey := 0
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monkeys := []monkey{}
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// parse monkeys
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for scanner.Scan() {
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line := scanner.Text()
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switch {
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case strings.HasPrefix(line, "M"):
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currentMonkey = mustAtoi(strings.Trim(line, "Monkey :"))
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monkeys = append(monkeys, monkey{items: make([]int, 0)})
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case strings.HasPrefix(line, " S"):
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_, after, _ := strings.Cut(line, ":")
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items := strings.Split(after, ",")
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for _, i := range items {
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monkeys[currentMonkey].items = append(
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monkeys[currentMonkey].items, mustAtoi(strings.TrimSpace(i)),
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)
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}
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case strings.HasPrefix(line, " O"):
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if strings.Contains(line, "+") {
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monkeys[currentMonkey].operation = "plus"
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l := strings.Split(line, " ")
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monkeys[currentMonkey].value = mustAtoi(l[len(l)-1])
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} else if strings.Contains(line, "old * old") {
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monkeys[currentMonkey].operation = "square"
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} else if strings.Contains(line, "*") {
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monkeys[currentMonkey].operation = "times"
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l := strings.Split(line, " ")
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monkeys[currentMonkey].value = mustAtoi(l[len(l)-1])
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}
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case strings.HasPrefix(line, " T"):
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l := strings.Split(line, " ")
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monkeys[currentMonkey].test = mustAtoi(l[len(l)-1])
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case strings.HasPrefix(line, " If t"):
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l := strings.Split(line, " ")
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monkeys[currentMonkey].testpass = mustAtoi(l[len(l)-1])
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case strings.HasPrefix(line, " If f"):
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l := strings.Split(line, " ")
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monkeys[currentMonkey].testfail = mustAtoi(l[len(l)-1])
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}
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}
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common := 1
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for i := range monkeys {
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common = common * monkeys[i].test
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}
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for j := 0; j < 10000; j++ {
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for m := range monkeys {
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monkeys[m].inspections += len(monkeys[m].items)
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for _, i := range monkeys[m].items {
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if monkeys[m].operation == "plus" {
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i = i + monkeys[m].value
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}
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if monkeys[m].operation == "times" {
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i = i * monkeys[m].value
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}
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if monkeys[m].operation == "square" {
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i = i * i
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}
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if i%monkeys[m].test == 0 {
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monkeys[monkeys[m].testpass].items = append(monkeys[monkeys[m].testpass].items, i%common)
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} else {
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monkeys[monkeys[m].testfail].items = append(monkeys[monkeys[m].testfail].items, i%common)
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}
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}
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monkeys[m].items = []int{}
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}
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}
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one, two := 0, 0
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for _, m := range monkeys {
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if m.inspections > one && m.inspections > two {
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one, two = two, m.inspections
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} else if m.inspections > one {
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one = m.inspections
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}
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}
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fmt.Println(one * two)
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}
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@ -0,0 +1,38 @@
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#![allow(dead_code)]
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use std::fs::File;
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use std::io;
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use std::io::BufRead;
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use std::path::Path;
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use std::time::Instant;
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fn main() {
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let now = Instant::now();
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part_one();
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let part_one_duration = now.elapsed();
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part_two();
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let part_two_duration = now.elapsed();
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println!(
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"p1: {}ms, p2: {}ms",
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part_one_duration.as_millis(),
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(part_two_duration - part_one_duration).as_millis()
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);
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}
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fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
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where
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P: AsRef<Path>,
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{
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// note that this discards a final newline
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let file = File::open(filename)?;
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Ok(io::BufReader::new(file).lines())
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}
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fn part_one() {
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if let Ok(lines) = read_lines("./inputs/input") {
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for line in lines {
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// do stuff
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}
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}
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}
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fn part_two() {}
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@ -0,0 +1,50 @@
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package main
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"time"
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)
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func mustAtoi(line string) int {
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i, _ := strconv.Atoi(line)
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return i
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}
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func main() {
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start := time.Now()
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partOne()
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duration := time.Since(start)
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partTwo()
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duration2 := time.Since(start)
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fmt.Printf("p1: %s, p2: %s\n", duration, duration2-duration)
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}
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func makeScanner(test bool) *bufio.Scanner {
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var f *os.File
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if test {
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f, _ = os.Open("inputs/testinput")
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} else {
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f, _ = os.Open("inputs/input")
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}
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reader := bufio.NewReader(f)
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return bufio.NewScanner(reader)
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}
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func partOne() {
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scanner := makeScanner(false)
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for scanner.Scan() {
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// line := scanner.Text()
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}
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}
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func partTwo() {
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scanner := makeScanner(false)
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for scanner.Scan() {
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// line := scanner.Text()
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}
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}
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