problems(swift): add “1464. Maximum Product of Two Elements in an Array”

Signed-off-by: Matej Focko <mfocko@redhat.com>

problems/swift/maximum-product-of-two-elements-in-an-array.swift

@@ -0,0 +1,16 @@
+class Solution {
+    func maxProduct(_ nums: [Int]) -> Int {
+        var m = 0
+
+        for i in 0..<nums.count - 1 {
+            for j in i + 1..<nums.count {
+                let p = (nums[i] - 1) * (nums[j] - 1)
+                if p > m {
+                    m = p
+                }
+            }
+        }
+
+        return m
+    }
+}