Data commit

Task/Roman-numerals-Encode/Kotlin/roman-numerals-encode-1.kotlin

@@ -0,0 +1,36 @@
+val romanNumerals = mapOf(
+    1000 to "M",
+    900 to "CM",
+    500 to "D",
+    400 to "CD",
+    100 to "C",
+    90 to "XC",
+    50 to "L",
+    40 to "XL",
+    10 to "X",
+    9 to "IX",
+    5 to "V",
+    4 to "IV",
+    1 to "I"
+)
+
+fun encode(number: Int): String? {
+    if (number > 5000 || number < 1) {
+        return null
+    }
+    var num = number
+    var result = ""
+    for ((multiple, numeral) in romanNumerals.entries) {
+        while (num >= multiple) {
+            num -= multiple
+            result += numeral
+        }
+    }
+    return result
+}
+
+fun main(args: Array<String>) {
+    println(encode(1990))
+    println(encode(1666))
+    println(encode(2008))
+}

Task/Roman-numerals-Encode/Kotlin/roman-numerals-encode-2.kotlin

@@ -0,0 +1,19 @@
+fun Int.toRomanNumeral(): String {
+    fun digit(k: Int, unit: String, five: String, ten: String): String {
+        return when (k) {
+            in 1..3 -> unit.repeat(k)
+            4 -> unit + five
+            in 5..8 -> five + unit.repeat(k - 5)
+            9 -> unit + ten
+            else -> throw IllegalArgumentException("$k not in range 1..9")
+        }
+    }
+    return when (this) {
+        0 -> ""
+        in 1..9 -> digit(this, "I", "V", "X")
+        in 10..99 -> digit(this / 10, "X", "L", "C") + (this % 10).toRomanNumeral()
+        in 100..999 -> digit(this / 100, "C", "D", "M") + (this % 100).toRomanNumeral()
+        in 1000..3999 -> "M" + (this - 1000).toRomanNumeral()
+        else -> throw IllegalArgumentException("${this} not in range 0..3999")
+    }
+}