Create Solution.java

Author: Jerring

solution/0929.Unique Email Addresses/Solution.java

@@ -0,0 +1,17 @@
+class Solution {
+    public int numUniqueEmails(String[] emails) {
+        Set<String> set = new HashSet<>();
+        for (String email : emails) {
+            int index = email.indexOf('@');
+            String local = email.substring(0, index);
+            String domain = email.substring(index);
+            index = local.indexOf('+');
+            if (index != -1) {
+                local = local.substring(0, index);
+            }
+            local = local.replace(".", "");
+            set.add(local + domain);
+        }
+        return set.size();
+    }
+}