commit 25b8bbe6203fa094f3e803a69779e4f87db9d6a3
parent d924f349626476d8aaf2adc258dafb23a2866476
Author: bsandro <email@bsandro.tech>
Date: Sat, 3 Dec 2022 06:16:49 +0000
Day 03 part 1
Diffstat:
3 files changed, 373 insertions(+), 0 deletions(-)
diff --git a/day03/input.txt b/day03/input.txt
@@ -0,0 +1,300 @@
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diff --git a/day03/main.go b/day03/main.go
@@ -0,0 +1,67 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "log"
+ "os"
+)
+
+func main() {
+ if len(os.Args) > 1 {
+ day03(os.Args[1])
+ } else if len(os.Args) == 1 {
+ fmt.Printf("usage: %s inputfile.txt\n", os.Args[0])
+ } else {
+ fmt.Println("No input data")
+ }
+}
+
+func day03(input_file string) {
+ fmt.Printf("day 03 input filename: %s\n", input_file)
+ input, err := os.Open(input_file)
+ if err != nil {
+ log.Fatal(err)
+ }
+ defer input.Close()
+ scanner := bufio.NewScanner(input)
+ var sum int32 = 0
+ for scanner.Scan() {
+ same := findSame(scanner.Text())
+ // unicode rune to fantasy scoring
+ if same >= 97 { // lowercase
+ same -= 96
+ } else if same >= 65 { // uppercase
+ same -= 38
+ } else {
+ log.Fatal("Invalid rune")
+ }
+ fmt.Printf("%v\n", same)
+ sum += same
+ }
+ fmt.Println("Part 1:", sum)
+ if err = scanner.Err(); err != nil {
+ log.Fatal(err)
+ }
+}
+
+func findSame(in string) int32 {
+ strLen := len(in)
+ if strLen % 2 != 0 {
+ log.Fatal("invalid input string")
+ }
+
+ comp1 := in[0:strLen/2]
+ comp2 := in[strLen/2:]
+
+ // only 1 misplaced item per rucksack
+ for _, rune1 := range comp1 {
+ for _, rune2 := range comp2 {
+ if rune1 == rune2 {
+ return rune1
+ }
+ }
+ }
+
+ return 0
+}
diff --git a/day03/sample.txt b/day03/sample.txt
@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw
