kt: add «2560. House Robber IV»

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

kt/house-robber-iv.kt

@@ -0,0 +1,27 @@
+class Solution {
+    fun minCapability(
+        nums: IntArray,
+        k: Int,
+    ): Int {
+        var (min, max) = 1 to nums.max()!!
+
+        while (min < max) {
+            val mid = (min + max) / 2
+
+            val (_, possible) =
+                nums.fold(true to 0) { (canRob, robbed), reward ->
+                    when {
+                        canRob && reward <= mid -> false to (robbed + 1)
+                        else -> true to robbed
+                    }
+                }
+
+            when {
+                possible >= k -> max = mid
+                else -> min = mid + 1
+            }
+        }
+
+        return min
+    }
+}