new idea for d19p2 actually works

2015 finished!

day19/day.go

@@ -1,6 +1,8 @@
 package day19
 
 import (
+	"fmt"
+	"os"
 	"strings"
 	"tools"
 )
@@ -42,63 +44,57 @@ func Part1(puzzle tools.AoCPuzzle) interface{} {
 	return len(outcomes)
 }
 
-func getPossibleTransformations(from tools.Set, replacments map[string]tools.Set, maxLen int) tools.Set {
-	returnSet := tools.NewSet()
-	var result string
-
-	for interfaceMolecule := range from {
-		currentMolecule := interfaceMolecule.(string)
-		for i := range currentMolecule {
-			if transSet, ok := replacments[string(currentMolecule[i])]; ok {
-				for replacement := range transSet {
-					result = currentMolecule[:i] + replacement.(string)
-					if i < len(currentMolecule)-1 {
-						result += currentMolecule[i+1:]
-					}
-					if len(result) <= maxLen {
-						returnSet.Add(result)
-					}
-				}
-			}
-			if i < len(currentMolecule)-1 {
-				if transSet, ok := replacments[currentMolecule[i:i+2]]; ok {
-					for replacment := range transSet {
-						result = currentMolecule[:i] + replacment.(string)
-						if i < len(currentMolecule)-2 {
-							result += currentMolecule[i+2:]
-						}
-						if len(result) <= maxLen {
-							returnSet.Add(result)
-						}
-					}
-				}
-			}
-		}
-	}
-
-	return returnSet
-}
-
 func Part2(puzzle tools.AoCPuzzle) interface{} {
 	input := puzzle.GetInputArray()
 	molecule := input[len(input)-1]
 	replacementStrings := input[:len(input)-2]
-	replacements := make(map[string]tools.Set)
-	for _, line := range replacementStrings {
-		parts := strings.Split(line, " => ")
-		if _, ok := replacements[parts[0]]; !ok {
-			replacements[parts[0]] = tools.NewSet()
+
+	replacements := make(map[string]string)
+	replacementLengths := make(map[int][]string)
+	var maxLen, minLen int
+	for _, s := range replacementStrings {
+		parts := strings.Split(s, " => ")
+		if _, ok := replacements[parts[1]]; ok {
+			fmt.Println("Double target string found!")
+			os.Exit(1)
+		} else {
+			replacements[parts[1]] = parts[0]
+			x := len(parts[1])
+			if x > maxLen {
+				maxLen = x
+			}
+			if x < minLen {
+				minLen = x
+			}
+			if _, ok := replacementLengths[x]; ok {
+				replacementLengths[x] = append(replacementLengths[x], parts[1])
+			} else {
+				replacementLengths[x] = []string{parts[1]}
+			}
 		}
-		replacements[parts[0]].Add(parts[1])
 	}
 
-	currentMolecules := tools.NewSet()
-	currentMolecules.Add("e")
-	transformCount := 0
-	for !currentMolecules.Contains(molecule) {
-		transformCount++
-		currentMolecules = getPossibleTransformations(currentMolecules, replacements, len(molecule))
+	steps := 0
+	foundSomething := false
+	for len(molecule) > 1 {
+		foundSomething = false
+		for x := maxLen; x >= minLen; x-- {
+			for _, replacement := range replacementLengths[x] {
+				if strings.Contains(molecule, replacement) {
+					molecule = strings.Replace(molecule, replacement, replacements[replacement], 1)
+					foundSomething = true
+					steps++
+					break
+				}
+			}
+			if foundSomething {
+				break
+			}
+		}
+		if !foundSomething {
+			break
+		}
 	}
 
-	return transformCount
+	return steps
 }

day22/day.go

@@ -0,0 +1,216 @@
+package day22
+
+import (
+	"math"
+	"strconv"
+	"strings"
+	"tools"
+)
+
+/*
+Spells:
+	Magic Missile - 53 Mana - 4 Damage
+	Drain - 73 Mana - 2 Damage, 2 Heal
+	Shield - 113 Mana - 7 Armor for 6 turns
+	Poison - 173 Mana - 3 Damage per turn for 6 turns
+	Recharge - 229 Mana - 101 Mana per turn for 5 turns
+*/
+
+type Entity struct {
+	hitpoints int
+	mana      int
+	armor     int
+	damage    int
+}
+
+var spells = map[string]string{
+	"mm": "Magic Missile",
+	"d":  "Drain",
+	"s":  "Shield",
+	"rc": "Recharge",
+	"p":  "Poison",
+}
+var minWinningMana int
+
+func applyEffects(player, boss Entity, effects map[string]int) (Entity, Entity, map[string]int) {
+	for e, t := range effects {
+		t--
+		switch e {
+		case "rc":
+			player.mana += 101
+			// fmt.Println("Recharge provides 101 mana; it's timer is now ", t)
+		case "p":
+			boss.hitpoints -= 3
+			// fmt.Println("Poison deals 3 damage; it's timer is now ", t)
+		case "s":
+			if t == 0 {
+				player.armor -= 7
+			}
+			// fmt.Println("Shield's timer is now ", t)
+		}
+		if t == 0 {
+			// fmt.Println(spells[e], " wears off.")
+			delete(effects, e)
+		} else {
+			effects[e] = t
+		}
+	}
+
+	return player, boss, effects
+}
+
+func turn(player, boss Entity, effects map[string]int, spell string, hardmode bool) (Entity, Entity, map[string]int, int, int) {
+	// return values: -1 player dead; 0 both alive; 1 boss dead
+	/*
+		fmt.Println("-- Player Turn --")
+		fmt.Println("- Player has ", player.hitpoints, "hit points, ", player.armor, " armor, ", player.mana, " mana")
+		fmt.Println("- Boss  has ", boss.hitpoints, " hit points")
+	*/
+	if hardmode {
+		player.hitpoints -= 1
+		if player.hitpoints <= 0 {
+			return player, boss, effects, 0, -1
+		}
+	}
+	// Apply effects, if any
+	player, boss, effects = applyEffects(player, boss, effects)
+	// Player cast spell -- which one?
+	if _, ok := effects[spell]; ok {
+		// cannot cast already active effect; how to fail?
+		// just pretend the player died ...
+		return player, boss, effects, 0, -1
+	}
+	var manaUsed int
+	switch spell {
+	case "mm":
+		// fmt.Println("Player casts Magic Missile; dealing 4 damage.")
+		boss.hitpoints -= 4
+		manaUsed = 53
+	case "d":
+		// fmt.Println("Player casts Drain; dealing 2 damage and healing 2 hit points.")
+		player.hitpoints += 2
+		boss.hitpoints -= 2
+		manaUsed = 73
+	case "p":
+		// fmt.Println("Player casts Poison.")
+		effects[spell] = 6
+		manaUsed = 173
+	case "s":
+		// fmt.Println("Player casts Shield.")
+		player.armor += 7
+		manaUsed = 113
+		effects[spell] = 6
+	case "rc":
+		// fmt.Println("Player casts recharge.")
+		manaUsed = 229
+		effects[spell] = 5
+	}
+	player.mana -= manaUsed
+	if player.mana <= 0 {
+		return player, boss, effects, manaUsed, -1
+	}
+
+	// Check Boss health
+	if boss.hitpoints <= 0 {
+		return player, boss, effects, manaUsed, 1
+	}
+
+	/*
+		fmt.Println("-- Boss Turn --")
+		fmt.Println("- Player has ", player.hitpoints, "hit points, ", player.armor, " armor, ", player.mana, " mana")
+		fmt.Println("- Boss  has ", boss.hitpoints, " hit points")
+	*/
+	// Apply effects, if any
+	player, boss, effects = applyEffects(player, boss, effects)
+	// Check Boss health
+	if boss.hitpoints <= 0 {
+		return player, boss, effects, manaUsed, 1
+	}
+
+	bossDamage := int(math.Max(1.0, float64(boss.damage-player.armor)))
+	// fmt.Println("Boss attacks for ", bossDamage, " damage.")
+	// Check Player health
+	player.hitpoints -= bossDamage
+	if player.hitpoints <= 0 {
+		return player, boss, effects, manaUsed, -1
+	}
+
+	return player, boss, effects, manaUsed, 0
+}
+
+func findLowestManaUsed(player, boss Entity, effects map[string]int, manaUsed int, spellsUsed string, hardmode bool, depth int) (int, string) {
+	minManaUsed := math.MaxInt32
+	var minSpellsUsed string
+	for s := range spells {
+		var thisManaUse, state int
+		thisPlayer := player
+		thisBoss := boss
+		thisEffects := make(map[string]int)
+		thisSpells := spellsUsed + "," + s
+		for e, t := range effects {
+			thisEffects[e] = t
+		}
+		thisPlayer, thisBoss, thisEffects, thisManaUse, state = turn(thisPlayer, thisBoss, thisEffects, s, hardmode)
+		switch state {
+		case -1:
+			continue
+		case 0:
+			if thisManaUse+manaUsed < minWinningMana {
+				thisManaUse, thisSpells = findLowestManaUsed(thisPlayer, thisBoss, thisEffects, thisManaUse+manaUsed, thisSpells, hardmode, depth+1)
+			} else {
+				continue
+			}
+		case 1:
+			if manaUsed+thisManaUse < minWinningMana {
+				minWinningMana = manaUsed + thisManaUse
+			}
+		}
+		if thisManaUse < minManaUsed {
+			minManaUsed = thisManaUse
+			minSpellsUsed = thisSpells
+		}
+	}
+	return minManaUsed + manaUsed, minSpellsUsed
+}
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	player := Entity{50, 500, 0, 0}
+	boss := Entity{0, 0, 0, 0}
+	bossData := puzzle.GetInputArray()
+	for _, line := range bossData {
+		parts := strings.Split(line, ": ")
+		switch parts[0] {
+		case "Hit Points":
+			boss.hitpoints, _ = strconv.Atoi(parts[1])
+		case "Damage":
+			boss.damage, _ = strconv.Atoi(parts[1])
+		}
+	}
+
+	effects := make(map[string]int)
+	minWinningMana = math.MaxInt32
+
+	findLowestManaUsed(player, boss, effects, 0, "", false, 0)
+	return minWinningMana
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	player := Entity{50, 500, 0, 0}
+	boss := Entity{0, 0, 0, 0}
+	bossData := puzzle.GetInputArray()
+	for _, line := range bossData {
+		parts := strings.Split(line, ": ")
+		switch parts[0] {
+		case "Hit Points":
+			boss.hitpoints, _ = strconv.Atoi(parts[1])
+		case "Damage":
+			boss.damage, _ = strconv.Atoi(parts[1])
+		}
+	}
+
+	effects := make(map[string]int)
+	minWinningMana = math.MaxInt32
+
+	findLowestManaUsed(player, boss, effects, 0, "", true, 0)
+	return minWinningMana
+}

day23/day.go

@@ -0,0 +1,65 @@
+package day23
+
+import (
+	"strconv"
+	"strings"
+	"tools"
+)
+
+func run(code []string, registers map[string]int) {
+	instptr := 0
+
+	for instptr < len(code) {
+		instrparts := strings.Split(code[instptr], " ")
+		switch instrparts[0] {
+		case "hlf": // half a register
+			registers[instrparts[1]] /= 2
+			instptr++
+		case "tpl": // tripple a register
+			registers[instrparts[1]] *= 3
+			instptr++
+		case "inc": // increase register by 1
+			registers[instrparts[1]]++
+			instptr++
+		case "jmp": // jump to instruction
+			jumpamount, _ := strconv.Atoi(instrparts[1])
+			instptr += jumpamount
+		case "jie": // jump to instruction if register is even
+			if registers[string(instrparts[1][0])]%2 == 0 {
+				jumpamount, _ := strconv.Atoi(instrparts[2])
+				instptr += jumpamount
+			} else {
+				instptr++
+			}
+		case "jio": // jump to instruction if register is one
+			if registers[string(instrparts[1][0])] == 1 {
+				jumpamount, _ := strconv.Atoi(instrparts[2])
+				instptr += jumpamount
+			} else {
+				instptr++
+			}
+		}
+	}
+}
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	code := puzzle.GetInputArray()
+	registers := map[string]int{
+		"a": 0,
+		"b": 0,
+	}
+	run(code, registers)
+
+	return registers["b"]
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	code := puzzle.GetInputArray()
+	registers := map[string]int{
+		"a": 1,
+		"b": 0,
+	}
+	run(code, registers)
+
+	return registers["b"]
+}

day24/day.go

@@ -0,0 +1,44 @@
+package day24
+
+import (
+	"math"
+	"tools"
+)
+
+func findMinQE(packageWeights []int, weightPerCompartment int) int {
+	var results [][]int
+	for i := 1; i < len(packageWeights); i++ {
+		for _, comb := range tools.CombinationsInt(packageWeights, i) {
+			if tools.Sum(comb...) == weightPerCompartment {
+				results = append(results, comb)
+			}
+		}
+		if len(results) > 0 {
+			break
+		}
+	}
+
+	minQE := math.MaxInt64
+	for _, result := range results {
+		thisQE := tools.Mul(result...)
+		if thisQE < minQE {
+			minQE = thisQE
+		}
+	}
+
+	return minQE
+}
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	packageWeights := puzzle.GetInputArrayInt()
+	weightPerCompartment := tools.Sum(packageWeights...) / 3
+
+	return findMinQE(packageWeights, weightPerCompartment)
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	packageWeights := puzzle.GetInputArrayInt()
+	weightPerCompartment := tools.Sum(packageWeights...) / 4
+
+	return findMinQE(packageWeights, weightPerCompartment)
+}

day25/day.go

@@ -0,0 +1,36 @@
+package day25
+
+import (
+	"strconv"
+	"strings"
+	"tools"
+)
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	inputParts := strings.Split(puzzle.GetInputArray()[0], " ")
+	wantedX, _ := strconv.Atoi(inputParts[18][:len(inputParts[18])-1])
+	wantedY, _ := strconv.Atoi(inputParts[16][:len(inputParts[16])-1])
+	codeNumber := 20151125
+	x := 1
+	y := 1
+	maxY := 1
+
+	for {
+		codeNumber = codeNumber * 252533 % 33554393
+		y--
+		x++
+		if y == 0 {
+			y = maxY + 1
+			maxY = y
+			x = 1
+		}
+
+		if x == wantedX && y == wantedY {
+			return codeNumber
+		}
+	}
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	return "d25p2 always only checks if you solved everything else"
+}

inputs/22

@@ -0,0 +1,2 @@
+Hit Points: 55
+Damage: 8

inputs/22_test

@@ -0,0 +1,2 @@
+Hit Points: 14
+Damage: 8

inputs/23

@@ -0,0 +1,47 @@
+jio a, +18
+inc a
+tpl a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+jmp +22
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+jio a, +8
+inc b
+jie a, +4
+tpl a
+inc a
+jmp +2
+hlf a
+jmp -7

inputs/23_test

@@ -0,0 +1,4 @@
+inc a
+jio a, +2
+tpl a
+inc a

inputs/24

@@ -0,0 +1,29 @@
+1
+2
+3
+7
+11
+13
+17
+19
+23
+31
+37
+41
+43
+47
+53
+59
+61
+67
+71
+73
+79
+83
+89
+97
+101
+103
+107
+109
+113

inputs/24_test

@@ -0,0 +1,10 @@
+1
+2
+3
+4
+5
+7
+8
+9
+10
+11

inputs/25

@@ -0,0 +1 @@
+To continue, please consult the code grid in the manual.  Enter the code at row 2978, column 3083.

inputs/25_test

@@ -0,0 +1 @@
+To continue, please consult the code grid in the manual.  Enter the code at row 6, column 6.

main.go

@@ -22,6 +22,10 @@ import (
 	"aoc2015/day19"
 	"aoc2015/day20"
 	"aoc2015/day21"
+	"aoc2015/day22"
+	"aoc2015/day23"
+	"aoc2015/day24"
+	"aoc2015/day25"
 	"flag"
 	"fmt"
 	"os"
@@ -60,6 +64,10 @@ func initDayFunctions() {
 		19: {1: day19.Part1, 2: day19.Part2},
 		20: {1: day20.Part1, 2: day20.Part2},
 		21: {1: day21.Part1, 2: day21.Part2},
+		22: {1: day22.Part1, 2: day22.Part2},
+		23: {1: day23.Part1, 2: day23.Part2},
+		24: {1: day24.Part1, 2: day24.Part2},
+		25: {1: day25.Part1, 2: day25.Part2},
 	}
 }