diff --git a/3606. Coupon Code Validator b/3606. Coupon Code Validator
new file mode 100644
index 0000000..435540b
--- /dev/null
+++ b/3606. Coupon Code Validator	
@@ -0,0 +1,44 @@
+class Solution {
+public:
+    vector<string> validateCoupons(vector<string>& code,
+                                   vector<string>& businessLine,
+                                   vector<bool>& isActive) {
+        vector<string> e, g, p, r;
+
+        for (int i = 0; i < isActive.size(); i++) {
+            if (!isActive[i]) continue;
+
+            string& bl = businessLine[i];
+            if (bl != "electronics" && bl != "grocery" &&
+                bl != "pharmacy" && bl != "restaurant")
+                continue;
+
+            if (code[i].empty()) continue;
+
+            bool ok = true;
+            for (char c : code[i]) {
+                if (!isalnum(c) && c != '_') {
+                    ok = false; break;
+                }
+            }
+            if (!ok) continue;
+
+            if (bl[0] == 'e') e.push_back(code[i]);
+            if (bl[0] == 'g') g.push_back(code[i]);
+            if (bl[0] == 'p') p.push_back(code[i]);
+            if (bl[0] == 'r') r.push_back(code[i]);
+        }
+
+        sort(e.begin(), e.end());
+        sort(g.begin(), g.end());
+        sort(p.begin(), p.end());
+        sort(r.begin(), r.end());
+
+        vector<string> res;
+        res.insert(res.end(), e.begin(), e.end());
+        res.insert(res.end(), g.begin(), g.end());
+        res.insert(res.end(), p.begin(), p.end());
+        res.insert(res.end(), r.begin(), r.end());
+        return res;
+    }
+};