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Day 7 - Part 2

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Chris Kaczor
2019-12-10 18:04:12 -05:00
parent 7d121d4ff8
commit e2ae232d03
2 changed files with 72 additions and 49 deletions
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88
IntcodeComputer.cs
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@@ -12,116 +12,128 @@ namespace Advent
Immediate
}
private readonly int[] _memory;
private readonly int _phase;
private bool _setPhase;
private int _instructionPointer;
private int _output;
public bool Halted { get; private set; }
public IntcodeComputer(string memoryString, int phase)
{
_memory = memoryString.Split(',').Select(int.Parse).ToArray();
_phase = phase;
}
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)
public int Execute(int input)
{
var codes = commands.Split(',').Select(int.Parse).ToArray();
var position = 0;
var done = false;
var inputIndex = 0;
int? output = null;
while (!done)
while (!Halted)
{
var (mode1, mode2, mode3, opCode) = ParseOpCode(codes[position]);
var (mode1, mode2, mode3, opCode) = ParseOpCode(_memory[_instructionPointer]);
switch (opCode)
{
case 1:
codes[codes[position + 3]] = GetValue(codes, codes[position + 1], mode1) + GetValue(codes, codes[position + 2], mode2);
_memory[_memory[_instructionPointer + 3]] = GetValue(_memory, _memory[_instructionPointer + 1], mode1) + GetValue(_memory, _memory[_instructionPointer + 2], mode2);
position += 4;
_instructionPointer += 4;
break;
case 2:
codes[codes[position + 3]] = GetValue(codes, codes[position + 1], mode1) * GetValue(codes, codes[position + 2], mode2);
_memory[_memory[_instructionPointer + 3]] = GetValue(_memory, _memory[_instructionPointer + 1], mode1) * GetValue(_memory, _memory[_instructionPointer + 2], mode2);
position += 4;
_instructionPointer += 4;
break;
case 3:
codes[codes[position + 1]] = inputs[inputIndex++];
var inputValue = _setPhase ? input : _phase;
position += 2;
_setPhase = true;
_memory[_memory[_instructionPointer + 1]] = inputValue;
_instructionPointer += 2;
break;
case 4:
output = GetValue(codes, codes[position + 1], ParameterMode.Position);
_output = GetValue(_memory, _memory[_instructionPointer + 1], ParameterMode.Position);
position += 2;
_instructionPointer += 2;
break;
return _output;
case 5:
{
var value = GetValue(codes, codes[position + 1], mode1);
var value = GetValue(_memory, _memory[_instructionPointer + 1], mode1);
if (value != 0)
position = GetValue(codes, codes[position + 2], mode2);
_instructionPointer = GetValue(_memory, _memory[_instructionPointer + 2], mode2);
else
position += 3;
_instructionPointer += 3;
}
break;
case 6:
{
var value = GetValue(codes, codes[position + 1], mode1);
var value = GetValue(_memory, _memory[_instructionPointer + 1], mode1);
if (value == 0)
position = GetValue(codes, codes[position + 2], mode2);
_instructionPointer = GetValue(_memory, _memory[_instructionPointer + 2], mode2);
else
position += 3;
_instructionPointer += 3;
}
break;
case 7:
{
var value1 = GetValue(codes, codes[position + 1], mode1);
var value2 = GetValue(codes, codes[position + 2], mode2);
var value1 = GetValue(_memory, _memory[_instructionPointer + 1], mode1);
var value2 = GetValue(_memory, _memory[_instructionPointer + 2], mode2);
if (value1 < value2)
codes[codes[position + 3]] = 1;
_memory[_memory[_instructionPointer + 3]] = 1;
else
codes[codes[position + 3]] = 0;
_memory[_memory[_instructionPointer + 3]] = 0;
position += 4;
_instructionPointer += 4;
}
break;
case 8:
{
var value1 = GetValue(codes, codes[position + 1], mode1);
var value2 = GetValue(codes, codes[position + 2], mode2);
var value1 = GetValue(_memory, _memory[_instructionPointer + 1], mode1);
var value2 = GetValue(_memory, _memory[_instructionPointer + 2], mode2);
if (value1 == value2)
codes[codes[position + 3]] = 1;
_memory[_memory[_instructionPointer + 3]] = 1;
else
codes[codes[position + 3]] = 0;
_memory[_memory[_instructionPointer + 3]] = 0;
position += 4;
_instructionPointer += 4;
}
break;
case 99:
done = true;
Halted = true;
break;
return _output;
}
}
return output;
return _output;
}
private static (ParameterMode mode1, ParameterMode mode2, ParameterMode mode3, int opCode) ParseOpCode(int fullOpCode)