first commit

J03010 - ĐỊA CHỈ EMAIL.java

@@ -0,0 +1,31 @@
+import java.util.Scanner;
+import java.util.HashMap;
+
+public class Main{
+    static String mail(String s){
+        String[] a = s.split("[' ']+");
+        String r = a[a.length-1];
+        for(int i=0; i<a.length-1; i++){
+            if(a[i].length() != 0) r += Character.toString(a[i].charAt(0));
+        }
+        return r;
+    }
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        sc.next();
+        HashMap<String, Integer> a = new HashMap<>();
+        while(sc.hasNextLine()){
+            String name = sc.nextLine();
+            if(name.length() == 0) continue;
+            String user = mail(name.toLowerCase());
+            if(a.get(user) == null){
+                a.put(user, 2);
+            }else{
+                int th = a.get(user);
+                a.put(user, th+1);
+                user += Integer.toString(th);
+            }
+            System.out.println(user + "@ptit.edu.vn");
+        }
+    }
+}