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advent18_test.go
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advent18_test.go
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package main
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
"testing"
"github.com/stretchr/testify/assert"
)
const input = `set a 1
add a 2
mul a a
mod a 5
snd a
set a 0
rcv a
jgz a -1
set a 1
jgz a -2
`
func TestExample1(t *testing.T) {
assert.Equal(t, 4, advent18(input))
}
func TestPart1(t *testing.T) {
bytes, err := ioutil.ReadFile("./input.txt")
if err != nil {
fmt.Print(err)
}
assert.Equal(t, 8600, advent18(string(bytes)))
}
func advent18(program string) int {
lastFrequency := -1
registers := map[string]int{}
lines := strings.Split(program, "\n")
for index := 0; index < len(lines); index++ {
instructions := strings.Split(lines[index], " ")
fmt.Println("index", index, " /", len(lines))
fmt.Println(instructions)
fmt.Println(lines)
switch instructions[0] {
case "set":
registers[instructions[1]] = valueOf(instructions[2], registers)
case "mul":
registers[instructions[1]] *= valueOf(instructions[2], registers)
case "add":
registers[instructions[1]] += valueOf(instructions[2], registers)
case "mod":
registers[instructions[1]] %= valueOf(instructions[2], registers)
case "jgz":
if registers[instructions[1]] != 0 {
offset := toInt(instructions[2])
if offset <= 0 {
offset -= 1
}
index += offset
}
case "rcv":
if registers[instructions[1]] != 0 {
return lastFrequency
}
case "snd":
lastFrequency = registers[instructions[1]]
}
fmt.Println(registers)
fmt.Println(lastFrequency)
}
return lastFrequency
}
func toInt(someString string) int {
value, err := strconv.Atoi(someString)
if err != nil {
fmt.Println(err)
return -1
}
return value
}
func valueOf(someString string, registers map[string]int) int {
value, err := strconv.Atoi(someString)
if err != nil {
fmt.Println(err)
return registers[someString]
}
return value
}