static void Main(string[] args)
{
// Part 1
var numList = PROBLEM_INPUT.Split('\n', StringSplitOptions.RemoveEmptyEntries).Select(e => int.Parse(e)).ToList();
for (int i = 0; i < numList.Count; i++)
{
for (int j = i + 1; j < numList.Count; j++)
{
if (numList[i] + numList[j] == 2020)
{
Console.WriteLine($"{numList[i] * numList[j]}");
break;
}
}
}
// Part 2
for (int i = 0; i < numList.Count; i++)
{
for (int j = i + 1; j < numList.Count; j++)
{
for (int k = j + 1; k < numList.Count; k++)
{
if (numList[i] + numList[j] + numList[k] == 2020)
{
Console.WriteLine($"{numList[i] * numList[j] * numList[k]}");
break;
}
}
}
}
}
static void Main(string[] args)
{
Console.WriteLine(Helper(EXAMPLE_INPUT_1, false));
Console.WriteLine(Helper(EXAMPLE_INPUT_2, false));
Console.WriteLine(PROBLEM_INPUT.Split('\n', StringSplitOptions.RemoveEmptyEntries).Select(e => Helper(e, false)).Sum());
Console.WriteLine(Helper(EXAMPLE_INPUT_1, true));
Console.WriteLine(Helper(EXAMPLE_INPUT_2, true));
Console.WriteLine(PROBLEM_INPUT.Split('\n', StringSplitOptions.RemoveEmptyEntries).Select(e => Helper(e, true)).Sum());
Console.WriteLine("Hello World!");
}