[Week4](gmlwls96) Missing number

Author: gmlwls96

missing-number/gmlwls96.kt

@@ -0,0 +1,13 @@
+class Solution {
+    fun missingNumber(nums: IntArray): Int {
+        nums.sort()
+        var num = nums[0]
+        for (i in 1 until nums.size) {
+            if (nums[i] != (num + 1)) {
+                return num + 1
+            }
+            num = nums[i]
+        }
+        return num + 1
+    }
+}