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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
namespace aoc2019
{
public class Day1 : Day
{
private static readonly IEnumerable<int> lines =
File.ReadLines("input/day1.in").Select(line => int.Parse(line));
private static int FuelCost(int weight) => weight / 3 - 2;
public override void Part1()
{
Console.WriteLine(lines.Select(num => FuelCost(num)).Sum());
}
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 void Part2()
{
Console.WriteLine(lines.Select(cost => FullCost(cost)).Sum());
}
}
}
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