github.com/agrigoryan/aoc_2023_go@v0.0.0-20231216221323-4ace361ec685/day4/d4p1.go (about)

     1  package day4
     2  
     3  import (
     4  	"fmt"
     5  	"slices"
     6  	"strings"
     7  
     8  	"github.com/agrigoryan/aoc_2023_go/aocutils"
     9  )
    10  
    11  func d4p1(input string) int {
    12  	sum := 0
    13  
    14  	trimSpaces := aocutils.Mapper(func(str string) string { return strings.TrimSpace(str) })
    15  	filterEmpty := aocutils.Filterer(func(str string) bool { return len(str) > 0 })
    16  
    17  	for _, line := range strings.Split(input, "\n") {
    18  		ticket := strings.Split(line, ":")[1]
    19  		parts := strings.Split(ticket, "|")
    20  		winningNumbers := filterEmpty(trimSpaces(strings.Split(parts[0], " ")))
    21  		numbers := filterEmpty(trimSpaces(strings.Split(parts[1], " ")))
    22  		matches := 0
    23  		for _, num := range numbers {
    24  			if slices.Contains(winningNumbers, num) {
    25  				matches += 1
    26  			}
    27  		}
    28  		if matches > 0 {
    29  			worth := 1 << (matches - 1)
    30  			sum += worth
    31  		}
    32  	}
    33  	fmt.Println(sum)
    34  	return sum
    35  }