Implementation for day 13

challenge/day13/a.go

@@ -0,0 +1,67 @@
+package day13
+
+import (
+	"fmt"
+
+	"github.com/nlowe/aoc2019/challenge"
+	"github.com/nlowe/aoc2019/intcode"
+	"github.com/spf13/cobra"
+)
+
+const (
+	tileEmpty = iota
+	tileWall
+	tileBlock
+	tileHorizontalPaddle
+	tileBall
+)
+
+var A = &cobra.Command{
+	Use:   "13a",
+	Short: "Day 13, Problem A",
+	Run: func(_ *cobra.Command, _ []string) {
+		fmt.Printf("Answer: %d\n", a(challenge.FromFile()))
+	},
+}
+
+func a(challenge *challenge.Input) int {
+	cpu, out := intcode.NewCPUForProgram(<-challenge.Lines(), nil)
+
+	screen := map[int]map[int]int{}
+
+	go cpu.Run()
+
+	for {
+		x, ok := <-out
+		if !ok {
+			break
+		}
+
+		y, ok := <-out
+		if !ok {
+			break
+		}
+
+		tile, ok := <-out
+		if !ok {
+			break
+		}
+
+		if _, ok := screen[x]; !ok {
+			screen[x] = map[int]int{}
+		}
+
+		screen[x][y] = tile
+	}
+
+	tiles := 0
+	for _, col := range screen {
+		for _, tile := range col {
+			if tile == tileBlock {
+				tiles++
+			}
+		}
+	}
+
+	return tiles
+}

challenge/day13/b.go

@@ -0,0 +1,107 @@
+package day13
+
+import (
+	"fmt"
+	"math"
+
+	"github.com/gdamore/tcell"
+
+	"github.com/nlowe/aoc2019/intcode"
+
+	"github.com/nlowe/aoc2019/challenge"
+	"github.com/spf13/cobra"
+)
+
+const (
+	positionNeutral = 0
+	positionLeft    = -1
+	positionRight   = 1
+)
+
+var B = &cobra.Command{
+	Use:   "13b",
+	Short: "Day 13, Problem B",
+	Run: func(_ *cobra.Command, _ []string) {
+		fmt.Printf("Answer: %d\n", b(challenge.FromFile()))
+	},
+}
+
+func b(challenge *challenge.Input) int {
+	joystick := positionNeutral
+	cpu, out := intcode.NewCPUForProgram(<-challenge.Lines(), nil)
+	cpu.Memory[0] = 2
+
+	// TODO: Is there a way to keep input and output challens in sync wihtout this hack?
+	cpu.UseFloatingInput(func() int {
+		return joystick
+	})
+
+	term, err := tcell.NewScreen()
+	if err != nil {
+		panic(err)
+	}
+
+	if err := term.Init(); err != nil {
+		panic(err)
+	}
+	term.DisableMouse()
+	defer term.Fini()
+
+	bx := 0
+	px := math.MaxInt64
+
+	term.Clear()
+	score := 0
+
+	go cpu.Run()
+	for {
+		x, ok := <-out
+		if !ok {
+			return score
+		}
+
+		y, ok := <-out
+		if !ok {
+			return score
+		}
+
+		tile, ok := <-out
+		if !ok {
+			return score
+		}
+
+		if x == -1 && y == 0 {
+			score = tile
+		} else {
+			switch tile {
+			case tileBlock:
+				term.SetContent(x, y, tcell.RuneBlock, nil, tcell.StyleDefault)
+			case tileBall:
+				bx = x
+
+				if px != math.MaxInt64 {
+					if bx < px {
+						joystick = positionLeft
+					} else if bx > px {
+						joystick = positionRight
+					} else {
+						joystick = positionNeutral
+					}
+				}
+
+				term.SetContent(x, y, '0', nil, tcell.StyleDefault)
+			case tileHorizontalPaddle:
+				px = x
+				term.SetContent(x, y, '\u2582', nil, tcell.StyleDefault)
+			case tileWall:
+				term.SetContent(x, y, '=', nil, tcell.StyleDefault)
+			case tileEmpty:
+				term.SetContent(x, y, ' ', nil, tcell.StyleDefault)
+			}
+
+			term.Show()
+		}
+	}
+
+	return score
+}

challenge/day13/input.txt

@@ -0,0 +1 @@
+1,380,379,385,1008,2979,673982,381,1005,381,12,99,109,2980,1102,0,1,383,1101,0,0,382,20102,1,382,1,20101,0,383,2,21102,1,37,0,1106,0,578,4,382,4,383,204,1,1001,382,1,382,1007,382,45,381,1005,381,22,1001,383,1,383,1007,383,26,381,1005,381,18,1006,385,69,99,104,-1,104,0,4,386,3,384,1007,384,0,381,1005,381,94,107,0,384,381,1005,381,108,1105,1,161,107,1,392,381,1006,381,161,1101,-1,0,384,1106,0,119,1007,392,43,381,1006,381,161,1101,0,1,384,21002,392,1,1,21101,24,0,2,21102,0,1,3,21101,138,0,0,1106,0,549,1,392,384,392,21001,392,0,1,21102,24,1,2,21102,3,1,3,21102,1,161,0,1105,1,549,1101,0,0,384,20001,388,390,1,21001,389,0,2,21101,0,180,0,1106,0,578,1206,1,213,1208,1,2,381,1006,381,205,20001,388,390,1,20101,0,389,2,21102,1,205,0,1105,1,393,1002,390,-1,390,1102,1,1,384,21001,388,0,1,20001,389,391,2,21102,228,1,0,1105,1,578,1206,1,261,1208,1,2,381,1006,381,253,21001,388,0,1,20001,389,391,2,21102,253,1,0,1105,1,393,1002,391,-1,391,1101,0,1,384,1005,384,161,20001,388,390,1,20001,389,391,2,21101,279,0,0,1105,1,578,1206,1,316,1208,1,2,381,1006,381,304,20001,388,390,1,20001,389,391,2,21101,304,0,0,1106,0,393,1002,390,-1,390,1002,391,-1,391,1102,1,1,384,1005,384,161,21001,388,0,1,20101,0,389,2,21102,1,0,3,21102,1,338,0,1106,0,549,1,388,390,388,1,389,391,389,21002,388,1,1,21002,389,1,2,21101,4,0,3,21101,365,0,0,1105,1,549,1007,389,25,381,1005,381,75,104,-1,104,0,104,0,99,0,1,0,0,0,0,0,0,306,20,21,1,1,22,109,3,22101,0,-2,1,22102,1,-1,2,21101,0,0,3,21101,414,0,0,1106,0,549,21202,-2,1,1,22102,1,-1,2,21101,0,429,0,1105,1,601,2101,0,1,435,1,386,0,386,104,-1,104,0,4,386,1001,387,-1,387,1005,387,451,99,109,-3,2106,0,0,109,8,22202,-7,-6,-3,22201,-3,-5,-3,21202,-4,64,-2,2207,-3,-2,381,1005,381,492,21202,-2,-1,-1,22201,-3,-1,-3,2207,-3,-2,381,1006,381,481,21202,-4,8,-2,2207,-3,-2,381,1005,381,518,21202,-2,-1,-1,22201,-3,-1,-3,2207,-3,-2,381,1006,381,507,2207,-3,-4,381,1005,381,540,21202,-4,-1,-1,22201,-3,-1,-3,2207,-3,-4,381,1006,381,529,22101,0,-3,-7,109,-8,2105,1,0,109,4,1202,-2,45,566,201,-3,566,566,101,639,566,566,1202,-1,1,0,204,-3,204,-2,204,-1,109,-4,2105,1,0,109,3,1202,-1,45,594,201,-2,594,594,101,639,594,594,20101,0,0,-2,109,-3,2105,1,0,109,3,22102,26,-2,1,22201,1,-1,1,21102,1,587,2,21101,0,321,3,21101,1170,0,4,21101,630,0,0,1106,0,456,21201,1,1809,-2,109,-3,2105,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,2,2,0,0,0,2,2,2,0,0,0,0,2,0,0,2,2,2,0,2,0,0,2,0,2,0,2,0,2,2,0,0,2,2,0,0,0,0,0,2,0,1,1,0,2,2,0,0,0,2,0,2,2,0,2,0,2,2,0,0,2,0,0,0,2,0,0,0,0,2,0,0,0,0,0,0,0,2,0,0,2,2,2,2,0,0,1,1,0,2,0,2,2,0,0,2,2,2,2,0,2,0,2,0,0,2,0,0,0,2,0,2,2,0,2,0,0,2,2,2,0,2,0,0,0,2,0,0,0,2,0,1,1,0,2,0,0,0,2,0,0,2,0,2,0,0,0,0,2,0,2,2,0,2,0,2,0,2,0,2,0,0,0,0,2,0,0,2,0,0,2,0,0,0,0,0,1,1,0,2,0,2,0,0,0,2,0,2,2,0,0,0,2,0,0,2,0,0,0,0,2,2,2,0,0,2,0,2,2,0,2,2,0,2,0,0,0,0,2,0,0,1,1,0,2,0,2,0,0,2,0,0,0,0,0,2,0,2,0,2,0,0,0,2,0,0,2,0,0,2,0,0,0,0,2,0,2,0,0,0,2,2,0,2,0,0,1,1,0,2,0,0,0,2,0,2,2,0,0,0,0,2,0,0,2,0,0,2,0,0,0,2,0,2,0,2,0,2,0,0,0,0,2,2,2,0,0,0,0,2,0,1,1,0,2,0,2,0,2,2,0,2,2,2,2,2,0,0,0,2,0,0,2,0,0,0,0,0,0,0,2,2,2,0,2,2,0,0,0,0,0,2,0,2,2,0,1,1,0,0,0,2,2,0,2,2,2,2,0,0,2,2,0,2,0,0,2,2,0,0,2,0,2,0,2,0,0,2,0,0,0,0,0,0,0,0,0,0,2,0,0,1,1,0,2,0,2,0,2,0,2,2,2,0,0,2,2,2,2,0,0,2,2,2,0,0,0,2,0,0,2,2,2,2,2,0,2,0,2,2,0,2,2,2,2,0,1,1,0,2,0,0,0,2,0,0,0,0,0,0,2,0,2,0,0,0,0,0,0,0,0,0,2,2,2,0,0,0,2,2,0,2,0,0,0,2,0,0,2,0,0,1,1,0,2,0,2,0,2,0,2,0,2,0,2,2,2,2,0,0,0,0,2,2,0,2,0,0,2,0,0,2,0,0,0,0,2,2,2,2,0,2,2,0,2,0,1,1,0,0,0,2,2,0,0,0,0,2,2,2,0,0,0,2,2,0,2,0,0,2,2,2,2,0,2,0,0,0,0,2,0,0,0,0,2,0,2,2,2,0,0,1,1,0,2,2,0,2,0,0,0,0,0,0,2,2,0,0,2,0,0,2,2,0,2,0,0,0,0,2,2,0,2,0,2,2,0,0,0,0,0,0,2,0,0,0,1,1,0,2,0,2,2,0,0,2,0,0,2,0,2,2,2,2,2,0,2,0,0,2,2,0,2,0,2,2,0,0,0,0,2,0,2,2,0,2,0,0,0,0,0,1,1,0,0,0,0,2,2,0,2,2,2,0,0,0,0,2,0,2,2,2,0,2,0,0,2,2,0,2,0,0,0,2,0,0,0,2,2,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,2,0,0,2,0,0,0,2,0,2,0,0,0,2,0,2,2,0,0,2,0,2,0,2,2,0,2,0,0,2,0,0,2,2,0,0,1,1,0,0,2,0,0,2,0,0,2,0,0,2,2,0,0,0,0,0,2,2,0,2,2,0,0,0,0,0,2,0,0,2,2,0,0,0,2,0,0,2,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,16,49,6,70,42,11,9,96,27,54,49,26,55,46,33,78,80,33,71,39,43,60,11,91,27,20,80,62,34,64,19,4,56,17,24,21,59,6,44,87,8,82,47,82,83,9,32,84,73,89,82,14,6,66,27,27,72,34,14,41,98,57,61,48,13,9,22,15,21,76,85,28,6,58,47,62,18,62,27,71,29,87,55,16,8,87,10,93,52,81,72,52,14,53,80,97,17,10,2,19,25,55,24,93,70,43,87,23,54,34,93,83,69,30,96,65,15,87,32,64,34,32,84,72,5,48,74,44,3,30,84,23,80,60,18,85,96,35,31,47,40,98,71,34,27,5,84,81,37,39,33,25,27,92,47,57,10,9,93,95,30,97,48,82,18,46,9,86,22,14,75,18,29,20,65,11,2,81,52,11,43,64,2,91,47,55,68,36,96,37,55,32,77,65,41,27,96,97,33,73,58,4,51,78,93,52,6,90,94,19,16,57,7,85,89,67,57,38,84,61,88,24,76,72,40,74,2,79,54,49,35,61,36,27,69,25,87,89,70,39,79,72,64,73,18,23,64,54,65,8,25,18,41,87,59,19,79,89,22,43,78,87,2,12,78,68,52,51,96,79,88,72,73,79,6,59,83,62,4,55,44,16,77,81,19,19,48,17,51,64,59,59,19,64,48,28,71,70,57,41,52,15,70,45,25,51,30,6,14,82,20,20,11,71,81,82,39,90,33,34,86,48,68,29,54,32,48,22,79,35,82,81,86,83,49,71,46,75,25,81,50,18,88,97,60,64,26,12,92,3,81,58,10,21,5,65,80,20,80,38,21,42,13,35,49,81,35,82,38,26,84,41,3,52,70,41,65,61,47,55,60,12,16,52,15,3,51,11,12,5,19,51,24,54,24,2,13,3,98,1,86,55,67,4,87,34,81,29,65,6,60,88,77,19,67,37,33,29,35,42,71,74,11,81,95,89,93,55,35,60,43,65,40,85,97,26,87,97,51,44,22,35,52,30,24,29,78,73,75,62,46,38,44,62,20,2,2,67,60,44,80,71,25,63,84,31,36,89,80,91,64,5,3,84,28,31,36,56,35,69,17,85,85,97,6,21,15,10,21,97,20,68,83,12,51,13,91,76,44,50,89,92,77,15,33,85,91,89,71,13,41,36,55,51,1,15,48,52,23,13,31,80,73,98,17,36,52,32,88,59,28,29,86,9,56,30,21,66,98,81,69,25,82,61,86,7,68,62,71,57,9,36,54,53,71,82,21,88,87,94,80,5,29,48,12,23,78,16,30,10,13,53,90,64,30,90,50,89,61,43,20,5,33,45,28,21,77,61,77,28,73,34,35,8,1,47,18,29,95,47,88,34,46,31,31,67,74,16,40,75,88,91,53,55,86,64,22,94,87,91,43,3,14,48,94,68,91,4,49,50,50,4,35,1,90,25,36,90,18,11,17,14,96,55,17,88,24,15,97,80,70,41,81,8,67,41,90,29,29,72,94,69,84,29,34,33,37,51,66,22,35,87,17,84,86,75,30,8,38,1,80,9,84,7,62,84,14,85,58,43,50,19,1,87,97,75,38,33,57,80,93,38,95,48,84,86,67,57,10,27,45,33,94,13,37,71,96,29,63,82,86,14,46,76,15,93,34,47,60,27,2,1,21,93,15,34,62,96,56,90,5,68,73,71,80,75,52,13,49,38,51,76,60,54,29,96,5,28,98,13,78,53,16,49,52,63,43,37,88,86,3,56,96,21,78,92,97,10,66,86,36,9,6,39,59,57,83,51,76,50,58,52,8,4,11,44,73,85,62,6,35,96,86,53,13,32,22,49,72,44,94,14,95,75,55,28,36,2,33,86,73,62,44,59,84,55,4,36,7,79,10,49,49,80,26,3,22,44,87,63,60,26,13,86,11,27,64,80,81,95,77,80,39,41,81,15,81,76,37,42,41,26,51,43,88,76,82,25,55,94,37,75,11,65,44,97,78,56,66,23,50,76,6,28,75,63,16,91,15,79,47,41,73,36,2,77,79,77,73,11,36,37,1,31,76,82,74,68,50,35,48,72,71,72,90,41,66,65,90,82,48,49,21,54,74,57,24,9,29,2,6,9,51,52,77,80,33,34,8,89,77,16,19,78,22,30,18,74,98,45,31,28,29,91,67,16,51,75,94,90,51,75,80,8,18,66,89,44,24,20,31,59,12,89,52,33,58,59,94,89,91,84,95,8,59,67,13,19,84,28,89,22,39,6,90,3,10,84,98,25,22,9,91,27,74,76,85,45,37,27,58,17,92,92,31,24,44,89,68,12,82,23,36,7,18,71,43,46,17,5,94,14,83,32,67,7,76,95,20,53,8,18,68,89,58,60,40,75,70,38,38,38,14,39,39,37,73,81,2,45,18,80,13,8,86,31,74,21,4,75,51,26,30,52,50,65,37,81,29,14,76,83,78,79,48,52,73,36,15,82,55,47,76,54,29,10,75,50,85,68,39,78,34,69,16,14,49,27,12,15,17,17,66,42,18,40,17,98,7,15,94,93,36,17,44,45,57,20,78,24,33,48,68,52,49,52,95,19,63,59,4,40,4,38,78,5,84,55,40,88,74,48,85,24,30,18,12,2,30,13,98,3,93,65,63,53,23,7,37,63,673982

go.mod

@@ -3,6 +3,7 @@ module github.com/nlowe/aoc2019
 go 1.13
 
 require (
+	github.com/gdamore/tcell v1.3.0
 	github.com/go-sqlite/sqlite3 v0.0.0-20180313105335-53dd8e640ee7 // indirect
 	github.com/gonuts/binary v0.2.0 // indirect
 	github.com/keybase/go-keychain v0.0.0-20191114153608-ccd67945d59e // indirect

go.sum

@@ -1,6 +1,8 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/DATA-DOG/go-sqlmock v1.3.3 h1:CWUqKXe0s8A2z6qCgkP4Kru7wC11YoAnoupUKFDnH08=
+github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
@@ -26,6 +28,10 @@ github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZm
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell v1.3.0 h1:r35w0JBADPZCVQijYebl6YMWWtHRqVEGt7kL2eBADRM=
+github.com/gdamore/tcell v1.3.0/go.mod h1:Hjvr+Ofd+gLglo7RYKxxnzCBmev3BzsS67MebKS4zMM=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
@@ -67,9 +73,13 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/lucasb-eyer/go-colorful v1.0.2 h1:mCMFu6PgSozg9tDNMMK3g18oJBX7oYGrC09mS6CXfO4=
+github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
+github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
@@ -163,6 +173,7 @@ golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9 h1:ZBzSG/7F4eNKz2L3GE9o300RX0Az1Bw5HF7PDraD+qU=
 golang.org/x/sys v0.0.0-20191128015809-6d18c012aee9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=

intcode/cpu.go

@@ -16,11 +16,14 @@ const (
 	RAMSize = 8192
 )
 
+type floatingInputProvider func() int
+
 type CPU struct {
 	Memory []int
 
-	input  <-chan int
-	output chan<- int
+	input         <-chan int
+	output        chan<- int
+	floatingInput floatingInputProvider
 
 	pc             int
 	relativeOffset int
@@ -38,6 +41,10 @@ func NewCPUForProgram(program string, inputs <-chan int) (*CPU, <-chan int) {
 	return &CPU{Memory: memory, input: inputs, output: output}, output
 }
 
+func (c *CPU) UseFloatingInput(p floatingInputProvider) {
+	c.floatingInput = p
+}
+
 func (c *CPU) Run() {
 	for !c.IsHalted() {
 		c.Step()

intcode/microcode.go

@@ -19,6 +19,11 @@ var microcode = map[int]opFunc{
 		return 1 + instruction.ArgCount(instruction.Mul)
 	},
 	instruction.In: func(m3, m2, m1 int, c *CPU) int {
+		if c.floatingInput != nil {
+			c.write(m1, 1, c.floatingInput())
+			return 1 + instruction.ArgCount(instruction.In)
+		}
+
 		select {
 		case v := <-c.input:
 			c.write(m1, 1, v)

main.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/nlowe/aoc2019/challenge/day13"
+
 	"github.com/nlowe/aoc2019/challenge/day1"
 	"github.com/nlowe/aoc2019/challenge/day10"
 	"github.com/nlowe/aoc2019/challenge/day11"
@@ -65,6 +67,7 @@ func init() {
 		day10.A, day10.B,
 		day11.A, day11.B,
 		day12.A, day12.B,
+		day13.A, day13.B,
 	)
 
 	flags := rootCmd.PersistentFlags()