题解 | Poi 的新加法（Easy Version）

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {
     public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        StringBuilder sb = new StringBuilder();

        String line ;
        while ((line = br.readLine() )!= null) {
            sb.append(line.trim()).append(" ");
        }
        StringTokenizer in = new StringTokenizer(sb.toString());
        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        int t = Integer.parseInt(in.nextToken());

        for (int i = 0; i < t; i++) {
            long m = Long.parseLong(in.nextToken());
            long query = Long.parseLong(in.nextToken());

            long res = 0;

            for (int j = 0; j < m; j++) {
                long val = Long.parseLong(in.nextToken());
                res = j > 0 ? ~(res ^ val) & res : val;

                if (res > 0 && j > 0) {
                    res <<= 1;
                }
            }
            int left = Integer.parseInt(in.nextToken());
            int right = Integer.parseInt(in.nextToken());
            out.println(res);
            res = 0;
        }

        out.flush();
        out.close();
        br.close();
    }

}