AdventOfCode2021/day10/10b/main.go

114 lines
2.1 KiB
Go
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package main
import (
"bufio"
"fmt"
"os"
)
func main() {
content := returnContent("../input")
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//content := returnContent("../testInput")
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var bracketMap map[byte]byte = make(map[byte]byte)
var reverseBracketMap map[byte]byte = make(map[byte]byte)
var bracketCost map[byte]int = make(map[byte]int)
bracketMap[')'] = '('
bracketMap[']'] = '['
bracketMap['}'] = '{'
bracketMap['>'] = '<'
reverseBracketMap['('] = ')'
reverseBracketMap['['] = ']'
reverseBracketMap['{'] = '}'
reverseBracketMap['<'] = '>'
bracketCost[')'] = 1
bracketCost[']'] = 2
bracketCost['}'] = 3
bracketCost['>'] = 4
//reduce list to required incomplete set
stackList := []Stack{}
autoCompletes := []int{}
for _, row := range *content {
stack := Stack{}
keep := true
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 {
keep = false
// *content = *removeElement(content, i)
break
}
}
}
if keep {
stackList = append(stackList, stack)
}
}
emptyStackNode := StackNode{}
for _, stack := range stackList {
autocomplete := 0
for *(stack.Peek()) != emptyStackNode {
autocomplete *= 5
autocomplete += bracketCost[reverseBracketMap[stack.Pop()]]
}
autoCompletes = append(autoCompletes, autocomplete)
}
autoCompletes = mergeSort(autoCompletes, 0, len(autoCompletes)-1)
mid := autoCompletes[len(autoCompletes)/2]
fmt.Println(mid)
}
// func removeElement(slice *[][]byte, i int) (new *[][]byte) {
// new = &[][]byte{}
// for j, row := range *slice {
// if i != j {
// *new = append(*new, row)
// }
// }
// return
// }
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
}