day 10a complete

first time using a stack, can recommend

day10/day 10a/go.mod

@@ -0,0 +1,3 @@
+module PWD
+
+go 1.17

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
+}

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
+}

day10/day 10a/testInput

@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]