public static bool FindTwinNumbers(Random rand)
{
List <int> randomList = RandomExtensions.GenerateRandomList(rand, -1000, 10000, 10000);
Dictionary <int, int> numbers = new Dictionary <int, int>();
//ShowList(randomList);
foreach (var item in randomList)
{
if (numbers.ContainsKey(item))
{
if (numbers.ContainsKey(item * -1))
{
Console.WriteLine("Found first Pair that sums to zero: " + item + " & " + (item * -1));
return(true);
}
}
else
{
numbers.Add(item, 1);
}
}
Console.WriteLine("No Pair found that sums to zero");
return(false);
}
public static void FindAllTwinNumbers(Random rand)
{
List <int> randomList = RandomExtensions.GenerateRandomList(rand, -10, 10, 50);
Dictionary <int, int> numbers = new Dictionary <int, int>();
ShowList(randomList);
Console.WriteLine();
List <int> pairs = new List <int>();
foreach (var item in randomList)
{
if (numbers.ContainsKey(item))
{
if (numbers.ContainsKey(item * -1))
{
pairs.Add(item);
numbers.Remove(item);
numbers.Remove(item * -1);
}
}
else
{
numbers.Add(item, 1);
}
}
if (pairs.Count > 0)
{
Console.WriteLine("Twin Pairs:");
pairs.Sort();
foreach (var item in pairs)
{
Console.Write(item + "\t");
}
Console.WriteLine();
}
else
{
Console.WriteLine("No Twin pairs found");
}
}