s 3, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
           int number, i, k, count = 1;
        Console.Write("Enter number of rows\n");
        number = int.Parse(Console.ReadLine());
        count = number - 1;
        for (k = 1; k <= number; k++)
        {
            for (i = 1; i <= count; i++)
                Console.Write(" ");
            count--;
            for (i = 1; i <= 2 * k - 1; i++)
                Console.Write("*");
            Console.WriteLine();
        }
        count = 1;
        for (k = 1; k <= number - 1; k++)
        {
            for (i = 1; i <= count; i++)
                Console.Write(" ");
            count++;
            for (i = 1; i <= 2 * (number - k) - 1; i++)
                Console.Write("*");
            Console.WriteLine();
        }
        Console.ReadLine();
    }
}
        }

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 10 sec, cpu time: 0,08 sec, average memory usage: 25 Mb, average nr of threads: 5, absolute service time: 10,13 sec