Ugly day 11

11/answers.txt

@@ -0,0 +1,2 @@
+1883
+APUGURFH

11/input.txt

@@ -0,0 +1 @@
+3,8,1005,8,301,1106,0,11,0,0,0,104,1,104,0,3,8,102,-1,8,10,1001,10,1,10,4,10,108,1,8,10,4,10,102,1,8,28,1006,0,98,3,8,102,-1,8,10,101,1,10,10,4,10,1008,8,1,10,4,10,101,0,8,54,2,1001,6,10,1,108,1,10,3,8,1002,8,-1,10,101,1,10,10,4,10,1008,8,0,10,4,10,1002,8,1,84,3,8,102,-1,8,10,1001,10,1,10,4,10,108,1,8,10,4,10,101,0,8,105,1006,0,94,2,7,20,10,2,5,7,10,3,8,1002,8,-1,10,1001,10,1,10,4,10,1008,8,0,10,4,10,102,1,8,139,1006,0,58,2,1003,16,10,1,6,10,10,3,8,1002,8,-1,10,101,1,10,10,4,10,1008,8,0,10,4,10,102,1,8,172,2,107,12,10,3,8,102,-1,8,10,1001,10,1,10,4,10,108,0,8,10,4,10,101,0,8,197,1006,0,34,3,8,102,-1,8,10,101,1,10,10,4,10,1008,8,1,10,4,10,102,1,8,223,1006,0,62,3,8,102,-1,8,10,101,1,10,10,4,10,1008,8,1,10,4,10,1001,8,0,248,1,7,7,10,1006,0,64,2,1008,5,10,3,8,1002,8,-1,10,1001,10,1,10,4,10,108,0,8,10,4,10,102,1,8,280,101,1,9,9,1007,9,997,10,1005,10,15,99,109,623,104,0,104,1,21102,1,387508351636,1,21101,318,0,0,1106,0,422,21102,1,838480007948,1,21101,0,329,0,1106,0,422,3,10,104,0,104,1,3,10,104,0,104,0,3,10,104,0,104,1,3,10,104,0,104,1,3,10,104,0,104,0,3,10,104,0,104,1,21101,0,235190525123,1,21101,0,376,0,1105,1,422,21101,0,106505084123,1,21101,0,387,0,1106,0,422,3,10,104,0,104,0,3,10,104,0,104,0,21101,0,838324605292,1,21102,1,410,0,1105,1,422,21102,709496668940,1,1,21102,421,1,0,1105,1,422,99,109,2,22101,0,-1,1,21102,1,40,2,21101,0,453,3,21102,443,1,0,1106,0,486,109,-2,2105,1,0,0,1,0,0,1,109,2,3,10,204,-1,1001,448,449,464,4,0,1001,448,1,448,108,4,448,10,1006,10,480,1102,1,0,448,109,-2,2106,0,0,0,109,4,2101,0,-1,485,1207,-3,0,10,1006,10,503,21102,0,1,-3,22102,1,-3,1,21201,-2,0,2,21101,1,0,3,21102,1,522,0,1106,0,527,109,-4,2105,1,0,109,5,1207,-3,1,10,1006,10,550,2207,-4,-2,10,1006,10,550,21202,-4,1,-4,1106,0,618,22102,1,-4,1,21201,-3,-1,2,21202,-2,2,3,21102,569,1,0,1106,0,527,21202,1,1,-4,21101,0,1,-1,2207,-4,-2,10,1006,10,588,21101,0,0,-1,22202,-2,-1,-2,2107,0,-3,10,1006,10,610,22101,0,-1,1,21101,0,610,0,106,0,485,21202,-2,-1,-2,22201,-4,-2,-4,109,-5,2106,0,0

11/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"fmt"
+	"github.com/csmith/aoc-2019/common"
+	"github.com/csmith/aoc-2019/intcode"
+)
+
+func run(memory []int, startWhite bool) (int, [500][500]bool) {
+	input := make([]int, len(memory))
+	copy(input, memory)
+	vm := intcode.NewVirtualMachine(input)
+	vm.Input = make(chan int, 1)
+	vm.Output = make(chan int, 1)
+	go vm.Run()
+
+	var grid [500][500]bool
+	var painted [500][500]bool
+
+	paintCount := 0
+	x := 250
+	y := 250
+	dir := 0
+	grid[y][x] = startWhite
+
+	for {
+		if grid[y][x] {
+			vm.Input <- 1
+		} else {
+			vm.Input <- 0
+		}
+
+		paint, more := <-vm.Output
+		if !more {
+			break
+		}
+		turn := <-vm.Output
+
+		grid[y][x] = paint == 1
+		if !painted[y][x] {
+			paintCount++
+			painted[y][x] = true
+		}
+
+		if turn == 1 {
+			dir = (dir + 1) % 4
+		} else {
+			dir = (dir + 3) % 4
+		}
+
+		switch dir {
+		case 0:
+			y--
+		case 1:
+			x++
+		case 2:
+			y++
+		case 3:
+			x--
+		}
+	}
+
+	return paintCount, grid
+}
+
+func main() {
+	input := common.ReadCsvAsInts("11/input.txt")
+	paintCount, _ := run(input, false)
+	_, grid := run(input, true)
+
+	println(paintCount)
+	for _, line := range grid {
+		for _, b := range line {
+			if b {
+				fmt.Print("█")
+			} else {
+				fmt.Print(" ")
+			}
+		}
+		fmt.Println()
+	}
+}

intcode/vm.go

@@ -29,21 +29,21 @@ func (vm *VirtualMachine) arg(pos int) *int {
 	mask := uint8(1) << uint8(pos)
 	if vm.parameterModes&mask == mask {
 		// Parameter mode - the value of the argument is just treated as an int
-		if vm.ip+1+pos > cap(vm.Memory) {
+		for vm.ip+1+pos > len(vm.Memory) {
 			vm.Memory = append(vm.Memory, make([]int, 1024)...)
 		}
 
 		return &vm.Memory[vm.ip+1+pos]
 	} else if vm.relativeModes&mask == mask {
 		// Relative mode - the value of the argument is treated as a memory offset from the relative base
-		if vm.ip+1+pos > cap(vm.Memory) || vm.rb+vm.Memory[vm.ip+1+pos] > cap(vm.Memory) {
+		for vm.ip+1+pos > len(vm.Memory) || vm.rb+vm.Memory[vm.ip+1+pos] > len(vm.Memory) {
 			vm.Memory = append(vm.Memory, make([]int, 1024)...)
 		}
 
 		return &vm.Memory[vm.rb+vm.Memory[vm.ip+1+pos]]
 	} else {
 		// Position mode - the value of the argument is treated as a memory offset from the start of the memory
-		if vm.ip+1+pos > cap(vm.Memory) || vm.Memory[vm.ip+1+pos] > cap(vm.Memory) {
+		for vm.ip+1+pos > len(vm.Memory) || vm.Memory[vm.ip+1+pos] > len(vm.Memory) {
 			vm.Memory = append(vm.Memory, make([]int, 1024)...)
 		}