View Compilation Error

0_0_39769105_21367.cpp:1:1: error: 'import' does not name a type
    1 | import java.util.Scanner;//引入Scannerimport java.math.BigInteger;//引入BigIntegerpublic class Problem1002 {    public static void main(String[] args)  {               Scanner sc = new Scanner(System.in);            int t = sc.nextInt();           BigInteger number1,number2;             for(int i = 1;i <= t; i++)              {                       System.out.println("Case "+i+":");                      number1 = sc.nextBigInteger();                  number2 = sc.nextBigInteger();                  System.out.println(number1+" + "+number2+" = "+number1.add(number2));                   if(i < t) System.out.println();         }       }}
      | ^~~~~~
0_0_39769105_21367.cpp:1:1: note: C++20 'import' only available with '-fmodules-ts', which is not yet enabled with '-std=c++20'