组合
import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int T=in.nextInt(); while(T-->0){ int a=in.nextInt(); int b=in.nextInt(); int c=in.nextInt(); long res=(long)a*b+(long)b*c+(long)c*a; System.out.println(res); } } }