05 & 06 exercises (#114)

Co-authored-by: Aditya Bhargava <bluemangroupie@gmail.com>

06_breadth-first_search/kotlin/01_breadth-first_search.kt

@@ -0,0 +1,29 @@
+import java.util.*
+
+val graph = hashMapOf(
+	"You" to listOf("Sergey", "Viktoria"),
+	"Viktoria" to listOf("Sergey", "Vladimir"),
+	"Vladimir" to listOf("Sergey", "Andrew", "Nikita", "Boris")
+)
+
+private fun breadthFirstSearch(name: String) {
+	val queue = ArrayDeque(graph[name])
+	val searched = arrayListOf<String>()
+	while (queue.isNotEmpty()) {
+		val person = queue.poll()
+		if (!searched.contains(person)) {
+			if (personIsSeller(person)) {
+				println("$person is a mango seller!")
+				return
+			} else {
+				graph[person]?.let { queue.addAll(it) }
+				searched.add(person)
+			}
+		}
+	}
+	println("No mango sellers found!")
+}
+
+private fun personIsSeller(name: String): Boolean = name.endsWith("s")
+
+fun main(args: Array<String>) = println(breadthFirstSearch("You"))