first commit

J01010 - CẮT ĐÔI.java

@@ -0,0 +1,37 @@
+
+import java.util.Scanner;
+public class Main {
+    static char convert(char x) {
+        if (x == '0')
+            return '0';
+        if (x == '1')
+            return '1';
+        if (x == '8')
+            return '0';
+        if (x == '9')
+            return '0';
+        return '2';
+    }
+
+    static String ans(char[] a) {
+        for (int i = 0; i < a.length; i++) {
+            a[i] = convert(a[i]);
+            if (a[i] == '2')
+                return "INVALID";
+        }
+        String s = new String(a);
+        s=s.replaceFirst("^0+", "");  
+        if ("".equals(s)) return "INVALID";
+        return s;
+    }
+
+    public static void main(String[] args) {
+        Scanner reader = new Scanner(System.in);
+        int t = Integer.parseInt(reader.nextLine());
+        for (int i = 0; i < t; i++) {
+            String s = reader.nextLine();
+            System.out.println(ans(s.toCharArray()));
+        }
+        reader.close();
+    }
+}