public static int Part2Solution(string[] lines)
{
string[] firstWireInput = lines[0].Split(",");
string[] secondWireOutput = lines[1].Split(",");
List <GridMark> firstWireMarks = CreateGridMarks(firstWireInput);
List <GridMark> secondWireMarks = CreateGridMarks(secondWireOutput);
var intersections = FetchIntersections(firstWireMarks, secondWireMarks);
int lessSteps = 0;
foreach (var intersection in intersections)
{
GridMark mark1 = firstWireMarks.First(item => item.X == intersection.X && item.Y == intersection.Y);
GridMark mark2 = secondWireMarks.First(item => item.X == intersection.X && item.Y == intersection.Y);
if (lessSteps == 0)
{
lessSteps = mark1.Steps + mark2.Steps;
}
else
{
lessSteps = lessSteps > mark1.Steps + mark2.Steps ? mark1.Steps + mark2.Steps : lessSteps;
}
}
return(lessSteps);
}
private static List <GridMark> CreateGridMarks(string[] wireInput)
{
List <GridMark> wireMarks = new List <GridMark>();
GridMark currentPosition = new GridMark(0, 0, 0);
foreach (var instruction in wireInput)
{
char direction = instruction[0];
int nSteps = int.Parse(instruction.Substring(1));
switch (direction)
{
case 'R':
for (var i = 0; i < nSteps; i++)
{
currentPosition.X++;
currentPosition.Steps++;
wireMarks.Add(currentPosition.Clone());
}
break;
case 'U':
for (var i = 0; i < nSteps; i++)
{
currentPosition.Y++;
currentPosition.Steps++;
wireMarks.Add(currentPosition.Clone());
}
break;
case 'L':
for (var i = 0; i < nSteps; i++)
{
currentPosition.X--;
currentPosition.Steps++;
wireMarks.Add(currentPosition.Clone());
}
break;
case 'D':
for (var i = 0; i < nSteps; i++)
{
currentPosition.Y--;
currentPosition.Steps++;
wireMarks.Add(currentPosition.Clone());
}
break;
}
}
return(wireMarks);
}
