123 lines
2.4 KiB
Go
123 lines
2.4 KiB
Go
package main
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import (
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"strconv"
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"strings"
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"github.com/jpillora/puzzler/harness/aoc"
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)
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func main() {
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aoc.Harness(run)
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}
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// on code change, run will be executed 4 times:
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// 1. with: false (part1), and example input
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// 2. with: true (part2), and example input
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// 3. with: false (part1), and user input
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// 4. with: true (part2), and user input
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// the return value of each run is printed to stdout
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func run(part2 bool, input string) any {
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// when you're ready to do part 2, remove this "not implemented" block
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if part2 {
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return "not implemented"
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}
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// solve part 1 here
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sum := 0
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for _, l := range strings.Split(input, "\n") {
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if l == "" {
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continue
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}
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spl := strings.Split(l, " ")
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combo := make([]int, 0)
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for _, c := range strings.Split(spl[1], ",") {
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ci, _ := strconv.Atoi(c)
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combo = append(combo, ci)
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}
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//fmt.Printf("\nLooking in %v %v\n", spl[0], combo)
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poss := iteratePossibilities(spl[0], combo)
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//fmt.Printf("In %v %v: %v\n", spl[0], combo, poss)
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sum += poss
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}
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return sum
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}
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func iteratePossibilities(springs string, combo []int) int {
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if len(combo) == 0 {
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panic("Combo is empty")
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}
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lenMatch := combo[0]
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if len(springs) < lenMatch {
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// Cannot match, not enough space
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return 0
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}
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p := 0
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for i := 0; i < len(springs)-lenMatch+1; i++ {
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match := true
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forceMatch := false
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for m := i; m < i+lenMatch; m++ {
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if rune(springs[m]) == '.' {
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match = false
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}
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if rune(springs[m]) == '#' && i == m {
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forceMatch = true
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}
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}
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if !match {
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// Keep trying
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if forceMatch {
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break
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}
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continue
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}
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matchFrom := i + lenMatch
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if len(springs) > i+lenMatch {
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if rune(springs[i+lenMatch]) == '#' {
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// Would be contigious, does not work
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if forceMatch {
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break
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}
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continue
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}
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matchFrom += 1
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}
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// Cool! We are matched!
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if len(combo) == 1 {
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// Check, finally, that there are no possible # in the future (which would violate the requirements)
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anyFuture := false
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for j := matchFrom; j < len(springs); j++ {
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if rune(springs[j]) == '#' {
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anyFuture = true
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}
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}
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if !anyFuture {
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//fmt.Printf("MATCHED %v in %v from [%v;%v)\n", lenMatch, springs, i, i+lenMatch-1)
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p += 1
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}
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} else {
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//fmt.Printf("Matched %v in %v from [%v;%v)\n", lenMatch, springs, i, i+lenMatch-1)
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p += iteratePossibilities(springs[matchFrom:], combo[1:])
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}
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if forceMatch {
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break
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}
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}
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return p
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}
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