efim
/
Advent-of-Code-2023
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

day12, part2

This commit is contained in:
efim 2023-12-13 02:41:08 +00:00
parent 6398a4d468
commit 4d346a23db
1 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
day12/dayTwelve.go
View File

@ -55,7 +55,8 @@ func Run() int {
blockLengthSum += blockLen
}
variantsCount := generatePermutations("", len(mask), blockLengs, blockLengthSum, mask)
memo := make(map[string]int)
variantsCount := generatePermutations("", len(mask), blockLengs, blockLengthSum, mask, memo)
log.Printf("%d : for line %s blocks %+v matches %d\n", lineNum, mask, blockLengs, variantsCount)
matches <- variantsCount
@ -115,7 +116,14 @@ func ReadLine(line string) (string, []int) {
return mask, blockLengs
}
func generatePermutations(curString string, targetLength int, blockLengths []int, blockLengthsSum int, mask string) int {
func generatePermutations(curString string, targetLength int, blockLengths []int, blockLengthsSum int, mask string, memo map[string]int) int {
memoKey := fmt.Sprintf("%+v|%d", blockLengths, len(curString))
memoized, memoFound := memo[memoKey]
if memoFound {
return memoized
}
// fmt.Printf("> entering with \n%s\nfor map \n%s\n\n", curString, mask)
// time.Sleep(time.Second)
if !isVariantMatchesMask(curString, mask) {
@ -131,6 +139,7 @@ func generatePermutations(curString string, targetLength int, blockLengths []int
if !isVariantMatchesMask(variant, mask) {
return 0
}
memo[memoKey] = 1
return 1
}
@ -150,9 +159,10 @@ func generatePermutations(curString string, targetLength int, blockLengths []int
whenPass := curString + "."
whenAdd := curString + strings.Repeat("#", nextBlock) + strings.Repeat(".", rightPointRepeat)
passCount := generatePermutations(whenPass, targetLength, blockLengths, blockLengthsSum, mask)
addCount := generatePermutations(whenAdd, targetLength, restBlocks, blockLengthsSum-nextBlock, mask)
passCount := generatePermutations(whenPass, targetLength, blockLengths, blockLengthsSum, mask, memo)
addCount := generatePermutations(whenAdd, targetLength, restBlocks, blockLengthsSum-nextBlock, mask, memo)
memo[memoKey] = passCount + addCount
return passCount + addCount
}