妳可以用下面的Java程序,我測的運行時間是21ms.
import java.util.Scanner;
public class AA {
public static void main(String[] args) { Scanner x=new Scanner(System.in); String stra=x.nextLine(); String strb=x.nextLine(); for(int i=0;i<strb.length();i++){ stra=stra.replace(strb.charAt(i)+"",""); } System.out.println(stra); }}