kt: add «452. Minimum Number of Arrows to Burst Balloons»

URL:	https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons/
Signed-off-by: Matej Focko <me@mfocko.xyz>

kt/minimum-number-of-arrows-to-burst-balloons.kt

@@ -0,0 +1,19 @@
+class Solution {
+    fun findMinArrowShots(points: Array<IntArray>): Int {
+        points.sortBy { it[0] }
+
+        var usedArrows = 1
+        points.drop(1).fold(points[0][1]) { maxX, it ->
+            when {
+                it[0] <= maxX -> listOf(maxX, it[1]).min()
+                else -> {
+                    usedArrows++
+
+                    it[1]
+                }
+            }
+        }
+
+        return usedArrows
+    }
+}