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package main
import (
"fmt"
"io/ioutil"
"os"
"strconv"
)
func main() {
var memory []int
start, size := 0, 0
if len(os.Args) < 2 {
panic("runtime error: missing operand")
}
file, err := ioutil.ReadFile(os.Args[1])
if err != nil {
panic(err)
}
for i := 0; i < len(file); i++ {
if file[i] == ',' || file[i] == '\n' {
arg, err := strconv.Atoi(string(file[start:i])) // i-1??
if err != nil {
panic(err)
}
memory = append(memory, arg)
start = i + 1
size++
}
}
// fmt.Println(execute(memory, size))
// noun, verb := etucexe(memory, size, 19690720)
// fmt.Println(100*noun + verb)
execute(memory, size)
}
func split(memory []int, i, size int) (int, int, int) {
mode := memory[i] / 100
three, two, one := i+3, i+2, i+1
if size-i > 1 {
if mode%10 == 0 {
one = memory[i+1]
}
if size-i > 2 {
if mode/10%10 == 0 {
two = memory[i+2]
}
if size-i > 3 {
if mode/100 == 0 {
three = memory[i+3]
}
}
}
}
return three, two, one
}
func execute(memory []int, size int) []int {
for i := 0; i < len(memory); {
opcode := memory[i] % 100
three, two, one := split(memory, i, size)
switch opcode {
case 1: // adds
memory[three] = memory[one] + memory[two]
i += 4
case 2: // multiplies
memory[three] = memory[one] * memory[two]
i += 4
case 3: // input
var input int
fmt.Print("Input: ")
resp, err := fmt.Scanf("%d", &input)
if err != nil {
fmt.Println(resp, err)
os.Exit(0)
}
memory[one] = input // not affected by modes
i += 2
case 4: // output
fmt.Println(memory[one])
i += 2
case 5: // jump-if-true
if memory[one] != 0 {
i = memory[two] // ???
} else {
i += 3
}
case 6: // jump-if-false
if memory[one] == 0 {
i = memory[two] // ???
} else {
i += 3
}
case 7: // less than
if memory[one] < memory[two] {
memory[memory[i+3]] = 1
} else {
memory[memory[i+3]] = 0
}
i += 4
case 8: // equals
if memory[one] == memory[two] {
memory[memory[i+3]] = 1
} else {
memory[memory[i+3]] = 0
}
i += 4
case 99: // terminate
return memory
default:
fmt.Println("Unsupported code", opcode, "at", i)
os.Exit(0)
}
}
return memory
}
func etucexe(memory []int, size, output int) (int, int) {
var volatile []int
for i := 0; i < len(memory); i++ {
for j := 0; j < len(memory); j++ {
volatile = append([]int(nil), memory...) // reset volatile to memory
volatile[1], volatile[2] = i, j
if execute(volatile, size)[0] == output {
return i, j
}
}
}
return -1, -1
}
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