[Math] Add a solution to Line Reflection

Math/LineReflection.swift

@@ -0,0 +1,33 @@
+/**
+ * Question Link: https://leetcode.com/problems/line-reflection/
+ * Primary idea: Find a Line that should be y = (minX + maxX) / 2, then iterate through points and make sure that it has a reflected point in the opposite side.
+ *
+ * Time Complexity: O(n), Space Complexity: O(n)
+ */
+
+ class LineReflection {
+    func isReflected(_ points: [[Int]]) -> Bool {
+        var minX = Int.max, maxX = Int.min
+        var pointSet = Set<[Int]>()
+
+        for point in points {
+            pointSet.insert(point)
+            minX = min(point[0], minX)
+            maxX = max(point[0], maxX)
+        }
+
+        let sum = minX + maxX
+
+        for item in pointSet {
+            if item[0] == sum {
+                continue
+            }
+
+            if !pointSet.contains([sum - item[0], item[1]]) {
+                return false
+            }
+        }
+
+        return true
+    }
+}

README.md

@@ -4,7 +4,7 @@
 ![Leetcode](./logo.png?style=centerme)
 
 ## Progress
-[Problem Status](#problem-status) shows the latest progress to all 1000+ questions. Currently we have 297 completed solutions. Note: questions with ♥ mark means that you have to **Subscript to premium membership** of LeetCode to unlock them.
+[Problem Status](#problem-status) shows the latest progress to all 1000+ questions. Currently we have 298 completed solutions. Note: questions with ♥ mark means that you have to **Subscript to premium membership** of LeetCode to unlock them.
 
 ## Contributors
 
@@ -327,6 +327,7 @@
 [K-th Smallest in Lexicographical Order](https://leetcode.com/problems/k-th-smallest-in-lexicographical-order/)| [Swift](./Math/KthSmallestLexicographicalOrder.swift)| Hard| O(n)| O(1)|
 [Gary Code](https://leetcode.com/problems/gray-code/)| [Swift](./Math/GaryCode.swift)| Medium| O(n)| O(2^n)|
 [Permutation Sequence](https://leetcode.com/problems/permutation-sequence/)| [Swift](./Math/PermutationSequence.swift)| Medium| O(n^2)| O(1)|
+[Line Reflection](https://leetcode.com/problems/line-reflection/)| [Swift](./Math/LineReflection.swift)| Medium| O(n)| O(n)|
 
 ## Search
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