Submission #1000716

---

Source Code Expand

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskC solver = new TaskC();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskC {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int n = in.nextInt();
            int[] arr = new int[n];
            int curxor = 0;
            for (int i = 0; i < n; i++) {
                int x = in.nextInt();
                curxor ^= x;
                arr[i] = x ^ (x - 1);
            }
            if (curxor == 0) {
                out.println(0);
            }

            int count = 0;
            for (int i = 0; i < 60; i++) {
                for (int j = 0; j < n; j++) {
                    if ((curxor ^ arr[j]) < curxor) {
                        curxor ^= arr[j];
                        count++;
                    }
                }
            }
            if (curxor == 0) {
                out.println(count);
            } else {
                out.println(-1);
            }
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}

Submission Info

Judge Result