44 lines
1.1 KiB
C#
44 lines
1.1 KiB
C#
using System.Collections.Generic;
|
|
using System.IO;
|
|
using System.Linq;
|
|
|
|
namespace aoc2019
|
|
{
|
|
public class Day2 : Day
|
|
{
|
|
public override int DayNumber => 2;
|
|
|
|
private readonly IEnumerable<int> input =
|
|
File.ReadLines("input/day2.in").First().Split(',').Select(int.Parse);
|
|
|
|
public static List<int> RunIntCode(int noun, int verb, List<int> v)
|
|
{
|
|
v[1] = noun; v[2] = verb;
|
|
|
|
for (var i = 0; v[i] != 99; i += 4)
|
|
switch (v[i])
|
|
{
|
|
case 1: v[v[i + 3]] = v[v[i + 1]] + v[v[i + 2]]; break;
|
|
case 2: v[v[i + 3]] = v[v[i + 1]] * v[v[i + 2]]; break;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
public override string Part1()
|
|
{
|
|
return $"{RunIntCode(12, 2, input.ToList())[0]}";
|
|
}
|
|
|
|
public override string Part2()
|
|
{
|
|
for (var i = 0; i < 100; i++)
|
|
for (var j = 0; j < 100; j++)
|
|
if (RunIntCode(i, j, input.ToList())[0] == 19690720)
|
|
return $"{100 * i + j}";
|
|
|
|
return string.Empty;
|
|
}
|
|
}
|
|
}
|
|
|