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