Форум StopLinux

# include <stdio.h>

int main()
{
    int a = 1;
    while(1)
    {
            a++;
            printf("%d\n",a);
            int c = 0;
            int b; 
            for(b = 1; b <= 20; b++)
            {
                    if((a % b) != 0) c = 1;
            }
            if(c == 0)
            {
                 printf("%d",a);
                 int ch = getchar();
                 break;
            }
    }
}

using System;
using System.Diagnostics;
using System.Linq;

namespace ConsoleApplication1
{
    class Program
    {
        static int Brute(int[] numbers )
        {
            int delta = numbers[numbers.Length - 1];
            for (int value = delta; ; value += delta)
            {
                bool result = true;
                foreach (var number in numbers)
                {
                    if (value % number != 0)
                    {
                        result = false;
                        break;
                    }
                }
                if(result) return value;
            }
        }

        static void Main(string[] args)
        {
            var numbers = Enumerable.Range(1, 20).ToList();
            
            //start timer
            Stopwatch timer = new Stopwatch();
            timer.Start();

            //array filtration
            for(int right = 0; right<numbers.Count; right++)
            {
                int rightIndex = numbers.Count - 1 - right;

                for (int left = 0; left < rightIndex; left++)
                {
                    if (numbers[rightIndex] % numbers[left] == 0)
                    {
                        numbers.RemoveAt(left);
                        left--;
                        rightIndex--;
                    }
                }
            }

            int value = Brute(numbers.ToArray());
            
            //stop timer
            timer.Stop();

            //see what we've got after filtration and result
            numbers.ForEach(Console.WriteLine);
            Console.WriteLine("End in {0} ms. Value is {1}", timer.ElapsedMilliseconds, value);
        }
    }
}