Data commit

Task/Fibonacci-sequence/Kotlin/fibonacci-sequence.kotlin

@@ -0,0 +1,36 @@
+enum class Fibonacci {
+    ITERATIVE {
+        override fun get(n: Int): Long = if (n < 2) {
+            n.toLong()
+        } else {
+            var n1 = 0L
+            var n2 = 1L
+            repeat(n) {
+                val sum = n1 + n2
+                n1 = n2
+                n2 = sum
+            }
+            n1
+        }
+    },
+    RECURSIVE {
+        override fun get(n: Int): Long = if (n < 2) n.toLong() else this[n - 1] + this[n - 2]
+    },
+    CACHING {
+        val cache: MutableMap<Int, Long> = mutableMapOf(0 to 0L, 1 to 1L)
+        override fun get(n: Int): Long = if (n < 2) n.toLong() else impl(n)
+        private fun impl(n: Int): Long = cache.computeIfAbsent(n) { impl(it-1) + impl(it-2) }
+    },
+    ;
+
+    abstract operator fun get(n: Int): Long
+}
+
+fun main() {
+    val r = 0..30
+    for (fib in Fibonacci.values()) {
+        print("${fib.name.padEnd(10)}:")
+        for (i in r) { print(" " + fib[i]) }
+        println()
+    }
+}