2022 Day 16 Complete
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Valve AP has flow rate=0; tunnels lead to valves AA, ON
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Valve QN has flow rate=21; tunnels lead to valves RI, CG
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Valve LK has flow rate=0; tunnels lead to valves XM, AA
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Valve HA has flow rate=0; tunnels lead to valves WH, KF
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Valve DS has flow rate=16; tunnel leads to valve II
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Valve KD has flow rate=0; tunnels lead to valves KG, QB
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Valve JW has flow rate=0; tunnels lead to valves AD, KF
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Valve HU has flow rate=0; tunnels lead to valves UK, CO
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Valve AE has flow rate=10; tunnels lead to valves IR, PT, UV
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Valve XA has flow rate=0; tunnels lead to valves CG, EU
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Valve SE has flow rate=17; tunnels lead to valves YR, AD
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Valve TR has flow rate=0; tunnels lead to valves AL, CS
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Valve BS has flow rate=0; tunnels lead to valves YH, XM
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Valve IJ has flow rate=24; tunnels lead to valves XN, WE
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Valve AA has flow rate=0; tunnels lead to valves LK, AP, IZ, PC, QD
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Valve KG has flow rate=0; tunnels lead to valves KD, CS
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Valve QV has flow rate=0; tunnels lead to valves XM, II
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Valve PC has flow rate=0; tunnels lead to valves AA, YF
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Valve GJ has flow rate=20; tunnel leads to valve RI
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Valve UV has flow rate=0; tunnels lead to valves UK, AE
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Valve IR has flow rate=0; tunnels lead to valves EU, AE
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Valve EU has flow rate=13; tunnels lead to valves IR, DT, XA, ON
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Valve ED has flow rate=0; tunnels lead to valves XN, CO
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Valve DT has flow rate=0; tunnels lead to valves EU, UK
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Valve YE has flow rate=0; tunnels lead to valves XM, WS
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Valve AD has flow rate=0; tunnels lead to valves JW, SE
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Valve WE has flow rate=0; tunnels lead to valves IJ, NA
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Valve UK has flow rate=5; tunnels lead to valves UV, DT, QD, HU
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Valve YR has flow rate=0; tunnels lead to valves OS, SE
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Valve II has flow rate=0; tunnels lead to valves QV, DS
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Valve GT has flow rate=0; tunnels lead to valves CS, MN
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Valve YH has flow rate=0; tunnels lead to valves BS, QB
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Valve BQ has flow rate=0; tunnels lead to valves XM, KF
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Valve OS has flow rate=0; tunnels lead to valves YR, NA
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Valve WH has flow rate=0; tunnels lead to valves QB, HA
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Valve QB has flow rate=4; tunnels lead to valves WH, KD, YH, IZ
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Valve ON has flow rate=0; tunnels lead to valves AP, EU
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Valve IZ has flow rate=0; tunnels lead to valves AA, QB
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Valve MN has flow rate=25; tunnel leads to valve GT
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Valve CG has flow rate=0; tunnels lead to valves XA, QN
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Valve QD has flow rate=0; tunnels lead to valves UK, AA
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Valve AL has flow rate=0; tunnels lead to valves KF, TR
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Valve XN has flow rate=0; tunnels lead to valves ED, IJ
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Valve WS has flow rate=0; tunnels lead to valves YE, CS
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Valve CO has flow rate=18; tunnels lead to valves ED, PT, HU
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Valve PT has flow rate=0; tunnels lead to valves CO, AE
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Valve RI has flow rate=0; tunnels lead to valves QN, GJ
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Valve CS has flow rate=9; tunnels lead to valves YF, GT, WS, TR, KG
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Valve YF has flow rate=0; tunnels lead to valves PC, CS
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Valve NA has flow rate=23; tunnels lead to valves OS, WE
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Valve KF has flow rate=12; tunnels lead to valves HA, AL, JW, BQ
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Valve XM has flow rate=3; tunnels lead to valves LK, QV, YE, BS, BQ
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@ -2,111 +2,184 @@ package main
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import (
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import (
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"fmt"
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"fmt"
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"math"
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"regexp"
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"strconv"
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"strings"
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"strings"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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)
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var valveregexp = regexp.MustCompile(`([A-Z]{2}).*=(\d+);.*?((?:[A-Z]{2}(?:, )?)+)`)
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func main() {
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func main() {
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inp := h.StdinToStringSlice()
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rooms := parseRooms(h.StdinToStringSlice())
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part1(inp)
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graph := floydWarshall(rooms)
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v := NewVolcano(rooms, graph)
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r := part1(v)
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v = NewVolcano(rooms, graph)
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part2(v, r)
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}
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}
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func part1(inp []string) {
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func part1(v *Volcano) uint16 {
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volcano := NewVolcano(inp)
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var dfs func(target, pressure, minute, on, node uint16) uint16
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timeLeft := 30
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dfs = func(target, pressure, minute, on, node uint16) uint16 {
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currRoom := volcano.FindRoom("AA")
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max := pressure
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_, _ = timeLeft, currRoom
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for _, w := range v.goodbits {
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fmt.Println("Steps from AA -> JJ:", volcano.CountSteps("AA", "JJ"))
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if node == w[0] || w[0] == v.start || w[0]&on != 0 {
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continue
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}
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l := v.bitgraphs[node|w[0]] + 1
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if minute+l > target {
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continue
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}
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if next := dfs(target, pressure+(target-minute-l)*w[1], minute+l, on|w[0], w[0]); next > max {
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max = next
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}
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}
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return max
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}
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res := dfs(30, 0, 0, 0, v.start)
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fmt.Println("# Part 1")
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fmt.Println(res)
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return res
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}
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func part2(v *Volcano, p1 uint16) {
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var dfspaths func(target, pressure, minute, on, node, path uint16) [][2]uint16
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dfspaths = func(target, pressure, minute, on, node, path uint16) [][2]uint16 {
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paths := [][2]uint16{{pressure, path}}
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for _, w := range v.goodbits {
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if w[0] == node || w[0] == v.start || w[0]&on != 0 {
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continue
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}
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l := v.bitgraphs[node|w[0]] + 1
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if minute+l > target {
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continue
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}
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paths = append(paths, dfspaths(target, pressure+(target-minute-l)*w[1], minute+l, on|w[0], w[0], path|w[0])...)
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}
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return paths
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}
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allpaths := dfspaths(26, 0, 0, 0, v.start, 0)
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// reduce paths (presumably, both paths are at least half of part 1)
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var trimpaths [][2]uint16
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for _, p := range allpaths {
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if p[0] > p1/2 {
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trimpaths = append(trimpaths, p)
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}
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}
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// compare all paths to find max
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var max uint16 = 0
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for idx := 0; idx < len(trimpaths); idx += 1 {
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for jdx := idx + 1; jdx < len(trimpaths); jdx += 1 {
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if trimpaths[idx][1]&trimpaths[jdx][1] != 0 {
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continue
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}
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if m := trimpaths[idx][0] + trimpaths[jdx][0]; m > max {
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max = m
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}
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}
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}
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fmt.Println("# Part 2")
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fmt.Println(max)
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}
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}
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type Volcano struct {
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type Volcano struct {
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rooms []*Room
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start uint16
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goodrooms []*Room
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goodbits [][2]uint16
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bitfield map[*Room]uint16
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bitgraphs []uint16
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}
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}
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func NewVolcano(inp []string) *Volcano {
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func NewVolcano(rooms []*Room, graph map[*Room]map[*Room]uint16) *Volcano {
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v := &Volcano{}
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v := Volcano{}
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for i := range inp {
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v.rooms = append(v.rooms, StringToRoom(inp[i]))
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// pick valves with flow and starting point
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}
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for _, r := range rooms {
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for i := range v.rooms {
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if r.Rate > 0 || r.Name == "AA" {
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for _, valve := range v.rooms[i].RawTunnels {
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v.goodrooms = append(v.goodrooms, r)
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v.rooms[i].Tunnels = append(v.rooms[i].Tunnels, v.FindRoom(valve))
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}
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}
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}
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}
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return v
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}
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func (v *Volcano) CountSteps(from string, to string) int {
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// assign bits
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start, end := v.FindRoom(from), v.FindRoom(to)
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v.bitfield = make(map[*Room]uint16)
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if start == nil || end == nil {
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for idx, r := range v.goodrooms {
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fmt.Println("Couldn't find requested rooms:", from, ":", start, " ; ", to, ":", end)
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v.bitfield[r] = 1 << idx
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return math.MaxInt
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}
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}
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return v.TrackStepCount(start, end, []*Room{})
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}
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func (v *Volcano) TrackStepCount(from *Room, to *Room, visited []*Room) int {
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// find start
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if from == to {
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for _, r := range v.goodrooms {
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return 0
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if r.Name == "AA" {
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}
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v.start = v.bitfield[r]
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minSteps := math.MaxInt
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break
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for _, t := range from.Tunnels {
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fmt.Println("TrackStepCount:", from, "->", to, "::", t)
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if !IsRoomIn(t, visited) {
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fmt.Println(" Haven't Visited")
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wrk := v.TrackStepCount(t, to, append(visited, t)) + 1
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fmt.Println(" From", from, "to", to, "in", wrk)
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minSteps = h.Min(minSteps, wrk)
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}
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}
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}
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}
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return minSteps
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}
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func (v *Volcano) FindRoom(valve string) *Room {
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// create slice for fast edge lookup
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for _, r := range v.rooms {
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v.bitgraphs = make([]uint16, 0xffff)
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if r.Valve == valve {
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for _, v1 := range v.goodrooms {
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return r
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for _, v2 := range v.goodrooms {
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v.bitgraphs[v.bitfield[v1]|v.bitfield[v2]] = graph[v1][v2]
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}
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}
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}
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}
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return nil
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}
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func IsRoomIn(room *Room, rooms []*Room) bool {
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// create slice for fast node lookup
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for i := range rooms {
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v.goodbits = make([][2]uint16, len(v.goodrooms))
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if rooms[i] == room {
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for idx, r := range v.goodrooms {
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return true
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v.goodbits[idx] = [2]uint16{v.bitfield[r], r.Rate}
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}
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}
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}
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return false
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return &v
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}
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}
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type Room struct {
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type Room struct {
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Valve string
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Name string
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FlowRate int
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Rate uint16
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RawTunnels []string
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Edges string
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Tunnels []*Room
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}
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}
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func StringToRoom(s string) *Room {
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func parseRooms(inp []string) []*Room {
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room := &Room{}
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rooms := make([]*Room, len(inp))
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r := strings.NewReader(s)
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for idx, line := range inp {
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fmt.Fscanf(r, "Valve %s has flow rate=%d; tunnels lead to valve", &room.Valve, &room.FlowRate)
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m := valveregexp.FindStringSubmatch(line)
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readTunnels := strings.Split(s, " valve")[1]
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i, _ := strconv.Atoi(m[2])
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if readTunnels[0] == ' ' {
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rooms[idx] = &Room{Name: m[1], Rate: uint16(i), Edges: m[3]}
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readTunnels = readTunnels[1:]
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} else {
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readTunnels = readTunnels[2:]
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}
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}
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room.RawTunnels = strings.Split(readTunnels, ", ")
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return rooms
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return room
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}
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}
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func (r Room) String() string {
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func floydWarshall(valves []*Room) map[*Room]map[*Room]uint16 {
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return r.Valve
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graph := make(map[*Room]map[*Room]uint16)
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}
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for _, v1 := range valves {
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graph[v1] = make(map[*Room]uint16)
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for _, v2 := range valves {
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if v1 == v2 {
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graph[v1][v2] = 0
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} else if strings.Contains(v1.Edges, v2.Name) {
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graph[v1][v2] = 1
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} else {
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graph[v1][v2] = 0xff
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}
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}
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}
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func (r Room) FullString() string {
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for _, k := range valves {
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return fmt.Sprintf("Valve %s has flow rate=%d; tunnels lead to valves %v", r.Valve, r.FlowRate, r.RawTunnels)
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for _, i := range valves {
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for _, j := range valves {
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if graph[i][j] > graph[i][k]+graph[k][j] {
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graph[i][j] = graph[i][k] + graph[k][j]
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}
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}
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}
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}
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return graph
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}
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}
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@ -1,46 +1,24 @@
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Advent of Code
|
Advent of Code
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br0xen (AoC++) 47*
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• [About]
|
|
||||||
• [Events]
|
|
||||||
• [Shop]
|
|
||||||
• [Settings]
|
|
||||||
• [Log Out]
|
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||||||
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br0xen (AoC++) 29*
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/^2022$/
|
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• [Calendar]
|
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||||||
• [AoC++]
|
|
||||||
• [Sponsors]
|
|
||||||
• [Leaderboard]
|
|
||||||
• [Stats]
|
|
||||||
|
|
||||||
Our sponsors help make Advent of Code possible:
|
|
||||||
Sentry.io - More than 3.5 million developers across 85,000 organizations ship better software, faster, with Sentry. What
|
|
||||||
are you waiting for?
|
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--- Day 16: Proboscidea Volcanium ---
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--- Day 16: Proboscidea Volcanium ---
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The sensors have led you to the origin of the distress signal: yet another handheld device, just like the one the Elves
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The sensors have led you to the origin of the distress signal: yet another handheld device, just like the one the Elves gave you. However, you don't see
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gave you. However, you don't see any Elves around; instead, the device is surrounded by elephants! They must have gotten
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any Elves around; instead, the device is surrounded by elephants! They must have gotten lost in these tunnels, and one of the elephants apparently
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lost in these tunnels, and one of the elephants apparently figured out how to turn on the distress signal.
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figured out how to turn on the distress signal.
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The ground rumbles again, much stronger this time. What kind of cave is this, exactly? You scan the cave with your
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The ground rumbles again, much stronger this time. What kind of cave is this, exactly? You scan the cave with your handheld device; it reports mostly
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handheld device; it reports mostly igneous rock, some ash, pockets of pressurized gas, magma... this isn't just a cave,
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igneous rock, some ash, pockets of pressurized gas, magma... this isn't just a cave, it's a volcano!
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it's a volcano!
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You need to get the elephants out of here, quickly. Your device estimates that you have 30 minutes before the volcano
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You need to get the elephants out of here, quickly. Your device estimates that you have 30 minutes before the volcano erupts, so you don't have time to
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erupts, so you don't have time to go back out the way you came in.
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go back out the way you came in.
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You scan the cave for other options and discover a network of pipes and pressure-release valves. You aren't sure how
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You scan the cave for other options and discover a network of pipes and pressure-release valves. You aren't sure how such a system got into a volcano,
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such a system got into a volcano, but you don't have time to complain; your device produces a report (your puzzle input)
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but you don't have time to complain; your device produces a report (your puzzle input) of each valve's flow rate if it were opened (in pressure per
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of each valve's flow rate if it were opened (in pressure per minute) and the tunnels you could use to move between the
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minute) and the tunnels you could use to move between the valves.
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valves.
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There's even a valve in the room you and the elephants are currently standing in labeled AA. You estimate it will take
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There's even a valve in the room you and the elephants are currently standing in labeled AA. You estimate it will take you one minute to open a single
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you one minute to open a single valve and one minute to follow any tunnel from one valve to another. What is the most
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valve and one minute to follow any tunnel from one valve to another. What is the most pressure you could release?
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pressure you could release?
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For example, suppose you had the following scan output:
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For example, suppose you had the following scan output:
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|
@ -55,16 +33,14 @@
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Valve II has flow rate=0; tunnels lead to valves AA, JJ
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Valve II has flow rate=0; tunnels lead to valves AA, JJ
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Valve JJ has flow rate=21; tunnel leads to valve II
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Valve JJ has flow rate=21; tunnel leads to valve II
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||||||
All of the valves begin closed. You start at valve AA, but it must be damaged or jammed or something: its flow rate is
|
All of the valves begin closed. You start at valve AA, but it must be damaged or jammed or something: its flow rate is 0, so there's no point in opening
|
||||||
0, so there's no point in opening it. However, you could spend one minute moving to valve BB and another minute opening
|
it. However, you could spend one minute moving to valve BB and another minute opening it; doing so would release pressure during the remaining 28
|
||||||
it; doing so would release pressure during the remaining 28 minutes at a flow rate of 13, a total eventual pressure
|
minutes at a flow rate of 13, a total eventual pressure release of 28 * 13 = 364. Then, you could spend your third minute moving to valve CC and your
|
||||||
release of 28 * 13 = 364. Then, you could spend your third minute moving to valve CC and your fourth minute opening it,
|
fourth minute opening it, providing an additional 26 minutes of eventual pressure release at a flow rate of 2, or 52 total pressure released by valve
|
||||||
providing an additional 26 minutes of eventual pressure release at a flow rate of 2, or 52 total pressure released by
|
CC.
|
||||||
valve CC.
|
|
||||||
|
|
||||||
Making your way through the tunnels like this, you could probably open many or all of the valves by the time 30 minutes
|
Making your way through the tunnels like this, you could probably open many or all of the valves by the time 30 minutes have elapsed. However, you need
|
||||||
have elapsed. However, you need to release as much pressure as possible, so you'll need to be methodical. Instead,
|
to release as much pressure as possible, so you'll need to be methodical. Instead, consider this approach:
|
||||||
consider this approach:
|
|
||||||
|
|
||||||
== Minute 1 ==
|
== Minute 1 ==
|
||||||
No valves are open.
|
No valves are open.
|
||||||
|
|
@ -184,11 +160,93 @@
|
||||||
|
|
||||||
Work out the steps to release the most pressure in 30 minutes. What is the most pressure you can release?
|
Work out the steps to release the most pressure in 30 minutes. What is the most pressure you can release?
|
||||||
|
|
||||||
To begin, get your puzzle input.
|
Your puzzle answer was 1862.
|
||||||
|
|
||||||
Answer: _____________________ [ [Submit] ]
|
--- Part Two ---
|
||||||
|
|
||||||
You can also [Shareon Twitter Mastodon] this puzzle.
|
You're worried that even with an optimal approach, the pressure released won't be enough. What if you got one of the elephants to help you?
|
||||||
|
|
||||||
|
It would take you 4 minutes to teach an elephant how to open the right valves in the right order, leaving you with only 26 minutes to actually execute
|
||||||
|
your plan. Would having two of you working together be better, even if it means having less time? (Assume that you teach the elephant before opening any
|
||||||
|
valves yourself, giving you both the same full 26 minutes.)
|
||||||
|
|
||||||
|
In the example above, you could teach the elephant to help you as follows:
|
||||||
|
|
||||||
|
== Minute 1 ==
|
||||||
|
No valves are open.
|
||||||
|
You move to valve II.
|
||||||
|
The elephant moves to valve DD.
|
||||||
|
|
||||||
|
== Minute 2 ==
|
||||||
|
No valves are open.
|
||||||
|
You move to valve JJ.
|
||||||
|
The elephant opens valve DD.
|
||||||
|
|
||||||
|
== Minute 3 ==
|
||||||
|
Valve DD is open, releasing 20 pressure.
|
||||||
|
You open valve JJ.
|
||||||
|
The elephant moves to valve EE.
|
||||||
|
|
||||||
|
== Minute 4 ==
|
||||||
|
Valves DD and JJ are open, releasing 41 pressure.
|
||||||
|
You move to valve II.
|
||||||
|
The elephant moves to valve FF.
|
||||||
|
|
||||||
|
== Minute 5 ==
|
||||||
|
Valves DD and JJ are open, releasing 41 pressure.
|
||||||
|
You move to valve AA.
|
||||||
|
The elephant moves to valve GG.
|
||||||
|
|
||||||
|
== Minute 6 ==
|
||||||
|
Valves DD and JJ are open, releasing 41 pressure.
|
||||||
|
You move to valve BB.
|
||||||
|
The elephant moves to valve HH.
|
||||||
|
|
||||||
|
== Minute 7 ==
|
||||||
|
Valves DD and JJ are open, releasing 41 pressure.
|
||||||
|
You open valve BB.
|
||||||
|
The elephant opens valve HH.
|
||||||
|
|
||||||
|
== Minute 8 ==
|
||||||
|
Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
|
||||||
|
You move to valve CC.
|
||||||
|
The elephant moves to valve GG.
|
||||||
|
|
||||||
|
== Minute 9 ==
|
||||||
|
Valves BB, DD, HH, and JJ are open, releasing 76 pressure.
|
||||||
|
You open valve CC.
|
||||||
|
The elephant moves to valve FF.
|
||||||
|
|
||||||
|
== Minute 10 ==
|
||||||
|
Valves BB, CC, DD, HH, and JJ are open, releasing 78 pressure.
|
||||||
|
The elephant moves to valve EE.
|
||||||
|
|
||||||
|
== Minute 11 ==
|
||||||
|
Valves BB, CC, DD, HH, and JJ are open, releasing 78 pressure.
|
||||||
|
The elephant opens valve EE.
|
||||||
|
|
||||||
|
(At this point, all valves are open.)
|
||||||
|
|
||||||
|
== Minute 12 ==
|
||||||
|
Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
|
||||||
|
|
||||||
|
...
|
||||||
|
|
||||||
|
== Minute 20 ==
|
||||||
|
Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
|
||||||
|
|
||||||
|
...
|
||||||
|
|
||||||
|
== Minute 26 ==
|
||||||
|
Valves BB, CC, DD, EE, HH, and JJ are open, releasing 81 pressure.
|
||||||
|
|
||||||
|
With the elephant helping, after 26 minutes, the best you could do would release a total of 1707 pressure.
|
||||||
|
|
||||||
|
With you and an elephant working together for 26 minutes, what is the most pressure you could release?
|
||||||
|
|
||||||
|
Your puzzle answer was 2422.
|
||||||
|
|
||||||
|
Both parts of this puzzle are complete! They provide two gold stars: **
|
||||||
|
|
||||||
References
|
References
|
||||||
|
|
||||||
|
|
@ -196,7 +254,6 @@ References
|
||||||
. https://adventofcode.com/
|
. https://adventofcode.com/
|
||||||
. https://adventofcode.com/2022/about
|
. https://adventofcode.com/2022/about
|
||||||
. https://adventofcode.com/2022/events
|
. https://adventofcode.com/2022/events
|
||||||
. https://teespring.com/stores/advent-of-code
|
|
||||||
. https://adventofcode.com/2022/settings
|
. https://adventofcode.com/2022/settings
|
||||||
. https://adventofcode.com/2022/auth/logout
|
. https://adventofcode.com/2022/auth/logout
|
||||||
. Advent of Code Supporter
|
. Advent of Code Supporter
|
||||||
|
|
@ -208,7 +265,5 @@ References
|
||||||
. https://adventofcode.com/2022/leaderboard
|
. https://adventofcode.com/2022/leaderboard
|
||||||
. https://adventofcode.com/2022/stats
|
. https://adventofcode.com/2022/stats
|
||||||
. https://adventofcode.com/2022/sponsors
|
. https://adventofcode.com/2022/sponsors
|
||||||
. https://sentry.io/
|
. https://adventofcode.com/2022
|
||||||
. https://adventofcode.com/2022/day/16/input
|
. https://adventofcode.com/2022/day/16/input
|
||||||
. https://twitter.com/intent/tweet?text=%22Proboscidea+Volcanium%22+%2D+Day+16+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F16&related=ericwastl&hashtags=AdventOfCode
|
|
||||||
. javascript:void(0);
|
|
||||||
|
|
|
||||||
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Reference in New Issue