days 10-11

2021-12-11 21:08:15 +00:00
parent b49cb6a1ab
commit 5125b326b3
4 changed files with 279 additions and 0 deletions
@@ -0,0 +1,102 @@
+[<[{<[(([<[[{[()()]}]{<<<>[]>[()[]]>{(<>[]){<>[]}}}]<{(<()<>>{()<>})(<()>)}([{()[]}](<()<>>
+<[(<({[<(<<({({}[])[<>]}[<<>{}>[()()]])>>)>]})>{[([({[{{<[[]{}]{{}}><{()[]}[{}]>}}{{[<<>()>((){})
+{<({([<([[<<[(<>())({}{})](<()()>{{}})>(([[]{}]<[][]>){<{}>{<>{}}})>]][[((<[<>()]<<>[]>>{{()[]}{[]{}
+([{({<<{<<<{([{}[]]([]())){[(){}]}}{[<{}()>(<>[])]}][({[()<>][<><>]}{{{}[]}})<<<{}()>>>]>([[<[{}<>]
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+<({<[([{[[<{<{[]{}}[<>]>}>([(<()[]>[[]<>])<{<>[]}>]{[(()())[{}]][<{}<>><{}>]})]]([{{{([]{})[(){}]}[<
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@@ -0,0 +1,123 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"sort"
+	"strings"
+)
+
+type Stack []string
+
+func (s *Stack) push(i string) {
+	*s = append(*s, i)
+}
+
+func (s *Stack) pop() string {
+	ret := s.peek()
+	*s = (*s)[:len(*s)-1]
+	return ret
+}
+
+func (s *Stack) peek() string {
+	return (*s)[len(*s)-1]
+}
+
+func main() {
+	file, err := os.Open("input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	scanner.Split(bufio.ScanLines)
+	var errorTotal int
+	var completionTotals []int
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		errorScore, completionScore := solve(line)
+		errorTotal += errorScore
+		if completionScore > 0 {
+			completionTotals = append(completionTotals, completionScore)
+		}
+	}
+	sort.Ints(completionTotals)
+	fmt.Println(errorTotal, completionTotals[len(completionTotals)/2])
+}
+
+func solve(line string) (errorScore, completionScore int) {
+	blah := strings.Split(line, "")
+	var s Stack
+	for _, v := range blah {
+		if len(s) == 0 || isOpening(v) {
+			s.push(v)
+			continue
+		}
+		if getClosing(s.peek()) != v {
+			//fmt.Println("Corruption: expected " + getClosing(s.peek()) + " but got " + v)
+			return getErrorScore(v), -1
+		} else {
+			s.pop()
+		}
+	}
+	for len(s) > 0 {
+		completionScore *= 5
+		completionScore += getCompletionScore(getClosing(s.pop()))
+	}
+	return
+}
+
+func isOpening(test string) bool {
+	return test == "[" || test == "(" || test == "<" || test == "{"
+}
+
+func getClosing(opening string) string {
+	switch opening {
+	case "[":
+		return "]"
+	case "(":
+		return ")"
+	case "<":
+		return ">"
+	case "{":
+		return "}"
+	default:
+		return "Unhandled chunk"
+	}
+}
+
+func getErrorScore(closing string) int {
+	switch closing {
+	case ")":
+		return 3
+	case "]":
+		return 57
+	case "}":
+		return 1197
+	case ">":
+		return 25137
+	default:
+		fmt.Println("Unhandled error score for " + closing)
+		return -1
+	}
+}
+
+func getCompletionScore(closing string) int {
+	switch closing {
+	case ")":
+		return 1
+	case "]":
+		return 2
+	case "}":
+		return 3
+	case ">":
+		return 4
+	default:
+		fmt.Println("Unhandled completion score for " + closing)
+		return -1
+	}
+}