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solve day 3
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4 changed files with 310 additions and 0 deletions
135
2023/day03_engine.go
Normal file
135
2023/day03_engine.go
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package _023
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import (
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"bufio"
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"fmt"
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"io"
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"regexp"
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"slices"
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"strconv"
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)
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type Day03Number struct {
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lineNo int
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start int
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end int
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value int
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}
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type Day03Symbol struct {
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row, col int
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}
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func Day03Part1(input io.Reader) (int, error) {
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numberReg := regexp.MustCompile(`\d+`)
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symbolReg := regexp.MustCompile(`[^\d.]`)
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scanner := bufio.NewScanner(input)
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var symbols []Day03Symbol
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var numbers []Day03Number
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lineNo := 0
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width := 0
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for scanner.Scan() {
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line := scanner.Text()
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width = len(line)
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lineNumbers := numberReg.FindAllStringIndex(line, -1)
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lineSymbols := symbolReg.FindAllStringIndex(line, -1)
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for _, symbol := range lineSymbols {
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symbols = append(symbols, Day03Symbol{lineNo, symbol[0]})
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}
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for _, number := range lineNumbers {
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value, err := strconv.Atoi(line[number[0]:number[1]])
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if err != nil {
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return 0, fmt.Errorf("parsing number: %w", err)
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}
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numbers = append(numbers, Day03Number{lineNo, number[0], number[1], value})
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}
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lineNo++
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}
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sum := 0
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for _, number := range numbers {
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if isAdjacent(number, symbols, lineNo, width) {
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sum += number.value
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}
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}
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return sum, nil
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}
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func isAdjacent(number Day03Number, symbols []Day03Symbol, height, width int) bool {
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minRow := max(number.lineNo-1, 0)
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maxRow := min(number.lineNo+1, height)
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minCol := max(number.start-1, 0)
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maxCol := min(number.end, width)
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for row := minRow; row <= maxRow; row++ {
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for col := minCol; col <= maxCol; col++ {
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if slices.Contains(symbols, Day03Symbol{row, col}) {
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return true
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}
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}
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}
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return false
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}
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func Day03Part2(input io.Reader) (int, error) {
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numberReg := regexp.MustCompile(`\d+`)
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symbolReg := regexp.MustCompile(`\*`)
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scanner := bufio.NewScanner(input)
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var (
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potentialGears []Day03Symbol
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numbers []Day03Number
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)
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lineNo := 0
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width := 0
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for scanner.Scan() {
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line := scanner.Text()
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width = len(line)
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lineNumbers := numberReg.FindAllStringIndex(line, -1)
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lineSymbols := symbolReg.FindAllStringIndex(line, -1)
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for _, symbol := range lineSymbols {
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potentialGears = append(potentialGears, Day03Symbol{lineNo, symbol[0]})
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}
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for _, number := range lineNumbers {
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value, err := strconv.Atoi(line[number[0]:number[1]])
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if err != nil {
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return 0, fmt.Errorf("parsing number: %w", err)
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}
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numbers = append(numbers, Day03Number{lineNo, number[0], number[1], value})
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}
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lineNo++
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}
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sum := 0
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for _, potentialGear := range potentialGears {
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sum += gearRatio(potentialGear, numbers, lineNo, width)
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}
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return sum, nil
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}
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func gearRatio(gear Day03Symbol, numbers []Day03Number, height int, width int) int {
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minRow := max(gear.row-1, 0)
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maxRow := min(gear.row+1, height)
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minCol := max(gear.col-1, 0)
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maxCol := min(gear.col+1, width)
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var ratio []int
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for row := minRow; row <= maxRow; row++ {
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for col := minCol; col <= maxCol; col++ {
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for _, number := range numbers {
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if row == number.lineNo && col >= number.start && col < number.end {
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ratio = append(ratio, number.value)
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col = number.end
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}
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}
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}
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}
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if len(ratio) != 2 {
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return 0
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}
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return ratio[0] * ratio[1]
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}
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25
2023/day03_engine_test.go
Normal file
25
2023/day03_engine_test.go
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package _023
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import (
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"testing"
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)
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func TestDay03Part1(t *testing.T) {
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tests := []testCase{
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{"inputs/day03_test1", 4361},
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{"inputs/day03", 529618},
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}
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for _, test := range tests {
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t.Run(test.filename, check(test, Day03Part1))
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}
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}
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func TestDay03Part2(t *testing.T) {
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tests := []testCase{
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{"inputs/day03_test1", 467835},
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{"inputs/day03", 77509019},
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}
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for _, test := range tests {
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t.Run(test.filename, check(test, Day03Part2))
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}
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}
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140
2023/inputs/day03
Normal file
140
2023/inputs/day03
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@ -0,0 +1,140 @@
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........................617.........123...........341.........................293..................38..19.753..................533..........
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|
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|
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|
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|
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|
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|
||||
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|
||||
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|
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|
||||
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|
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|
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
........$.....*....*........617.........712.......*..............122...237............491........../452..............445.......#.342...@....
|
||||
........903.422....854.643...*......942...*.......334................................*.......855*..........507....................@.........
|
||||
.326...................*....426.838.*.....948...................868...635....635.....401.........810.........#........887...40.......743....
|
||||
............879......889..#.........252.............496....*...........#..........55........370..................39..$.....*....331..*......
|
||||
..506......&...............487..............794....*.....55.................262.....*..465..*.............309......=.......460...*..431.....
|
||||
.....#............................*......41.........911........./.495.....................*.241..........*....509.....314.......329.........
|
||||
...............627....15.706...277.276........................68.............*.........................491.......*........#898......%956....
|
||||
...........830....*12..*....*.................219.112......................952.....637*........-..539..........999.316.2..........%.........
|
||||
....../.......*.......132..577.595......426..*......*.3....#380.......681+...............460..829.*..................=.....223.....615......
|
||||
......726...811...........................+..91..980..*........................$..........*.......639..................193.%............403.
|
||||
...................358*............633................526....266.........666...534.....662........................+.....$.........758...*...
|
||||
.......=.......137.....313.........=.............998......&....*..........*.....................559..313..825=.....353....405.........296...
|
||||
....447...........#...........342....%.....%........*..938......238.....327..............*152......@...*...................%..472.153.......
|
||||
.............152#............*......792...334......741........................570*....335..............137..........338..........*......+...
|
||||
952.........................................................793......583..........623............11........730............50.116.........446
|
||||
10
2023/inputs/day03_test1
Normal file
10
2023/inputs/day03_test1
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
467..114..
|
||||
...*......
|
||||
..35..633.
|
||||
......#...
|
||||
617*......
|
||||
.....+.58.
|
||||
..592.....
|
||||
......755.
|
||||
...$.*....
|
||||
.664.598..
|
||||
Loading…
Reference in a new issue