在输入文件 input.txt 中的线程“main”java.util.NoSuchElementException 错误中引发异常。它包含 +34

    import java.util.*;
import java.lang.*;
import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException{
        Scanner in = new Scanner(new FileReader("input.txt"));
        PrintWriter out = new PrintWriter(new FileWriter("output.txt"));
        int n;
        int i;
        ArrayList<Integer> a = new ArrayList<>();
        n = in.nextInt();
        for (i = 0; i < n; i++) {
            a.add(in.nextInt());
        }
        for (i = 0; i < n; i++) {
            for (int j = i + 1; j < n; j++) {
                if (a.get(i) == -a.get(j)) {
                    a.remove(i);
                    a.remove(j);
                }
            }
        }
        for (i = 0; i < n; i++) {
            System.out.println(a.get(i));
        }
        in.close();
        out.close();
    }
}