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day_nine.go
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day_nine.go
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package advent
import (
"fmt"
"regexp"
)
type marble struct {
value int
next *marble
prev *marble
}
// MarbleMania is Elf play area
func MarbleMania() {
fmt.Println("--- Marble Mania ---")
input := ""
// input = "10 players; last marble is worth 1618 points"
// input = "13 players; last marble is worth 7999 points"
// input = "17 players; last marble is worth 1104 points"
// input = "21 players; last marble is worth 6111 points"
// input = "30 players; last marble is worth 5807 points"
input = "430 players; last marble is worth 7158800 points" //3412522480
// input = "9 players; last marble is worth 25 points"
var pattern = "(?P<players>[0-9]*) players; last marble is worth (?P<marbles>[0-9]*) points"
matches := regexp.MustCompile(pattern).FindStringSubmatch(input)
nosPlayers := ConvInt(matches[1])
nosMarbles := ConvInt(matches[2])
// fmt.Println("# of players =", nosPlayers, ", # of marbles =", nosMarbles)
// playerScoreMap := getElfScores(nosPlayers, nosMarbles)
playerScoreMap := getElfScoresCLL(nosPlayers, nosMarbles)
//fmt.Println(playerScoreMap)
fmt.Println("max score =", getMaxScore(playerScoreMap))
}
func getElfScoresCLL(nosPlayers, nosMarbles int) map[int]int {
fmt.Println("# of players =", nosPlayers, ", # of marbles =", nosMarbles)
playerScoreMap := make(map[int]int)
player := 0
header := &marble{value: 0}
nextElem := &marble{value: 1}
header.next = nextElem
header.prev = nextElem
nextElem.next = header
nextElem.prev = header
// updating header
for currentMarble := 2; currentMarble <= nosMarbles; currentMarble++ {
player = (player + 1) % nosPlayers
if currentMarble%23 == 0 {
playerScoreMap[player] += currentMarble
for i := 0; i < 7; i++ {
header = header.prev
}
playerScoreMap[player] += header.value
removeNode := header
removeNode.next.prev = removeNode.prev
removeNode.prev.next = removeNode.next
header = removeNode.next
} else {
newNode := &marble{value: currentMarble,
next: header.next.next, // to jump two nodes
prev: header.next}
newNode.prev.next = newNode
newNode.next.prev = newNode
header = newNode
}
}
return playerScoreMap
}
func print(header *marble) {
temp := header.next
for i := 0; temp != header; i++ {
fmt.Print(temp.value, ", ")
temp = temp.next
}
fmt.Print(temp.value, "\n")
}
func getMaxScore(playerScoreMap map[int]int) int {
max := 0
for _, score := range playerScoreMap {
if max < score {
max = score
}
}
return max
}
func getElfScores(nosPlayers, nosMarbles int) map[int]int {
playerScoreMap := make(map[int]int)
marbleList := []int{0}
placeIndex := 1
player := -1
for i := 1; i <= nosMarbles; i++ {
player = (player + 1) % nosPlayers
if i%23 == 0 {
playerScoreMap[player] += i
// currentIndex := (placeIndex - 7 - 2) % len(marbleList)
currentIndex := (placeIndex - 7 - 2)
if currentIndex < 0 {
currentIndex = len(marbleList) + currentIndex
}
// fmt.Println("placeIndex =", placeIndex)
playerScoreMap[player] += marbleList[currentIndex]
marbleList = RemoveAtIndex(marbleList, currentIndex)
placeIndex = currentIndex
} else {
marbleList = AppendAtIndex(marbleList, placeIndex, i)
}
placeIndex += 2
if len(marbleList) == placeIndex && ((len(marbleList) % 2) == 0) {
//fmt.Println("placeIndex =", placeIndex)
placeIndex = 0
} else if len(marbleList) < placeIndex {
placeIndex = 1
//placeIndex % (len(marbleList))
}
// fmt.Println("Player #", player, "-", marbleList)
}
return playerScoreMap
}