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https://github.com/Threnklyn/advent-of-code-go.git
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alexchao26
46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package main
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import (
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"github.com/alexchao26/advent-of-code-go/util"
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"fmt"
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"strconv"
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"strings"
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)
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func main() {
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// read the input file and place into slice of strings
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inputFile := util.ReadFile("../input.txt")
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splitStrings := strings.Split(inputFile, ", ")
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// convert to slice of numbers
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inputNumbers := make([]int, len(splitStrings))
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for i, v := range splitStrings {
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inputNumbers[i], _ = strconv.Atoi(v)
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}
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// start running the step function
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step(inputNumbers, 0)
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fmt.Println("Final value at address 0 is:", inputNumbers[0])
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}
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// step will read the next 4 values in the input `sli` and make updates according to the opcodes
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func step(sli []int, index int) bool {
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if sli[index] == 99 {
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return false
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}
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opcode, two, three, four := read(sli, index)
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switch opcode {
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case 1:
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sli[four] = sli[two] + sli[three]
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case 2:
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sli[four] = sli[two] * sli[three]
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}
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// recursively call itself & increment index value...
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return step(sli, index+4)
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}
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// this read function may be necessary later as the intcode thingy becomes more complex
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func read(sli []int, index int) (int, int, int, int) {
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return sli[index], sli[index+1], sli[index+2], sli[index+3]
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}
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