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base: advent-of-code:dev/20
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advent-of-code:main advent-of-code:dev/24 advent-of-code:dev/21 advent-of-code:dev/20 advent-of-code:dev/19 advent-of-code:dev/18 advent-of-code:dev/17 advent-of-code:dev/15 advent-of-code:dev/14
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compare: advent-of-code:dev/21
Branches Tags
advent-of-code:main advent-of-code:dev/24 advent-of-code:dev/21 advent-of-code:dev/20 advent-of-code:dev/19 advent-of-code:dev/18 advent-of-code:dev/17 advent-of-code:dev/15 advent-of-code:dev/14

3 Commits
dev/20 ... dev/21

Author SHA1 Message Date
Parnic
30bdd9b016 Explain and implement logic 
Programs coded into a machine that runs a program that's coded into a machine that runs a program. I think this is how Javascript got invented or something.
 2022-06-24 23:16:32 -05:00
Parnic
15b34197ee Day 21 setup 
Plus some tweaks to make ASCII IntCode machines slightly easier to use.

I need to figure out some good criteria for coding this robot thing to avoid gaps of all sizes. #..#.# is the first thing I'm seeing that's giving me trouble, we'd need to know 4 squares ahead of that little island that it was coming since that's how long it takes to jump and come back down. But we can't jump too soon if the gap is actually 3 wide, for example, or if the gap on the other side of the island is also going to be a problem. Ugh.
 2022-06-23 17:22:35 -05:00
Parnic
34e6055782 Day 20 solution 
Part 1 was pretty much just day 18 again, but without doors and with an input data parsing skill check. I simplified day 18 and went with a basic Dijkstra algorithm after the DFS to crawl the maze which solved this just fine.

Part 2 messed me up more than I was expecting. The key feature for part 2 is changing up what the Dijkstra solver views as an "adjacent" node and injecting the appropriate depth as we traverse inner/outer portals. The main thing that tripped me up here from part 1 was that I needed to be carrying more data along with portals than just their locations, and I could no longer get away with storing the portals as pairs of their inner/outer locations, so a small refactor was needed. Once I made those corrections, it was mostly a matter of ironing out the "get neighbors" function to adhere to part 2's rules, which took me a lot of debugging to get just right.

Part 2 still took me longer than I'd care to admit. I had problems wrapping my head around the problem.
 2022-06-22 23:35:29 -05:00
6 changed files with 237 additions and 133 deletions
Expand all files Collapse all files

6
days/17.go
View File

@ -48,6 +48,7 @@ type Day17 struct {
func (d *Day17) Parse() {
d.program = u.LoadIntcodeProgram("17p")
// d.program.SetDebugASCIIPrint(true)
}
func (d Day17) Num() int {
@ -388,9 +389,8 @@ func (d *Day17) Part2() string {
row := 0
var outputState int
var lastOutput int64
var instructionStr string
d.program.RunIn(func(inputStep int) int64 {
return int64(instructionStr[inputStep-1])
panic("unexpected read")
}, func(val int64, state u.IntcodeProgramState) {
rVal := rune(val)
if outputState == 0 {
@ -401,7 +401,7 @@ func (d *Day17) Part2() string {
if rVal == '\n' && lastOutput == '\n' {
if outputState == 0 {
instructionStr = beforeGrid.solvePath(beforeBotLocation, beforeBotFacing)
d.program.FeedInputString(beforeGrid.solvePath(beforeBotLocation, beforeBotFacing))
}
outputState++
row = 0

85
days/21.go Normal file
View File

@ -0,0 +1,85 @@
package days
import (
"fmt"
"strings"
u "parnic.com/aoc2019/utilities"
)
type Day21 struct {
program u.IntcodeProgram
}
func (d *Day21) Parse() {
d.program = u.LoadIntcodeProgram("21p")
// d.program.SetDebugASCIIPrint(true)
}
func (d Day21) Num() int {
return 21
}
func (d *Day21) Part1() string {
// if there's any hole up to 3 ahead of us but there's ground where we'd land if we jumped
// (a jump takes 4 spaces), go ahead and jump
cmds := []string{
// check if a hole at 1 or 2 ahead
"NOT A T",
"NOT B J",
// store that result in J
"OR T J",
// check if a hole at 3 ahead
"NOT C T",
// store hole in 1, 2, or 3 in T
"OR J T",
// set J true if hole in 1, 2, or 3
"OR T J",
// set J true if also no hole at 4 ahead
"AND D J",
"WALK",
}
instructionStr := strings.Join(cmds, "\n") + "\n"
d.program.FeedInputString(instructionStr)
res := d.program.Run()
return fmt.Sprintf("Hull damage value when walking: %s%d%s", u.TextBold, res, u.TextReset)
}
func (d *Day21) Part2() string {
// @
// #####.#.##.##.###
// ABCDEFGHI
// using the first program, this kills us. if we jump, we land at D and H becomes our new D, so it won't jump again.
// but if we waited to jump until we got one more ahead, we'd be ok.
// so now we want to know essentially the same thing as part 1, but also if our multiple (immediate second jump) would be successful.
// in problem terms, that's: if there's a hole at 1 or 2 ahead, and there's a hole at C with ground at H, and there's ground at D.
// so now for the above example we'd wait to jump until here:
// @
// #####.#.##.##.###
// ABCDEFGHI
// and all will be well.
cmds := []string{
// check if a hole at 1 or 2 ahead
"NOT A J",
"NOT B T",
// store that result in J
"OR T J",
// check if a hole at 3 ahead...
"NOT C T",
// and ground at 8 ahead (so we can immediately jump again if needed)...
"AND H T",
// combine those into J
"OR T J",
// and ensure we also still have a place to land if we jumped right away
"AND D J",
"RUN",
}
instructionStr := strings.Join(cmds, "\n") + "\n"
d.program.FeedInputString(instructionStr)
res := d.program.Run()
return fmt.Sprintf("Hull damage value when running: %s%d%s", u.TextBold, res, u.TextReset)
}

238
inputs/20p.txt
View File

@ -1,125 +1,113 @@
J L P P V T X
G V M I O R C
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Y S R S F F H
Q Y Q I M W R

1
inputs/21p.txt Normal file
View File

File diff suppressed because one or more lines are too long

1
main.go
View File

@ -54,6 +54,7 @@ var dayMap = []day{
&days.Day18{},
&days.Day19{},
&days.Day20{},
&days.Day21{},
}
func main() {

39
utilities/intcode.go
View File

@ -28,6 +28,8 @@ type IntcodeProgram struct {
program []int64
relativeBase int
haltRequested bool
printASCII bool
feedInput []rune
}
type IntcodeProgramState struct {
@ -140,14 +142,15 @@ func (p *IntcodeProgram) Reset() {
p.relativeBase = 0
}
func (p *IntcodeProgram) Run() {
p.RunIn(func(int) int64 { return 0 }, func(int64, IntcodeProgramState) {})
func (p *IntcodeProgram) Run() int64 {
return p.RunIn(func(int) int64 { return 0 }, func(int64, IntcodeProgramState) {})
}
func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOutputFunc) {
func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOutputFunc) int64 {
p.init()
inputsRequested := 0
lastOutput := int64(0)
for instructionPointer := 0; instructionPointer < len(p.program) && !p.haltRequested; {
instruction := p.GetMemory(instructionPointer)
instructionPointer++
@ -184,13 +187,28 @@ func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOut
case opInput:
inputsRequested++
param1 := p.GetMemory(instructionPointer)
p.setMemory(int(param1), inputFunc(inputsRequested), paramModes[0])
var inputVal int64
if len(p.feedInput) > 0 {
inputVal = int64(p.feedInput[0])
p.feedInput = p.feedInput[1:]
} else {
inputVal = inputFunc(inputsRequested)
}
if p.printASCII && inputVal <= 255 {
fmt.Printf("%c", rune(inputVal))
}
p.setMemory(int(param1), inputVal, paramModes[0])
instructionPointer += 1
case opOutput:
param1 := p.GetMemory(instructionPointer)
outputFunc(p.getParamValue(int(param1), paramModes[0]), p.makeState(instructionPointer))
param1Val := p.getParamValue(int(param1), paramModes[0])
if p.printASCII && param1Val <= 255 {
fmt.Printf("%c", rune(param1Val))
}
outputFunc(param1Val, p.makeState(instructionPointer))
lastOutput = param1Val
instructionPointer += 1
@ -256,8 +274,19 @@ func (p *IntcodeProgram) RunIn(inputFunc ProvideInputFunc, outputFunc ReceiveOut
}
p.haltRequested = false
return lastOutput
}
func (p *IntcodeProgram) Stop() {
p.haltRequested = true
}
func (p *IntcodeProgram) SetDebugASCIIPrint(enable bool) {
p.printASCII = enable
}
func (p *IntcodeProgram) FeedInputString(str string) {
p.feedInput = make([]rune, len(str))
copy(p.feedInput, []rune(str))
}