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package main
import (
"fmt"
"io/ioutil"
"os"
"strconv"
)
func main() {
var slice []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)
}
slice = append(slice, arg)
start = i + 1
size++
}
}
noun, verb := edocpo(slice, 19690720)
slice[1] = 12
slice[2] = 2
fmt.Println(opcode(slice)[0])
fmt.Println(100*noun + verb)
}
func opcode(slice []int) []int {
for i := 0; i < len(slice); i += 4 {
if slice[i] == 1 {
slice[slice[i+3]] = slice[slice[i+1]] + slice[slice[i+2]]
} else if slice[i] == 2 {
slice[slice[i+3]] = slice[slice[i+1]] * slice[slice[i+2]]
} else if slice[i] == 99 {
return slice
} else {
fmt.Println("Unsupported code", slice[i], "at", i)
os.Exit(0)
}
}
return slice
}
func edocpo(slice []int, output int) (int, int) {
var ecils []int
for i := 0; i < len(slice); i++ {
for j := 0; j < len(slice); j++ {
ecils = append([]int(nil), slice...) // reset ecils to slice
ecils[1], ecils[2] = i, j
if opcode(ecils)[0] == output {
return i, j
}
}
}
return -1, -1
}
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