diff --git a/swift/42-Trapping-Rain-Water.swift b/swift/42-Trapping-Rain-Water.swift
new file mode 100644
index 000000000..8fd569e30
--- /dev/null
+++ b/swift/42-Trapping-Rain-Water.swift
@@ -0,0 +1,30 @@
+class Solution {
+ func trap(_ height: [Int]) -> Int {
+ if height == nil {
+ return 0
+ }
+
+ var res = 0
+ var l = 0
+ var r = height.count - 1
+
+ var leftMax = height[l]
+ var rightMax = height[r]
+
+ while l < r {
+ if leftMax < rightMax {
+ l += 1
+ leftMax = max(leftMax, height[l])
+ res += leftMax - height[l]
+ } else {
+ r -= 1
+ rightMax = max(rightMax, height[r])
+ res += rightMax - height[r]
+ }
+ }
+
+ return res
+
+ }
+
+}
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