题解 | 被打乱的异或和

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
// 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) throws IOException {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        StreamTokenizer in = new StreamTokenizer(br);

        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        in.nextToken();
        int t = (int) in.nval;

        for (int i = 0; i < t; i++) {
            solve(in, out);
        }

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

    private static void solve(StreamTokenizer in,PrintWriter out)throws IOException{
        in.nextToken();
        int m = (int)in.nval;

        int[] ans =new int[m];

        for(int i=0;i<m;i++){
            in.nextToken();
            ans[i]=(int)in.nval;
        }
        out.println(ans[0]);
    }
}