mirror of
https://github.com/onyx-and-iris/aoc2023.git
synced 2024-11-15 15:10:49 +00:00
74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
package main
|
|
|
|
import (
|
|
"bufio"
|
|
"log"
|
|
"math"
|
|
"os"
|
|
"regexp"
|
|
"strconv"
|
|
)
|
|
|
|
// readlines reads lines from stdin.
|
|
// it returns them as an array of strings
|
|
func readlines() []string {
|
|
lines := []string{}
|
|
|
|
scanner := bufio.NewScanner(os.Stdin)
|
|
for scanner.Scan() {
|
|
lines = append(lines, scanner.Text())
|
|
}
|
|
|
|
if err := scanner.Err(); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
return lines
|
|
}
|
|
|
|
func getParams(rexp *regexp.Regexp, url string) map[string]string {
|
|
match := rexp.FindStringSubmatch(url)
|
|
|
|
m := make(map[string]string)
|
|
for i, name := range rexp.SubexpNames() {
|
|
if i > 0 && i <= len(match) {
|
|
m[name] = match[i]
|
|
}
|
|
}
|
|
return m
|
|
}
|
|
|
|
// mustConv converts string to int
|
|
// it will panic if an error occurs
|
|
func mustConv(s string) int {
|
|
n, err := strconv.Atoi(s)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return n
|
|
}
|
|
|
|
// mustConvHex converts a hex string to int
|
|
// it will panic if an error occurs
|
|
func mustConvHex(s string) int {
|
|
n, err := strconv.ParseInt(s, 16, 64)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return int(n)
|
|
}
|
|
|
|
// calculateArea returns the area of the polygon described by imager.space
|
|
func calculateArea(space []coords) int {
|
|
area := 0
|
|
for i := 0; i < len(space); i++ {
|
|
next := space[(i+1)%len(space)]
|
|
area += space[i].X*next.Y - space[i].Y*next.X
|
|
}
|
|
|
|
// add perimeter to area within perimeter
|
|
area = len(space) + (int(math.Abs(float64(area))) / 2)
|
|
|
|
return area - len(space)/2 + 1
|
|
}
|