diff --git a/swift/2013-detect-squares.swift b/swift/2013-detect-squares.swift
new file mode 100644
index 000000000..09c58c0ff
--- /dev/null
+++ b/swift/2013-detect-squares.swift
@@ -0,0 +1,35 @@
+
+class DetectSquares {
+
+ var pts = [[Int]]()
+ var ptsCount = [[Int]: Int]()
+
+ init() {
+
+ }
+
+ func add(_ point: [Int]) {
+ ptsCount[point, default: 0] += 1
+ pts.append(point)
+ }
+
+ func count(_ point: [Int]) -> Int {
+ var res = 0
+ var x = point[0], y = point[1]
+ for val in pts {
+ let px = val[0], py = val[1]
+ if abs(py - y) != abs(px - x) || x == px || y == py {
+ continue
+ }
+ res += ptsCount[[x, py], default: 0] * ptsCount[[px, y], default: 0]
+ }
+ return res
+ }
+}
+
+/**
+ * Your DetectSquares object will be instantiated and called as such:
+ * let obj = DetectSquares()
+ * obj.add(point)
+ * let ret_2: Int = obj.count(point)
+ */
\ No newline at end of file
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