diff --git a/AcWing/16/16.cpp b/AcWing/16/16.cpp
new file mode 100644
index 00000000..52ed2f08
--- /dev/null
+++ b/AcWing/16/16.cpp
@@ -0,0 +1,12 @@
+class Solution {
+  public:
+    string replaceSpaces(string &str) {
+        string res;
+        for (auto c : str)
+            if (c == ' ')
+                res += "%20";
+            else
+                res += c;
+        return res;
+    }
+};