kt: add «2460. Apply Operations to an Array»

URL:	https://leetcode.com/problems/apply-operations-to-an-array/
Signed-off-by: Matej Focko <me@mfocko.xyz>

kt/apply-operations-to-an-array.kt

@@ -0,0 +1,28 @@
+class Solution {
+    fun applyOperations(nums: IntArray): IntArray {
+        val n = nums.size
+
+        var nonZero = 0
+        nums.indices.forEach { i ->
+            if (i < n - 1 && nums[i] != 0 && nums[i] == nums[i + 1]) {
+                nums[i] *= 2
+                nums[i + 1] = 0
+            }
+
+            if (nums[i] == 0) {
+                return@forEach
+            }
+
+            if (i != nonZero) {
+                (nums[nonZero] to nums[i]).let { (x, y) ->
+                    nums[i] = x
+                    nums[nonZero] = y
+                }
+            }
+
+            nonZero++
+        }
+
+        return nums
+    }
+}