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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 int RunIntCode(int noun, int verb)
{
var v = input.ToList();
v[1] = noun; v[2] = verb;
for (var i = 0; v[i] != 99; i += 4)
v[v[i + 3]] = v[i] switch
{
1 => v[v[i + 1]] + v[v[i + 2]],
2 => v[v[i + 1]] * v[v[i + 2]]
};
return v[0];
}
public override string Part1()
{
return $"{RunIntCode(12, 2)}";
}
public override string Part2()
{
for (var i = 0; i < 100; i++)
for (var j = 0; j < 100; j++)
if (RunIntCode(i, j) == 19690720)
return $"{100 * i + j}";
return string.Empty;
}
}
}
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