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Day 7 - Part 1

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Chris Kaczor
2019-12-10 17:40:54 -05:00
parent 163e35f732
commit 7d121d4ff8
4 changed files with 195 additions and 2 deletions
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IntcodeComputer.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
namespace Advent
{
public class IntcodeComputer
{
private enum ParameterMode
{
Position,
Immediate
}
private static int GetValue(IReadOnlyList<int> codes, int parameter, ParameterMode mode)
{
return mode == ParameterMode.Immediate ? parameter : codes[parameter];
}
public int? Execute(int[] inputs, string commands)
{
var codes = commands.Split(',').Select(int.Parse).ToArray();
var position = 0;
var done = false;
var inputIndex = 0;
int? output = null;
while (!done)
{
var (mode1, mode2, mode3, opCode) = ParseOpCode(codes[position]);
switch (opCode)
{
case 1:
codes[codes[position + 3]] = GetValue(codes, codes[position + 1], mode1) + GetValue(codes, codes[position + 2], mode2);
position += 4;
break;
case 2:
codes[codes[position + 3]] = GetValue(codes, codes[position + 1], mode1) * GetValue(codes, codes[position + 2], mode2);
position += 4;
break;
case 3:
codes[codes[position + 1]] = inputs[inputIndex++];
position += 2;
break;
case 4:
output = GetValue(codes, codes[position + 1], ParameterMode.Position);
position += 2;
break;
case 5:
{
var value = GetValue(codes, codes[position + 1], mode1);
if (value != 0)
position = GetValue(codes, codes[position + 2], mode2);
else
position += 3;
}
break;
case 6:
{
var value = GetValue(codes, codes[position + 1], mode1);
if (value == 0)
position = GetValue(codes, codes[position + 2], mode2);
else
position += 3;
}
break;
case 7:
{
var value1 = GetValue(codes, codes[position + 1], mode1);
var value2 = GetValue(codes, codes[position + 2], mode2);
if (value1 < value2)
codes[codes[position + 3]] = 1;
else
codes[codes[position + 3]] = 0;
position += 4;
}
break;
case 8:
{
var value1 = GetValue(codes, codes[position + 1], mode1);
var value2 = GetValue(codes, codes[position + 2], mode2);
if (value1 == value2)
codes[codes[position + 3]] = 1;
else
codes[codes[position + 3]] = 0;
position += 4;
}
break;
case 99:
done = true;
break;
}
}
return output;
}
private static (ParameterMode mode1, ParameterMode mode2, ParameterMode mode3, int opCode) ParseOpCode(int fullOpCode)
{
var codeString = fullOpCode.ToString("00000").ToCharArray();
var mode1 = Enum.Parse<ParameterMode>(codeString[2].ToString());
var mode2 = Enum.Parse<ParameterMode>(codeString[1].ToString());
var mode3 = Enum.Parse<ParameterMode>(codeString[0].ToString());
var opCode = int.Parse(codeString[3].ToString() + codeString[4]);
return (mode1, mode2, mode3, opCode);
}
}
}