Merge pull request devcordde#36 from NyCodeGHG/master

Kotlin solution for day 6

Author: JohnnyJayJay

Day-06/kotlin/.gitignore

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+*.txt

Day-06/kotlin/README.md

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+# Kotlin Solution
+I recommend to use [kscript](https://github.com/holgerbrandl/kscript) by [@holgerbrandl](https://github.com/holgerbrandl) to execute the script file.

Day-06/kotlin/solution.kts

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+import java.nio.file.Files
+import java.nio.file.Paths
+
+val answers = ArrayList<Answer>()
+
+var answer = Answer()
+val lines = Files.readAllLines(Paths.get("input.txt"))
+
+var index = 0
+var lastLineCount = 0
+
+while (index < lines.size) {
+ val line = lines[index]
+
+ if (line.isBlank()) {
+ index++
+ continue
+ }
+
+ answer.people = ++lastLineCount
+ answer.questions.addAll(line.toCharArray().toMutableSet())
+
+ if (++index < lines.size) {
+ if (lines[index].isBlank()) {
+ answers.add(answer)
+ answer = Answer()
+ lastLineCount = 0
+ }
+ } else {
+ answers.add(answer)
+ answer = Answer()
+ lastLineCount = 0
+ }
+}
+
+println(answers.map { it.questions.size }.sum())
+
+val groups = ArrayList<Group>()
+var group = Group()
+index = 0
+lastLineCount = 0
+
+while (index < lines.size) {
+ val line = lines[index]
+
+ if (line.isBlank()) {
+ index++
+ continue
+ }
+
+ group.answers.put(++lastLineCount, Answer(line.toCharArray().toMutableSet(), lastLineCount))
+
+ if (++index < lines.size) {
+ if (lines[index].isBlank()) {
+ groups.add(group)
+ group = Group()
+ lastLineCount = 0
+ }
+ } else {
+ groups.add(group)
+ group = Group()
+ lastLineCount = 0
+ }
+}
+
+println(groups.map { aGroup ->
+ val questions = aGroup.answers.map { it.value.questions }.flatten().toMutableSet()
+ questions.removeIf { char ->
+ aGroup.answers.filter { !it.value.questions.contains(char) }.isNotEmpty()
+ }
+ questions.size
+}.sum())
+
+data class Group(val answers: MutableMap<Int, Answer> = mutableMapOf())
+
+data class Answer(val questions: MutableSet<Char> = mutableSetOf<Char>(), var people: Int = 0)