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using System.Collections.Generic;
using System.Linq;
namespace aoc2019
{
internal sealed class Day1 : Day
{
public override int DayNumber => 1;
private readonly IEnumerable<int> masses;
public Day1()
{
masses = Input.Select(int.Parse);
}
private static int FuelCost(int weight) => weight / 3 - 2;
private static int FullCost(int cost)
{
int total = 0, newcost, tmp = cost;
while ((newcost = FuelCost(tmp)) >= 0)
{
total += newcost;
tmp = newcost;
}
return total;
}
public override string Part1() => $"{masses.Sum(FuelCost)}";
public override string Part2() => $"{masses.Sum(FullCost)}";
}
}
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