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AoC2020
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Day15

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master
Karl Spickermann 3 years ago
parent f2e83bc7d2
commit 1cccb7132d
3 changed files with 92 additions and 14 deletions
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38
.idea/workspace.xml
Unescape View File

@ -11,10 +11,9 @@
</component>
<component name="ChangeListManager">
<list default="true" id="400bdf61-8921-41d3-8f98-a0a1b0877f46" name="Default Changelist" comment="">
<change afterPath="$PROJECT_DIR$/day14/day14.go" afterDir="false" />
<change afterPath="$PROJECT_DIR$/day14/day14Test.txt" afterDir="false" />
<change afterPath="$PROJECT_DIR$/day14/day14Test2.txt" afterDir="false" />
<change afterPath="$PROJECT_DIR$/day15/day15.go" afterDir="false" />
<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
<change beforePath="$PROJECT_DIR$/helper/helper.go" beforeDir="false" afterPath="$PROJECT_DIR$/helper/helper.go" afterDir="false" />
</list>
<option name="SHOW_DIALOG" value="false" />
<option name="HIGHLIGHT_CONFLICTS" value="true" />
@ -55,7 +54,7 @@
<recent name="C:\Users\karls\go\src\AoC2020" />
</key>
</component>
<component name="RunManager" selected="Go Build.go build day14.go">
<component name="RunManager" selected="Go Build.go build day15.go">
<configuration name="go build day10.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
<module name="AoC2020" />
<working_directory value="$PROJECT_DIR$/day10" />
@ -106,6 +105,15 @@
<directory value="$PROJECT_DIR$" />
<method v="2" />
</configuration>
<configuration name="go build day15.go" type="GoApplicationRunConfiguration" factoryName="Go Application" temporary="true" nameIsGenerated="true">
<module name="AoC2020" />
<working_directory value="$PROJECT_DIR$" />
<kind value="FILE" />
<filePath value="$PROJECT_DIR$/day15/day15.go" />
<package value="AoC2020" />
<directory value="$PROJECT_DIR$" />
<method v="2" />
</configuration>
<configuration name="go build day1.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
<module name="AoC2020" />
<working_directory value="$PROJECT_DIR$/day1" />
@ -224,9 +232,11 @@
<item itemvalue="Go Build.go build day12.go" />
<item itemvalue="Go Build.go build day13.go" />
<item itemvalue="Go Build.go build day14.go" />
<item itemvalue="Go Build.go build day15.go" />
</list>
<recent_temporary>
<list>
<item itemvalue="Go Build.go build day15.go" />
<item itemvalue="Go Build.go build day1.go" />
</list>
</recent_temporary>
@ -261,26 +271,26 @@
<screen x="0" y="0" width="1920" height="1040" />
</state>
<state x="739" y="287" key="FileChooserDialogImpl/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607278759015" />
<state width="1877" height="386" key="GridCell.Tab.0.bottom" timestamp="1607962571043">
<state width="1877" height="386" key="GridCell.Tab.0.bottom" timestamp="1608046616194">
<screen x="0" y="0" width="1920" height="1040" />
</state>
<state width="1877" height="386" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629475" />
<state width="1877" height="386" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607962571043" />
<state width="1877" height="386" key="GridCell.Tab.0.center" timestamp="1607962571042">
<state width="1877" height="386" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1608046616194" />
<state width="1877" height="386" key="GridCell.Tab.0.center" timestamp="1608046616194">
<screen x="0" y="0" width="1920" height="1040" />
</state>
<state width="1877" height="386" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629474" />
<state width="1877" height="386" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607962571042" />
<state width="1877" height="386" key="GridCell.Tab.0.left" timestamp="1607962571042">
<state width="1877" height="386" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1608046616194" />
<state width="1877" height="386" key="GridCell.Tab.0.left" timestamp="1608046616194">
<screen x="0" y="0" width="1920" height="1040" />
</state>
<state width="1877" height="386" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629474" />
<state width="1877" height="386" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607962571042" />
<state width="1877" height="386" key="GridCell.Tab.0.right" timestamp="1607962571042">
<state width="1877" height="386" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1608046616194" />
<state width="1877" height="386" key="GridCell.Tab.0.right" timestamp="1608046616194">
<screen x="0" y="0" width="1920" height="1040" />
</state>
<state width="1877" height="386" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629475" />
<state width="1877" height="386" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607962571042" />
<state width="1877" height="386" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1608046616194" />
<state x="782" y="240" key="RollbackChangesDialog" timestamp="1607174263188">
<screen x="0" y="0" width="1920" height="1040" />
</state>
@ -301,9 +311,9 @@
<screen x="0" y="0" width="1920" height="1040" />
</state>
<state x="593" y="141" width="585" height="801" key="find.popup/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607700424475" />
<state x="623" y="225" width="672" height="678" key="search.everywhere.popup" timestamp="1607081728725">
<state x="623" y="225" width="672" height="678" key="search.everywhere.popup" timestamp="1608045273455">
<screen x="0" y="0" width="1920" height="1040" />
</state>
<state x="623" y="225" width="672" height="678" key="search.everywhere.popup/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607081728725" />
<state x="623" y="225" width="672" height="678" key="search.everywhere.popup/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1608045273455" />
</component>
</project>

59
day15/day15.go
Unescape View File

@ -0,0 +1,59 @@
package main
import "fmt"
func main() {
fmt.Println(run([]int{5,1,9,18,13,8,0}, 2020))
fmt.Println(runPart2([]int{5,1,9,18,13,8,0}, 30000000))
}
func run(startingNumber []int, length int) int{
var band []int
band = append(band, startingNumber...)
for i := len(startingNumber); i < length; i++ {
currentNumber := band[i-1]
index := findIndex(currentNumber,band)
if index == -1 {
band = append(band, 0)
}else {
band = append(band, i-1-index)
}
}
return band[len(band)-1]
}
func runPart2(startingNumber []int, length int) int{
var band = make (map[int][]int)
for i, val := range startingNumber {
band[val] = []int{i,i}
}
lastNumber := startingNumber[len(startingNumber)-1]
for i := len(startingNumber); i < length; i++ {
currentNumber := lastNumber
indexes := band[currentNumber]
diffIndexes := indexes[1]-indexes[0]
if diffIndexes == 0 {
lastNumber = 0
band[0] = []int{band[0][1],i}
}else {
lastNumber = diffIndexes
if len(band[diffIndexes]) != 0 {
band[diffIndexes] = []int{band[diffIndexes][1],i}
}else {
band[diffIndexes] = []int{i,i}
}
}
}
return lastNumber
}
func findIndex(number int, band []int) int{
for i := len(band)-2; i >= 0; i-- {
if band[i] == number {
return i
}
}
return -1
}

9
helper/helper.go
Unescape View File

@ -56,3 +56,12 @@ func FindAddendsForSum (possibleAddends []int, sum int) (int, int, error) {
}
return 0,0,errors.New("No fitting Addends found")
}
func SliceIndex(limit int, predicate func(i int) bool) int {
for i := 0; i < limit; i++ {
if predicate(i) {
return i
}
}
return -1
}
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