Exemple #1
0
    public void Solve()
    {
        int N = ri();

        int[] LArray = ria();
        if (N < 3)
        {
            Console.WriteLine(0);
            Console.ReadLine();
            return;
        }

        Array.Sort(LArray);
        int[][] Lss = Combination.Enumerate(LArray, 3, withRepetition: false).ToArray();

        int ans = 0;

        foreach (int[] Ls in Lss)
        {
            if (Ls.Distinct().Count() != 3)
            {
                continue;
            }

            Array.Sort(Ls);
            if (Ls[2] < Ls[0] + Ls[1])
            {
                ans++;
            }
        }


        Console.WriteLine(ans);
        Console.ReadLine();
    }