8000 day 8 part 1 seems to work on example values · jamesjarvis/adventofcode@4660b44 · GitHub
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jamesjarvisjamesjarvis
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day 8 part 1 seems to work on example values
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‎08/go.mod

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module github.com/jamesjarvis/adventofcode/08
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go 1.17

‎08/input.txt

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be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe
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edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
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fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
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fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
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aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
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fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
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dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
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bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
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egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
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gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce

‎08/main.go

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package main
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import (
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_ "embed"
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"fmt"
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"strings"
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)
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//go:embed input.txt
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var input string
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var digitsUnderTest = map[int]struct{}{
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1: {},
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4: {},
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7: {},
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8: {},
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}
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func main() {
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if input == "" {
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panic("input cannot be empty")
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}
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problems := []*Problem{}
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inputstrarr := strings.Split(input, "\n")
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for _, line := range inputstrarr {
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lineSplit := strings.Split(line, " | ")
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segmentValues := strings.Split(lineSplit[0], " ")
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testValues := strings.Split(lineSplit[1], " ")
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p := &Problem{
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segmentValues: segmentValues,
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testValues: testValues,
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}
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// fmt.Printf("%+v\n", p)
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problems = append(problems, p)
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}
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world := &World{
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problems: problems,
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}
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HowManyTimesDoDigitsAppear := world.HowManyTimesDoDigitsAppear(digitsUnderTest)
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fmt.Printf("Answer: %d\n", HowManyTimesDoDigitsAppear)
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}
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type World struct {
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problems []*Problem
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}
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func (w *World) HowManyTimesDoDigitsAppear(digits map[int]struct{}) (count int) {
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for _, p := range w.problems {
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for _, test := range p.testValues {
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val := p.WhatIsSegmentValue(test)
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// fmt.Printf("%s = %d\n", test, val)
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if _, ok := digits[val]; ok {
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count++
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}
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}
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}
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return count
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}
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type Problem struct {
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segmentValues []string
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testValues []string
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}
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func (p *Problem) WhatIsSegmentValue(testValue string) int {
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// A simple test for getting values 1,4,7,8 is to check length
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// as the number of segments is unique for these values.
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switch len(testValue) {
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case 2:
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return 1
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case 4:
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return 4
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case 3:
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return 7
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case 7:
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return 8
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}
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return 0
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}

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