[SeongA] WEEK 01 solutions

two-sum/SeongA.swift

@@ -0,0 +1,16 @@
+class Solution {
+    func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
+        var dictionary: [Int: Int] = [:]
+        for (index, value) in nums.enumerated() {
+            let difference = target - value
+            if let otherIndex = dictionary[difference] {
+                return [otherIndex, index]
+            }
+            dictionary[value] = index
+        }
+        return []
+    }
+}
+
+
+