From 0860573c1e0f118c55ab6e7db9d4a8f982122d4d Mon Sep 17 00:00:00 2001
From: Luke Else <mail@luke-else.co.uk>
Date: Fri, 10 Dec 2021 22:21:30 +0000
Subject: [PATCH] day 10a complete

first time using a stack, can recommend
---
 day10/day 10a/go.mod    |   3 ++
 day10/day 10a/main.go   |  71 ++++++++++++++++++++++++++++
 day10/day 10a/stack.go  |  39 +++++++++++++++
 day10/day 10a/testInput |  10 ++++
 day10/input             | 102 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 225 insertions(+)
 create mode 100644 day10/day 10a/go.mod
 create mode 100644 day10/day 10a/main.go
 create mode 100644 day10/day 10a/stack.go
 create mode 100644 day10/day 10a/testInput
 create mode 100644 day10/input

diff --git a/day10/day 10a/go.mod b/day10/day 10a/go.mod
new file mode 100644
index 0000000..e938e2e
--- /dev/null
+++ b/day10/day 10a/go.mod	
@@ -0,0 +1,3 @@
+module PWD
+
+go 1.17
diff --git a/day10/day 10a/main.go b/day10/day 10a/main.go
new file mode 100644
index 0000000..dc9f4b3
--- /dev/null
+++ b/day10/day 10a/main.go	
@@ -0,0 +1,71 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+	content := returnContent("../input")
+	//content := returnContent("testInput")
+
+	var bracketMap map[byte]byte = make(map[byte]byte)
+	var bracketCost map[byte]int = make(map[byte]int)
+
+	answer := 0
+
+	bracketMap[')'] = '('
+	bracketMap[']'] = '['
+	bracketMap['}'] = '{'
+	bracketMap['>'] = '<'
+
+	bracketCost[')'] = 3
+	bracketCost[']'] = 57
+	bracketCost['}'] = 1197
+	bracketCost['>'] = 25137
+
+	for _, row := range *content {
+		var stack Stack = Stack{}
+		for _, char := range row {
+			brack, found := bracketMap[char]
+
+			if !found {
+				//If it is an opening bracket
+				stack.Push(char)
+			} else {
+				if brack == stack.Peek().char {
+					stack.Pop()
+				} else {
+					answer += bracketCost[char]
+					fmt.Println("Illegal,", char, "found", answer)
+					break
+				}
+			}
+		}
+	}
+
+	fmt.Println(answer)
+
+}
+
+func returnContent(path string) *[][]byte {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content [][]byte
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	for scanner.Scan() {
+		content = append(content, []byte(scanner.Text()))
+	}
+
+	return &content
+}
diff --git a/day10/day 10a/stack.go b/day10/day 10a/stack.go
new file mode 100644
index 0000000..8dca597
--- /dev/null
+++ b/day10/day 10a/stack.go	
@@ -0,0 +1,39 @@
+package main
+
+type Stack struct {
+	head *StackNode
+}
+
+func (s *Stack) Push(item byte) {
+	if s.head == nil {
+		s.head = &StackNode{
+			char: item,
+			next: nil,
+		}
+	} else {
+		new := StackNode{
+			char: item,
+			next: s.head,
+		}
+		s.head = &new
+	}
+}
+
+func (s *Stack) Pop() byte {
+	node := s.Peek()
+	s.head = node.next
+	return node.char
+}
+
+func (s *Stack) Peek() (node *StackNode) {
+	node = s.head
+	if node == nil {
+		node = &StackNode{}
+	}
+	return
+}
+
+type StackNode struct {
+	char byte
+	next *StackNode
+}
diff --git a/day10/day 10a/testInput b/day10/day 10a/testInput
new file mode 100644
index 0000000..2f182d8
--- /dev/null
+++ b/day10/day 10a/testInput	
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
\ No newline at end of file
diff --git a/day10/input b/day10/input
new file mode 100644
index 0000000..32137c9
--- /dev/null
+++ b/day10/input
@@ -0,0 +1,102 @@
+([({<(({<[(<([{}<>])<(()<>){<>[]}>>[[{<>{}}[<>{}]][(<>[])<{}<>>]]){[{{[][]}[[]{}]}({{}[]}[{}<>])]({({}{})
+([{{[(<{[{{<[{{}[]}{(){}}]{[{}{})([]())}>}(({{{}}{<>{}}}{(()[])(()<>)}){<<{}()><[][]>>})}(<<<(<
+((<[[<([[({{[([]{})([][])]{({}())(()}}}({[[][]](()<>)}(<[]{}>[[]{}]))}<[[{()<>}<[][]>]]{{{
+{{[{{<[{[[(<((<>())(<><>))<<()[]>>>)<<<(<><>)[()()]><([])<[]>>>{{({}()){[][]}}<[[]]>}>]]<[
+[<{(<{<<[[[[(<{}()>{{}()})[[()()]<{}()>]]{{<<><>>({}<>)}(([]{})[{}<>]}}]{{({[]<>}{[][]})<[<>[]]<{}()>>}[{
+<<{<{<<{<<[(([<>()][<>{}])[<()<>>{()[]}])[<({})<<>[]>><<[][]>[[]<>]>]]>>((<<<(<>[])[{}{}]>[<[]{}>({})]>>)<
+<[[[(<{[{((<{(()[])[{}<>]}([[][]][()<>])>[(<[]())<<><>>){({}{}){<>[]}}]))}]}>{<([<<[<(()<>)
+({{{<<<{({[{[<()[]>({}())]{<{}()>({}{})}}]{([(<>)<[]<>>]{([]<>)(()())})(<<<><>>{{}{}}>[({}{})<()
+{{<<[<[{<(({{({}<>)<<>()>}{{{}<>}}}{<({}())({}<>)>([<><>]{()[]})}))<[<{<[]{}>([][])}((<>())({}[]
+[[<([({<<<<{<{<><>}{()<>}>}>{(([[]{}>[{}()])[[[][]]])(<[[]<>](())>(<()[]>({}<>)))}>{<[<{{}{}}
+<<<[[(<[<<<{([{}[]]<[][]>){{(){}}[<>{}]}}><([{<><>}<[]()>]<[[]()]<{}{}>>)>>{(<[[(){}]](<<>()>[<><>]
+<<[<[<{[<[(<[<()[]>]{[{}[]][[]<>]}>)[{{[()()]{{}()}}{{<>}{{}<>}}}<{(()[]]{[]<>}}([<>()]<[]()>)>]]><{{<
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+[([[{<({(([[{{{}<>)[[]()]}(({}<>)[{}{}])]]<<{({}<>)(()())}>{[[(){}]({}[])]<{{}{}}>}>)<{([[
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+<{{<([<{[{({({<><>}({}()))<({}<>)<(){}>>}[(<(){}>[{}<>])<(<>[])([]())>])}[[{({()<>}({}<>)){(<>())<{}
+[[(<({{<(({[{<()[]>{()[]}}]<[<()[]>{<>[]}]{{()[]}[{}{}]}>}(({({}<>)[[]{}]}[[[]()](()<>}])({{{}{}}}
+({<<[[[<<[(<([()()]{(){}})>)]((([<()><(){}>]<{[]<>}[[]]>)<(<[]<>>(<>[]))>)({[(<><>)[<>]]{<()
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+([{{({{{[(<(({<>{}}<[]<>>))((<<><>>){<{}>{<><>}})><<[([][]){{}()}]([[]<>])><({()<>}[[]{}])<({
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+{[{<[([[[[({{[{}{}]{[]()}}<([][])[[][]]>}{({<>()}(<>[]))[({}<>)[<>{}]]})]]]{{{{[[[{}[]](()<>)][
\ No newline at end of file