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Day 12 - Part 2

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Chris Kaczor
2019-12-12 20:44:49 -05:00
parent 6c43ae6078
commit 8de919dce0
1 changed files with 115 additions and 9 deletions
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124
Day12/Day12.cs
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@@ -29,16 +29,36 @@ namespace Advent
public Coordinates Position { get; }
public Coordinates Velocity { get; }
public string GetState()
{
return $"{Position.Z},{Velocity.Z}";
}
}
public static void Execute()
{
/*
<x=-1, y=0, z=2>
<x=2, y=-10, z=-7>
<x=4, y=-8, z=8>
<x=3, y=5, z=-1>
*/
//var moons = new List<Moon>
//{
// new Moon(-1, 0, 2) ,
// new Moon(2, -10, -7),
// new Moon(4, -8, 8 ),
// new Moon(3, 5, -1 )
//};
/*
<x=-4, y=-9, z=-3>
<x=-13, y=-11, z=0>
<x=-17, y=-7, z=15>
<x=-16, y=4, z=2>
*/
*/
var moons = new List<Moon>
{
@@ -48,7 +68,14 @@ namespace Advent
new Moon(-16, 4, 2 )
};
for (var count = 1; count <= 1000; count++)
//Console.WriteLine(lcm_of_array_elements(new long[] { 113028, 167624, 231614 }));
//return;
var previousStates = new Dictionary<string, int>();
var index = 1;
while (true)
{
for (var a = 0; a <= 3; a++)
{
@@ -98,19 +125,98 @@ namespace Advent
moon.Position.Y += moon.Velocity.Y;
moon.Position.Z += moon.Velocity.Z;
}
var states = new List<string>();
foreach (var moon in moons)
states.Add(moon.GetState());
var totalState = string.Join(':', states.ToArray());
if (previousStates.ContainsKey(totalState))
{
Console.WriteLine(index - previousStates[totalState]);
break;
}
else
{
previousStates[totalState] = index++;
}
}
var totalEnergy = 0;
//var totalEnergy = 0;
foreach (var moon in moons)
//foreach (var moon in moons)
//{
// var potentialEnergy = Math.Abs(moon.Position.X) + Math.Abs(moon.Position.Y) + Math.Abs(moon.Position.Z);
// var kineticEnergy = Math.Abs(moon.Velocity.X) + Math.Abs(moon.Velocity.Y) + Math.Abs(moon.Velocity.Z);
// totalEnergy += (potentialEnergy * kineticEnergy);
//}
//Console.WriteLine(totalEnergy);
}
private static long lcm_of_array_elements(long[] element_array)
{
long lcm_of_array_elements = 1;
int divisor = 2;
while (true)
{
var potentialEnergy = Math.Abs(moon.Position.X) + Math.Abs(moon.Position.Y) + Math.Abs(moon.Position.Z);
var kineticEnergy = Math.Abs(moon.Velocity.X) + Math.Abs(moon.Velocity.Y) + Math.Abs(moon.Velocity.Z);
totalEnergy += (potentialEnergy * kineticEnergy);
int counter = 0;
bool divisible = false;
for (int i = 0; i < element_array.Length; i++)
{
// lcm_of_array_elements (n1, n2, ... 0) = 0.
// For negative number we convert into
// positive and calculate lcm_of_array_elements.
if (element_array[i] == 0)
{
return 0;
}
else if (element_array[i] < 0)
{
element_array[i] = element_array[i] * (-1);
}
if (element_array[i] == 1)
{
counter++;
}
// Divide element_array by devisor if complete
// division i.e. without remainder then replace
// number with quotient; used for find next factor
if (element_array[i] % divisor == 0)
{
divisible = true;
element_array[i] = element_array[i] / divisor;
}
}
// If divisor able to completely divide any number
// from array multiply with lcm_of_array_elements
// and store into lcm_of_array_elements and continue
// to same divisor for next factor finding.
// else increment divisor
if (divisible)
{
lcm_of_array_elements = lcm_of_array_elements * divisor;
}
else
{
divisor++;
}
// Check if all element_array is 1 indicate
// we found all factors and terminate while loop.
if (counter == element_array.Length)
{
return lcm_of_array_elements;
}
}
Console.WriteLine(totalEnergy);
}
}
}