2018 Day 19 part 1 complete

2018/day15/day15.go

@@ -20,8 +20,8 @@ var charSlice []*complex64
 var turnCount int
 
 const (
-	ClearScreen = "\033[H\033[2J"
-	MaxInt      = int(^uint(0) >> 1)
+	CLEAR_SCREEN = "\033[H\033[2J"
+	MAX_INT      = int(^uint(0) >> 1)
 
 	DIR_N = -1i
 	DIR_E = 1
@@ -38,6 +38,7 @@ func main() {
 
 func part1() {
 	for {
+		// Sort the players on the field
 		charSlice = charSlice[0:0]
 		for i := 0; i < len(input); i++ {
 			pos := getPosFromInt(i)
@@ -47,8 +48,8 @@ func part1() {
 			}
 		}
 		sort.Sort(ByPos(charSlice))
-		fmt.Printf("= Turn %d =\n", turnCount)
-		printBattlefield()
+
+		// Tick every player
 		for _, v := range charSlice {
 			if char, ok := characters[*v]; ok {
 				if !char.tick() {
@@ -56,11 +57,11 @@ func part1() {
 				}
 			}
 		}
-
-		if false {
+		if true {
 			time.Sleep(time.Millisecond * 250)
+			printBattlefield()
+			fmt.Println()
 		}
-		printBattlefield()
 		if checkBattleOver() {
 			break
 		}
@@ -110,95 +111,63 @@ func (c *Character) hasEnemies() bool {
 }
 
 func (c *Character) tick() bool {
-	// If we're already in range of a target, don't look for a new one
-	if tPos, err := c.easiestAdjacentTarget(); err == nil {
-		c.attack(tPos)
-		return c.hasEnemies()
+	// Check if this character has any enemies on the field
+	if !c.hasEnemies() {
+		fmt.Println(c.string(), "is unopposed")
+		return false
 	}
-	// If we have no open sides, we can't more
-	if !c.hasOpenFlank() {
-		fmt.Println(c.string(), "blocked in")
-		return true
-	}
-	// Otherwise, find a target
-	var opportunities []complex64
-	for _, oppPos := range charSlice {
-		if v, ok := characters[*oppPos]; ok {
-			if v.tp != c.tp {
-				opportunities = append(opportunities, *oppPos)
-			}
+	// Now move/attack
+	if _, err := c.easiestAdjacentTarget(); err != nil {
+		// Ok, figure out a move
+		nxt, tgt := c.findMove()
+		if nxt != nil {
+			fmt.Println(c.string(), "is moving to", *nxt, "(", *tgt, ")")
+			c.moveTo(*nxt)
 		}
 	}
-	/*
-		var opportunities []complex64
-		for _, oppPos := range charSlice {
-			if v, ok := characters[*oppPos]; ok {
-				if v.tp != c.tp {
-					fmt.Println(c.string(), "checking:", v.string())
-					opportunities = append(opportunities, v.getOpenSides()...)
-				}
-			}
-		}
-		closestDistance := MaxInt
-		var closestPos complex64
-		for _, v := range opportunities {
-			if distance(c.pos, v) < closestDistance {
-				closestDistance = distance(c.pos, v)
-				closestPos = v
-			}
-		}
-	*/
-	// If there are no opportunities, we're done
-	if len(opportunities) == 0 {
-		fmt.Println(c.string(), "sees no opportunities")
-		return true
-	}
-	var bestOpportunities []*complex64
-	moves := make(map[complex64]complex64)
-	bestDist := MaxInt
-	for _, opp := range opportunities {
-		paths := append([]pathPoint{}, pathPoint{
-			pos:   opp,
-			count: 0,
-		})
-		move, length := findMove(c.pos, paths)
-		if length < bestDist {
-			bestOpportunities = append([]*complex64{}, &opp)
-			for k := range moves {
-				delete(moves, k)
-			}
-			moves[opp] = move
-			bestDist = length
-		} else if length == bestDist {
-			bestOpportunities = append(bestOpportunities, &opp)
-			moves[opp] = move
-		}
-	}
-	sort.Sort(ByPos(bestOpportunities))
-	//paths := append([]pathPoint{}, pathPoint{
-	//	pos:   closestPos,
-	//	count: 0,
-	//})
-	//move := findMove(c.pos, paths)
-	if len(bestOpportunities) > 0 {
-		goWith := bestOpportunities[0]
-		fmt.Println(c.string(),
-			"moving to",
-			getCoordString(moves[*goWith]),
-			"(->",
-			getCoordString(*goWith),
-			bestDist, ")")
-		c.moveTo(*goWith)
-	} else {
-		fmt.Println(c.string(), "can't find a path")
-	}
-	// After moving, check for an attack
 	if tPos, err := c.easiestAdjacentTarget(); err == nil {
 		c.attack(tPos)
 	}
 	return c.hasEnemies()
 }
 
+// findMove returns the position this character should move to and the position
+// that is it's ultimate target
+func (c *Character) findMove() (*complex64, *complex64) {
+	var opps []*complex64
+	closestTargetDistance := MAX_INT
+	dist, path := findAllPaths(&c.pos)
+
+	for _, v := range characters {
+		if v.health <= 0 {
+			continue
+		}
+		if v.tp != c.tp {
+			for _, t := range v.getOpenSides() {
+				if d, ok := dist[t]; ok && d <= closestTargetDistance {
+					if d < closestTargetDistance {
+						closestTargetDistance = d
+						opps = []*complex64{}
+					}
+					opps = append(opps, &t)
+				}
+			}
+		}
+		sort.Sort(ByPos(opps))
+		if len(opps) > 0 {
+			t := opps[0]
+			curr := *t
+			for {
+				if pv == c.pos {
+					return &curr, t
+				}
+				curr = pv
+			}
+		}
+	}
+	return nil, nil
+}
+
 func (c *Character) string() string {
 	return fmt.Sprintf("[%s%s:%d]", string(c.tp), getCoordString(c.pos), c.health)
 }
@@ -263,18 +232,6 @@ func (c *Character) hasOpenFlank() bool {
 	return false
 }
 
-func (c *Character) move(dir complex64) bool {
-	if getByte(c.pos+dir) != '.' {
-		return false
-	}
-	delete(characters, c.pos)
-	setByte(c.pos, '.')
-	c.pos += dir
-	characters[c.pos] = c
-	setByte(c.pos, c.tp)
-	return true
-}
-
 func (c *Character) moveTo(pos complex64) bool {
 	if getByte(pos) != '.' {
 		return false
@@ -287,8 +244,39 @@ func (c *Character) moveTo(pos complex64) bool {
 	return true
 }
 
+func getOpenSides(c complex64) []complex64 {
+	var ret []complex64
+	for _, d := range []complex64{DIR_N, DIR_E, DIR_S, DIR_W} {
+		if getByte(c+d) == '.' {
+			ret = append(ret, c+d)
+		}
+	}
+	return ret
+}
+
+// findAllPaths returns a map of all distances and a map of all paths
+func findAllPaths(start *complex64) (map[complex64]int, map[complex64]complex64) {
+	all := []complex64{*start}
+	dist := map[complex64]int{*start: 0}
+	prev := map[complex64]complex64{*start: 0}
+
+	for len(all) > 0 {
+		c := all[0]
+		all = all[1:]
+		for _, n := range getOpenSides(c) {
+			if _, ok := dist[n]; !ok {
+				all = append(all, n)
+				dist[n] = dist[c] + 1
+				prev[n] = c
+			}
+		}
+	}
+
+	return dist, prev
+}
+
 func printBattlefield() {
-	//fmt.Print(ClearScreen)
+	//fmt.Print(CLEAR_SCREEN)
 	for i := 0; i < len(input)/width; i++ {
 		fmt.Println(string(input[i*width : (i+1)*width]))
 	}
@@ -357,7 +345,7 @@ func findMove(p1 complex64, paths []pathPoint) (complex64, int) {
 	// First check if p1 has _any_ possible moves
 	lowest := pathPoint{
 		pos:   0 - 1i,
-		count: MaxInt,
+		count: MAX_INT,
 	}
 	for _, v := range paths {
 		for _, d := range []complex64{DIR_N, DIR_E, DIR_S, DIR_W} {
@@ -390,7 +378,7 @@ func findMove(p1 complex64, paths []pathPoint) (complex64, int) {
 			paths = append(paths, wrkPt)
 		}
 	}
-	if len(paths) != pathCount && lowest.count == MaxInt {
+	if len(paths) != pathCount && lowest.count == MAX_INT {
 		return findMove(p1, paths)
 	}
 	// We hit the end, return the lowest part

2018/day19/day19.go

@@ -0,0 +1,197 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	input := stdinToStringSlice()
+	part1(input)
+}
+
+func part1(input []string) {
+	vpc := NewState()
+	vpc.reg[0] = 1
+	if strings.HasPrefix(input[0], "#ip") {
+		// Binding the ip to a register...
+		pts := strings.Split(input[0], " ")
+		vpc.ipReg = Atoi(pts[1])
+		input = input[1:]
+	}
+	for i := 0; i < 1000000; i++ {
+		if vpc.ip >= len(input) {
+			break
+		}
+		inp := input[vpc.ip]
+		if op, cmd, err := vpc.parseCommand(inp); err == nil {
+			if vpc.ipReg > -1 {
+				vpc.reg[vpc.ipReg] = vpc.ip
+			}
+			vpc.run(op, cmd)
+			vpc.ip = vpc.reg[vpc.ipReg]
+		}
+		vpc.ip++
+	}
+	fmt.Println(vpc.string())
+}
+
+type State struct {
+	ip, ipReg int
+	reg       [6]int
+	OpCodes   map[string]func(a, b, c int)
+}
+
+func NewState() *State {
+	s := &State{
+		ip:    0,
+		ipReg: -1,
+	}
+	s.OpCodes = make(map[string]func(a, b, c int))
+	s.OpCodes["addr"] = s.addr
+	s.OpCodes["addi"] = s.addi
+	s.OpCodes["mulr"] = s.mulr
+	s.OpCodes["muli"] = s.muli
+	s.OpCodes["banr"] = s.banr
+	s.OpCodes["bani"] = s.bani
+	s.OpCodes["borr"] = s.borr
+	s.OpCodes["bori"] = s.bori
+	s.OpCodes["setr"] = s.setr
+	s.OpCodes["seti"] = s.seti
+	s.OpCodes["gtir"] = s.gtir
+	s.OpCodes["gtri"] = s.gtri
+	s.OpCodes["gtrr"] = s.gtrr
+	s.OpCodes["eqir"] = s.eqir
+	s.OpCodes["eqri"] = s.eqri
+	s.OpCodes["eqrr"] = s.eqrr
+	return s
+}
+
+func (s *State) parseCommand(inp string) (string, []int, error) {
+	var retOp string
+	var retCmd []int
+	pts := strings.Split(inp, " ")
+	if len(pts) != 4 {
+		return retOp, retCmd, errors.New("Invalid Command")
+	}
+	retOp = pts[0]
+	for _, v := range pts[1:] {
+		retCmd = append(retCmd, Atoi(v))
+	}
+	return retOp, retCmd, nil
+}
+
+func (s *State) string() string {
+	ret := fmt.Sprintf("ip=%d ", s.ip)
+	for i := 0; i < len(s.reg); i++ {
+		if i == s.ipReg {
+			ret = fmt.Sprintf("%s <%d> ", ret, s.reg[i])
+		} else {
+			ret = fmt.Sprintf("%s %d ", ret, s.reg[i])
+		}
+	}
+	return ret
+}
+
+func (s *State) run(op string, cmd []int) error {
+	if fn, ok := s.OpCodes[op]; !ok {
+		return errors.New(fmt.Sprintf("Invalid OpCode: %d", cmd[0]))
+	} else {
+		fn(cmd[0], cmd[1], cmd[2])
+	}
+	return nil
+}
+
+func (s *State) addr(r1, r2, r3 int) {
+	s.reg[r3] = s.reg[r1] + s.reg[r2]
+}
+
+func (s *State) addi(r1, v2, r3 int) {
+	s.reg[r3] = s.reg[r1] + v2
+}
+
+func (s *State) mulr(r1, r2, r3 int) {
+	s.reg[r3] = s.reg[r1] * s.reg[r2]
+}
+
+func (s *State) muli(r1, v2, r3 int) {
+	s.reg[r3] = s.reg[r1] * v2
+}
+
+func (s *State) banr(r1, r2, r3 int) {
+	s.reg[r3] = s.reg[r1] & s.reg[r2]
+}
+
+func (s *State) bani(r1, v2, r3 int) {
+	s.reg[r3] = s.reg[r1] & v2
+}
+
+func (s *State) borr(r1, r2, r3 int) {
+	s.reg[r3] = s.reg[r1] | s.reg[r2]
+}
+
+func (s *State) bori(r1, v2, r3 int) {
+	s.reg[r3] = s.reg[r1] | v2
+}
+
+func (s *State) setr(r1, r2, r3 int) {
+	s.reg[r3] = s.reg[r1]
+}
+
+func (s *State) seti(v1, v2, r3 int) {
+	s.reg[r3] = v1
+}
+
+func (s *State) gtir(v1, r2, r3 int) {
+	s.reg[r3] = boolToInt(v1 > s.reg[r2])
+}
+
+func (s *State) gtri(r1, v2, r3 int) {
+	s.reg[r3] = boolToInt(s.reg[r1] > v2)
+}
+
+func (s *State) gtrr(r1, r2, r3 int) {
+	s.reg[r3] = boolToInt(s.reg[r1] > s.reg[r2])
+}
+
+func (s *State) eqir(v1, r2, r3 int) {
+	s.reg[r3] = boolToInt(v1 == s.reg[r2])
+}
+
+func (s *State) eqri(r1, v2, r3 int) {
+	s.reg[r3] = boolToInt(s.reg[r1] == v2)
+}
+
+func (s *State) eqrr(r1, r2, r3 int) {
+	s.reg[r3] = boolToInt(s.reg[r1] == s.reg[r2])
+}
+
+func boolToInt(v bool) int {
+	if v {
+		return 1
+	}
+	return 0
+}
+
+func stdinToStringSlice() []string {
+	var input []string
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		input = append(input, scanner.Text())
+	}
+	return input
+}
+
+func Atoi(i string) int {
+	var ret int
+	var err error
+	if ret, err = strconv.Atoi(i); err != nil {
+		log.Fatal("Invalid Atoi: " + i)
+	}
+	return ret
+}

2018/day19/input

@@ -0,0 +1,37 @@
+#ip 4
+addi 4 16 4
+seti 1 4 3
+seti 1 3 5
+mulr 3 5 1
+eqrr 1 2 1
+addr 1 4 4
+addi 4 1 4
+addr 3 0 0
+addi 5 1 5
+gtrr 5 2 1
+addr 4 1 4
+seti 2 9 4
+addi 3 1 3
+gtrr 3 2 1
+addr 1 4 4
+seti 1 6 4
+mulr 4 4 4
+addi 2 2 2
+mulr 2 2 2
+mulr 4 2 2
+muli 2 11 2
+addi 1 2 1
+mulr 1 4 1
+addi 1 7 1
+addr 2 1 2
+addr 4 0 4
+seti 0 8 4
+setr 4 3 1
+mulr 1 4 1
+addr 4 1 1
+mulr 4 1 1
+muli 1 14 1
+mulr 1 4 1
+addr 2 1 2
+seti 0 3 0
+seti 0 6 4

2018/day19/testinput

@@ -0,0 +1,8 @@
+#ip 0
+seti 5 0 1
+seti 6 0 2
+addi 0 1 0
+addr 1 2 3
+setr 1 0 0
+seti 8 0 4
+seti 9 0 5