Submission #2326808

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Source Code Expand

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.Remoting.Contexts;
using System.Security.Cryptography.X509Certificates;

namespace Contest
{
    class Scanner
    {
        private string[] line = new string[0];
        private int index = 0;
        public string Next()
        {
            if (line.Length <= index)
            {
                line = Console.ReadLine().Split(' ');
                index = 0;
            }
            var res = line[index];
            index++;
            return res;
        }
        public int NextInt()
        {
            return int.Parse(Next());
        }
        public long NextLong()
        {
            return long.Parse(Next());
        }
        public string[] Array()
        {
            line = Console.ReadLine().Split(' ');
            index = line.Length;
            return line;
        }
        public int[] IntArray()
        {
            var array = Array();
            var result = new int[array.Length];
            for (int i = 0; i < array.Length; i++)
            {
                result[i] = int.Parse(array[i]);
            }

            return result;
        }
        public long[] LongArray()
        {
            var array = Array();
            var result = new long[array.Length];
            for (int i = 0; i < array.Length; i++)
            {
                result[i] = long.Parse(array[i]);
            }

            return result;
        }
    }

    class Program
    {
        private int N;
        private long[] A;
        private void Scan()
        {
            var sc = new Scanner();
            N = sc.NextInt();
            A = new long[N];
            for (int i = 0; i < N; i++)
            {
                A[i] = sc.NextLong();
            }
        }

        public void Solve()
        {
            Scan();
            long x = 0;
            foreach (long i in A)
            {
                x ^= i;
            }

            int cnt = 0;
            for (int i = 29; i >= 0; i--)
            {
                var b = 1 << i;
                foreach (var i1 in A)
                {
                    var u = i1 ^ (i1 - 1);
                    if ((x & ((u + 1) >> 1)) > 0)
                    {
                        if ((b & u) > 0)
                        {
                            x ^= u;
                            cnt++;
                            break;
                        }
                    }
                }
            }

            Console.WriteLine(x == 0 ? cnt : -1);
        }

        static void Main(string[] args)
        {
            new Program().Solve();
        }
    }
}

Submission Info

Judge Result