Create 0442-find-all-duplicates-in-an-array.kt

Author: a93a

kotlin/0442-find-all-duplicates-in-an-array.kt

@@ -0,0 +1,13 @@
+class Solution {
+    fun findDuplicates(nums: IntArray): List<Int> {
+        val res = mutableListOf<Int> ()
+
+        for (n in nums) {
+            val n = if (n < 0) -n else n
+            if (nums[n - 1] < 0) res.add(n)
+            nums[n - 1] *= -1
+        }
+        
+        return res
+    }
+}