Medium1663 challenge

Author: kkarpyshev

src/medium/1663. Smallest String With A Given Numeric Value .kt

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+package medium
+
+import GreedyTopic
+import StringTopic
+
+
+/**
+ * 1663. Smallest String With A Given Numeric Value
+ * https://leetcode.com/problems/smallest-string-with-a-given-numeric-value/
+ *
+The numeric value of a lowercase character is defined as its position (1-indexed) in the alphabet,
+so the numeric value of a is 1, the numeric value of b is 2, the numeric value of c is 3, and so on.
+
+The numeric value of a string consisting of lowercase characters is defined as the sum of its characters' numeric values.
+For example, the numeric value of the string "abe" is equal to 1 + 2 + 5 = 8.
+
+You are given two integers n and k. Return the lexicographically smallest string with length equal to n and numeric value equal to k.
+
+Note that a string x is lexicographically smaller than string y if x comes before y in dictionary order, that is,
+either x is a prefix of y, or if i is the first position such that x[i] != y[i], then x[i] comes before y[i] in alphabetic order.
+ */
+
+class Medium1663 : StringTopic, GreedyTopic {
+
+    fun getSmallestString(n: Int, k: Int): String {
+        val sb = StringBuilder()
+        var kk = k
+        for (i in n - 1 downTo 0) {
+            val rem = kk - 26 * i
+            if (rem <= 0) {
+                sb.append('a')
+                --kk
+            } else {
+                sb.append(('a'.toInt() + rem - 1).toChar())
+                kk -= rem
+            }
+        }
+        return sb.toString()
+    }
+}
+
+fun main() {
+    println(Medium1663().getSmallestString(3, 27))
+    println(Medium1663().getSmallestString(5, 73))
+}