public override object SolvePart1(int input)
{
var fuelGrid = new FuelGrid(input);
var powerLevelSquares =
from x in Enumerable.Range(1, 298)
from y in Enumerable.Range(1, 298)
let powerLevel = (
from xOff in Enumerable.Range(0, 3)
from yOff in Enumerable.Range(0, 3)
let xPos = x + xOff
let yPos = y + yOff
select fuelGrid[xPos, yPos]
).Sum()
select(x, y, powerLevel);
var max = powerLevelSquares.Aggregate((x: 0, y: 0, powerLevel: int.MinValue),
(prev, next) => (next.powerLevel > prev.powerLevel) ? next : prev);
return($"{max.x},{max.y}");
}
public override object SolvePart2(int input)
{
var fuelGridArray = new FuelGrid(input).ToArray(301);
(int x, int y, int size)max = default;
var maxValue = int.MinValue;
for (var x = 1; x <= 300; x++)
{
for (var y = 1; y <= 300; y++)
{
var maxBoxSize = 300 - Math.Max(x, y);
for (var size = 0; size < maxBoxSize; size++)
{
var powerLevel = 0;
for (var xOff = 0; xOff <= size; xOff++)
{
for (var yOff = 0; yOff <= size; yOff++)
{
var xPos = x + xOff;
var yPos = y + yOff;
powerLevel += fuelGridArray[xPos][yPos];
}
}
if (powerLevel > maxValue)
{
max = (x, y, size + 1);
maxValue = powerLevel;
}
}
}
}
return($"{max.x},{max.y},{max.size}({maxValue})");
}
public void Test(int x, int y, int serialNumber, int expectedPowerLevel)
{
var calculatedPowerLevel = new FuelGrid(serialNumber)[x, y];
Assert.Equal(expectedPowerLevel, calculatedPowerLevel);
}
