Create Coupon Code Validator.java

varunu28 · web-flow · commit 56dc31be4c81 · 2025-07-12T09:04:23.000-07:00
diff --git a/Easy/Coupon Code Validator.java b/Easy/Coupon Code Validator.java
@@ -0,0 +1,40 @@
+class Solution {
+    public List<String> validateCoupons(String[] code, String[] businessLine, boolean[] isActive) {
+        Map<String, List<String>> validBusinessLinesMap = new LinkedHashMap<>();
+        validBusinessLinesMap.put("electronics", new ArrayList<>());
+        validBusinessLinesMap.put("grocery", new ArrayList<>());
+        validBusinessLinesMap.put("pharmacy", new ArrayList<>());
+        validBusinessLinesMap.put("restaurant", new ArrayList<>());
+        int n = code.length;
+        for (int i = 0; i < n; i++) {
+            if (isActive[i]) {
+                String currentCode = code[i];
+                String currentBusinessLine = businessLine[i];
+                if (validBusinessLinesMap.containsKey(currentBusinessLine) && isValidCode(currentCode)) {
+                    validBusinessLinesMap.get(currentBusinessLine).add(currentCode);
+                }
+            }
+        }
+        List<String> result = new ArrayList<>();
+        for (Map.Entry<String, List<String>> entry : validBusinessLinesMap.entrySet()) {
+            if (!entry.getValue().isEmpty()) {
+                List<String> codes = new ArrayList<>(entry.getValue());
+                Collections.sort(codes);
+                result.addAll(codes);
+            }
+        }
+        return result;
+    }
+
+    private boolean isValidCode(String currentCode) {
+        if (currentCode == null || currentCode.isBlank()) {
+            return false;
+        }
+        for (char c : currentCode.toCharArray()) {
+            if (!(Character.isLetter(c) || Character.isDigit(c) || c == '_')) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
