Combine AoC Repos
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227
2015/day22/main.go
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227
2015/day22/main.go
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package main
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import (
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"fmt"
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"os"
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"strconv"
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)
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const (
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playerTurn = iota
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bossTurn
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)
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type state struct {
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bossHp int
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bossDmg int
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playerHp int
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playerMp int
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playerDef int
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shield int
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poison int
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recharge int
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manaSpent int
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move int
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}
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type spell struct {
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name string
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mpCost int
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damage int
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heal int
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duration int
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}
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var minMp int
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var spellBook []spell
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var stateStack []state
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func main() {
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minMp = -1
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initSpellBook()
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if len(os.Args) == 2 && os.Args[1] == "-help" {
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fmt.Println("Usage: day22 [<boss hp> <boss dmg> [<player hp> <player mp>]]")
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os.Exit(1)
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}
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//debugMode = true
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eHp := 71
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eDmg := 10
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if len(os.Args) >= 3 {
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eHp = mustAtoi(os.Args[1])
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eDmg = mustAtoi(os.Args[2])
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}
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pHp := 50
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pMp := 500
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if len(os.Args) == 5 {
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pHp = mustAtoi(os.Args[3])
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pMp = mustAtoi(os.Args[4])
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}
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s := state{
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bossHp: eHp,
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bossDmg: eDmg,
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playerHp: pHp,
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playerMp: pMp,
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playerDef: 0,
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shield: 0,
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poison: 0,
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recharge: 0,
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manaSpent: 0,
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move: playerTurn,
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}
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stateStack = append(stateStack, s)
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for len(stateStack) > 0 {
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var wrk state
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wrk, stateStack = stateStack[0], stateStack[1:]
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// Hard Mode
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if wrk.move == playerTurn {
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wrk.playerHp--
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}
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wrk.playerDef = 0
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if wrk.shield > 0 {
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wrk.playerDef = 7
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}
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if wrk.poison > 0 {
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wrk.bossHp -= 3
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}
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if wrk.recharge > 0 {
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wrk.playerMp += 101
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}
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wrk = decrementTimers(wrk)
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if wrk.playerHp <= 0 || (wrk.manaSpent > minMp && minMp != -1) {
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// Unsuccessful path
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continue
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}
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if wrk.bossHp <= 0 {
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// Successful path!
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if minMp == -1 || minMp > wrk.manaSpent {
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minMp = wrk.manaSpent
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}
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continue
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}
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if wrk.move == bossTurn {
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wrk.move = playerTurn
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atk := 1
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if wrk.bossDmg-wrk.playerDef > 1 {
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atk = wrk.bossDmg - wrk.playerDef
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}
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wrk.playerHp -= atk
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stateStack = append([]state{wrk}, stateStack...)
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} else {
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wrk.move = bossTurn
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for i := range spellBook {
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tstSpell := spellBook[i]
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if tstSpell.mpCost >= wrk.playerMp {
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continue
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}
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nextState, ok := castSpell(wrk, tstSpell)
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if ok {
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stateStack = append([]state{nextState}, stateStack...)
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}
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}
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}
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}
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fmt.Printf("%d\n", minMp)
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}
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func castSpell(w state, s spell) (state, bool) {
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if s.name == "Magic Missile" || s.name == "Drain" {
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w.bossHp -= s.damage
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w.playerHp += s.heal
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} else if s.name == "Shield" {
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if w.shield > 0 {
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return w, false
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}
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w.shield = s.duration
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} else if s.name == "Poison" {
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if w.poison > 0 {
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return w, false
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}
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w.poison = s.duration
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} else if s.name == "Recharge" {
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if w.recharge > 0 {
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return w, false
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}
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w.recharge = s.duration
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}
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w.playerMp -= s.mpCost
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w.manaSpent += s.mpCost
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return w, true
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}
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func copyState(w state) state {
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ret := state{
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bossHp: w.bossHp,
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bossDmg: w.bossDmg,
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playerHp: w.playerHp,
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playerMp: w.playerMp,
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playerDef: w.playerDef,
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shield: w.shield,
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poison: w.poison,
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recharge: w.recharge,
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manaSpent: w.manaSpent,
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move: w.move,
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}
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return ret
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}
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func printState(w state) {
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if w.move == playerTurn {
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fmt.Println("*** Player Turn ***")
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} else {
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fmt.Println("*** Boss Turn ***")
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}
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fmt.Printf("Player - HP(%d) MP(%d)\n", w.playerHp, w.playerMp)
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fmt.Printf("Boss - HP(%d) DMG(%d)\n", w.bossHp, w.bossDmg)
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fmt.Printf("Shield(%d); Poison(%d); Recharge(%d)\n", w.shield, w.poison, w.recharge)
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fmt.Printf("Mana Used: %d\n", w.manaSpent)
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fmt.Println()
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}
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func decrementTimers(w state) state {
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w.shield--
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w.poison--
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w.recharge--
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return w
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}
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func initSpellBook() {
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spellBook = append(spellBook, spell{
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name: "Magic Missile",
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mpCost: 53,
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damage: 4,
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})
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spellBook = append(spellBook, spell{
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name: "Drain",
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mpCost: 73,
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damage: 2,
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heal: 2,
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})
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spellBook = append(spellBook, spell{
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name: "Shield",
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mpCost: 113,
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duration: 6,
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})
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spellBook = append(spellBook, spell{
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name: "Poison",
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mpCost: 173,
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duration: 6,
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})
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spellBook = append(spellBook, spell{
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name: "Recharge",
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mpCost: 229,
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duration: 5,
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})
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}
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func itoa(i int) string {
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return strconv.Itoa(i)
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}
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func mustAtoi(s string) int {
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var i int
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var err error
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if i, err = strconv.Atoi(s); err != nil {
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fmt.Println("Tried to atoi " + s)
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os.Exit(1)
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}
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return i
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}
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161
2015/day22/problem
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161
2015/day22/problem
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@@ -0,0 +1,161 @@
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Advent of Code
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br0xen 44*
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• [About]
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• [Stats]
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• [Leaderboard]
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• [Settings]
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• [Log out]
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--- Day 22: Wizard Simulator 20XX ---
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Little Henry Case decides that defeating bosses with swords and stuff is boring. Now he's
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playing the game with a wizard. Of course, he gets stuck on another boss and needs your help
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again.
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In this version, combat still proceeds with the player and the boss taking alternating turns.
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The player still goes first. Now, however, you don't get any equipment; instead, you must
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choose one of your spells to cast. The first character at or below 0 hit points loses.
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Since you're a wizard, you don't get to wear armor, and you can't attack normally. However,
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since you do magic damage, your opponent's armor is ignored, and so the boss effectively has
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zero armor as well. As before, if armor (from a spell, in this case) would reduce damage below
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1, it becomes 1 instead - that is, the boss' attacks always deal at least 1 damage.
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On each of your turns, you must select one of your spells to cast. If you cannot afford to
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cast any spell, you lose. Spells cost mana; you start with 500 mana, but have no maximum
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limit. You must have enough mana to cast a spell, and its cost is immediately deducted when
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you cast it. Your spells are Magic Missile, Drain, Shield, Poison, and Recharge.
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• Magic Missile costs 53 mana. It instantly does 4 damage.
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• Drain costs 73 mana. It instantly does 2 damage and heals you for 2 hit points.
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• Shield costs 113 mana. It starts an effect that lasts for 6 turns. While it is active,
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your armor is increased by 7.
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• Poison costs 173 mana. It starts an effect that lasts for 6 turns. At the start of each
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turn while it is active, it deals the boss 3 damage.
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• Recharge costs 229 mana. It starts an effect that lasts for 5 turns. At the start of each
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turn while it is active, it gives you 101 new mana.
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Effects all work the same way. Effects apply at the start of both the player's turns and the
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boss' turns. Effects are created with a timer (the number of turns they last); at the start of
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each turn, after they apply any effect they have, their timer is decreased by one. If this
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decreases the timer to zero, the effect ends. You cannot cast a spell that would start an
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effect which is already active. However, effects can be started on the same turn they end.
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For example, suppose the player has 10 hit points and 250 mana, and that the boss has 13 hit
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points and 8 damage:
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-- Player turn --
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- Player has 10 hit points, 0 armor, 250 mana
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- Boss has 13 hit points
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Player casts Poison.
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-- Boss turn --
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- Player has 10 hit points, 0 armor, 77 mana
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- Boss has 13 hit points
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Poison deals 3 damage; its timer is now 5.
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Boss attacks for 8 damage.
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-- Player turn --
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- Player has 2 hit points, 0 armor, 77 mana
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- Boss has 10 hit points
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Poison deals 3 damage; its timer is now 4.
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Player casts Magic Missile, dealing 4 damage.
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-- Boss turn --
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- Player has 2 hit points, 0 armor, 24 mana
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- Boss has 3 hit points
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Poison deals 3 damage. This kills the boss, and the player wins.
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Now, suppose the same initial conditions, except that the boss has 14 hit points instead:
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-- Player turn --
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- Player has 10 hit points, 0 armor, 250 mana
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- Boss has 14 hit points
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Player casts Recharge.
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-- Boss turn --
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- Player has 10 hit points, 0 armor, 21 mana
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- Boss has 14 hit points
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Recharge provides 101 mana; its timer is now 4.
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Boss attacks for 8 damage!
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-- Player turn --
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- Player has 2 hit points, 0 armor, 122 mana
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- Boss has 14 hit points
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Recharge provides 101 mana; its timer is now 3.
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Player casts Shield, increasing armor by 7.
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-- Boss turn --
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- Player has 2 hit points, 7 armor, 110 mana
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- Boss has 14 hit points
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Shield's timer is now 5.
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Recharge provides 101 mana; its timer is now 2.
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Boss attacks for 8 - 7 = 1 damage!
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-- Player turn --
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- Player has 1 hit point, 7 armor, 211 mana
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- Boss has 14 hit points
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Shield's timer is now 4.
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Recharge provides 101 mana; its timer is now 1.
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Player casts Drain, dealing 2 damage, and healing 2 hit points.
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-- Boss turn --
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- Player has 3 hit points, 7 armor, 239 mana
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- Boss has 12 hit points
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Shield's timer is now 3.
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Recharge provides 101 mana; its timer is now 0.
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Recharge wears off.
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Boss attacks for 8 - 7 = 1 damage!
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-- Player turn --
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- Player has 2 hit points, 7 armor, 340 mana
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- Boss has 12 hit points
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Shield's timer is now 2.
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Player casts Poison.
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-- Boss turn --
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- Player has 2 hit points, 7 armor, 167 mana
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- Boss has 12 hit points
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Shield's timer is now 1.
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Poison deals 3 damage; its timer is now 5.
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Boss attacks for 8 - 7 = 1 damage!
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-- Player turn --
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- Player has 1 hit point, 7 armor, 167 mana
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- Boss has 9 hit points
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Shield's timer is now 0.
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Shield wears off, decreasing armor by 7.
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Poison deals 3 damage; its timer is now 4.
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Player casts Magic Missile, dealing 4 damage.
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-- Boss turn --
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- Player has 1 hit point, 0 armor, 114 mana
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- Boss has 2 hit points
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Poison deals 3 damage. This kills the boss, and the player wins.
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You start with 50 hit points and 500 mana points. The boss's actual stats are in your puzzle
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input. What is the least amount of mana you can spend and still win the fight? (Do not include
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mana recharge effects as "spending" negative mana.)
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To begin, get your puzzle input.
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Answer: _____________________ [ [Submit] ]
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You can also [Shareon Twitter Google+ Reddit] this puzzle.
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References
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Visible links
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. http://adventofcode.com/
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. http://adventofcode.com/about
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. http://adventofcode.com/stats
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. http://adventofcode.com/leaderboard
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. http://adventofcode.com/settings
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. http://adventofcode.com/auth/logout
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. http://adventofcode.com/day/21
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. http://adventofcode.com/day/22/input
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. https://twitter.com/intent/tweet?text=%22Wizard+Simulator+20XX%22+%2D+Day+22+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F22&related=ericwastl&hashtags=AdventOfCode
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. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F22
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. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F22&title=%22Wizard+Simulator+20XX%22+%2D+Day+22+%2D+Advent+of+Code
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