Submission #1191485

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Source Code Expand

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace codefestival_2016_qualA_B
{
    class Program
    {
        static void Main(string[] args)
        {
            int ans = 0;
            int n = int.Parse(Console.ReadLine());
            int[] a = Console.ReadLine().Split().Select(int.Parse).ToArray();
            for (int i = 0; i < n; i++)
            {
                if (i + 1 == a[a[i] - 1])
                {
                    ans++;
                }
            }Console.Write(ans/2);
        }
    }
}

Submission Info

Judge Result