day02 p01 and p02

Author: lpvm

day02/day02_p01.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	f, err := ioutil.ReadFile("input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	s := strings.Split(string(f), ",")
+	opcodes := []int{}
+	for _, v := range s {
+		i, err := strconv.Atoi(v)
+		if err != nil {
+			continue
+		}
+		opcodes = append(opcodes, i)
+	}
+
+	opcodes[1] = 12
+	opcodes[2] = 2
+	i := 0
+	for {
+
+		if opcodes[i] == 99 {
+			fmt.Println("opcodes[0]: ", opcodes[0])
+			break
+		}
+
+		if opcodes[i] == 1 {
+			sum := 0
+			s1 := opcodes[i+1]
+			s2 := opcodes[i+2]
+			sum += opcodes[s1] + opcodes[s2]
+			s3 := opcodes[i+3]
+			opcodes[s3] = sum
+		} else if opcodes[i] == 2 {
+			sum := 0
+			s1 := opcodes[i+1]
+			s2 := opcodes[i+2]
+			sum += opcodes[s1] * opcodes[s2]
+			s3 := opcodes[i+3]
+			opcodes[s3] = sum
+		}
+		i += 4
+	}
+	fmt.Println("opcodes: ", opcodes)
+	fmt.Println("len(opcodes): ", len(opcodes))
+}
+
+// opcodes
+// 1: add the numbers in the positions of the next two values
+// 2: same thing, but multiply instead of adding
+// 99: halt immediately

day02/day02_p02.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	f, err := ioutil.ReadFile("input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	s := strings.Split(string(f), ",")
+	opcodes := []int{}
+	for _, v := range s {
+		i, err := strconv.Atoi(v)
+		if err != nil {
+			continue
+		}
+		opcodes = append(opcodes, i)
+	}
+
+	for noun := 0; noun <= 99; noun++ {
+		for verb := 0; verb <= 99; verb++ {
+			var tryCodes []int
+			tryCodes = make([]int, len(opcodes))
+			copy(tryCodes, opcodes)
+			tryCodes[1] = noun
+			tryCodes[2] = verb
+
+			i := 0
+			for {
+
+				if tryCodes[i] == 99 {
+					break
+				}
+
+				if tryCodes[i] == 1 {
+					sum := 0
+					s1 := tryCodes[i+1]
+					s2 := tryCodes[i+2]
+					sum += tryCodes[s1] + tryCodes[s2]
+					s3 := tryCodes[i+3]
+					tryCodes[s3] = sum
+				} else if tryCodes[i] == 2 {
+					sum := 0
+					s1 := tryCodes[i+1]
+					s2 := tryCodes[i+2]
+					sum += tryCodes[s1] * tryCodes[s2]
+					s3 := tryCodes[i+3]
+					tryCodes[s3] = sum
+				}
+				i += 4
+				if tryCodes[0] == 19690720 {
+					fmt.Println("noun: ", noun, "  verb: ", verb, "  100 * noun + verb: ", 100*noun+verb)
+					os.Exit(0)
+				}
+			}
+
+		}
+	}
+}
+
+// opcodes
+// 1: add the numbers in the positions of the next two values
+// 2: same thing, but multiply instead of adding
+// 99: halt immediately

day02/input.txt

@@ -0,0 +1 @@
+1,0,0,3,1,1,2,3,1,3,4,3,1,5,0,3,2,1,10,19,1,6,19,23,2,23,6,27,2,6,27,31,2,13,31,35,1,10,35,39,2,39,13,43,1,43,13,47,1,6,47,51,1,10,51,55,2,55,6,59,1,5,59,63,2,9,63,67,1,6,67,71,2,9,71,75,1,6,75,79,2,79,13,83,1,83,10,87,1,13,87,91,1,91,10,95,2,9,95,99,1,5,99,103,2,10,103,107,1,107,2,111,1,111,5,0,99,2,14,0,0