kt: add «198. House Robber»

URL:	https://leetcode.com/problems/house-robber/
Signed-off-by: Matej Focko <me@mfocko.xyz>

kt/house-robber.kt

@@ -0,0 +1,23 @@
+class Solution {
+    private fun get(
+        nums: IntArray,
+        i: Int,
+    ): Int =
+        when {
+            i < 0 -> 0
+            i >= nums.size -> 0
+            else -> nums[i]
+        }
+
+    fun rob(nums: IntArray): Int =
+        when (nums.size) {
+            0 -> 0
+            else -> {
+                nums.indices.drop(1).forEach { i ->
+                    nums[i] = listOf(nums[i - 1], get(nums, i - 2) + nums[i]).max()
+                }
+
+                nums.last()
+            }
+        }
+}