Add solution for 13/1
Created by voroskoi on December 14, 2021
LX2QRWIOUHG4QM3LR5PGJQ3QSNL72W6HJML5FIQK24LZYP42FGOAC In channels
main
Change contents
File addition: 13
[1.0]File addition: main.go
[0.14]package mainimport ("bufio""log""os""strconv""strings")type coord struct {row, col int}type fold struct {direction bytevalue int}type manual struct {paper map[coord]boolfolds []fold}func main() {if err := myMain(); err != nil {log.Println(err)}}func myMain() error {m, err := parseInput("input.txt")if err != nil {return err}log.Println(len(solveFirst(m).paper))return nil}func solveFirst(m manual) manual {m.doFold(m.folds[0])return m}func (m manual) doFold(f fold) {switch f.direction {case 'y':for item := range m.paper {if item.row > f.value {delete(m.paper, item)m.paper[coord{f.value - (item.row - f.value), item.col}] = true}}case 'x':for item := range m.paper {if item.col > f.value {delete(m.paper, item)m.paper[coord{item.row, f.value - (item.col - f.value)}] = true}}default:panic("no way")}}func (m manual) String() string {rows, cols := 0, 0for item := range m.paper {if item.col > cols {cols = item.col}if item.row > rows {rows = item.row}}log.Println(cols, rows) // x, yret := strings.Builder{}ret.WriteByte('\n')for y := 0; y <= rows; y++ {for x := 0; x <= cols; x++ {if m.paper[coord{y, x}] {ret.WriteByte('#')} else {ret.WriteByte('.')}}ret.WriteByte('\n')}return ret.String()}func parseInput(fileName string) (manual, error) {var ret = manual{}ret.paper = map[coord]bool{}fd, err := os.Open(fileName)if err != nil {return ret, err}defer fd.Close()buf := bufio.NewScanner(fd)for buf.Scan() {if buf.Text() == "" {continue}tmp := strings.Split(buf.Text(), ",")if len(tmp) == 2 {crd := coord{}crd.col, err = strconv.Atoi(tmp[0])if err != nil {return ret, err}crd.row, err = strconv.Atoi(tmp[1])if err != nil {return ret, err}ret.paper[crd] = true} else { // parsing foldsfld := fold{}tmp := strings.TrimPrefix(buf.Text(), "fold along ")fld.direction = tmp[0]fld.value, err = strconv.Atoi(tmp[2:])if err != nil {return ret, err}ret.folds = append(ret.folds, fld)}}return ret, nil}File addition: input.txt
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along x=655fold along y=447fold along x=327fold along y=223fold along x=163fold along y=111fold along x=81fold along y=55fold along x=40fold along y=27fold along y=13fold along y=6File addition: input.test
[0.14]6,100,149,100,310,44,116,06,124,10,1310,123,43,08,41,102,148,109,0fold along y=7fold along x=5File addition: go.mod
[0.14]module maingo 1.17