116 lines
4.0 KiB
C#
116 lines
4.0 KiB
C#
namespace AOC2015;
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/// <summary>
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/// Day 7: <a href="https://adventofcode.com/2015/day/7"/>
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/// </summary>
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public sealed class Day07() : Day(2015, 7, "Some Assembly Required")
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{
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private readonly Dictionary<string, Func<ushort>> _actions = [];
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private readonly Dictionary<string, ushort> _wires = [];
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public override object Part1()
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{
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ProcessInstructions();
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return _actions["a"]();
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}
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private void ProcessInstructions()
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{
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_actions.Clear();
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_wires.Clear();
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foreach (var line in Input)
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{
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var split = line.Split(' ');
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var destination = split.Last();
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switch (split.Length)
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{
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case 3:
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if (ushort.TryParse(split[0], out var val))
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{
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_actions.Add(destination, () => val);
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_wires.Add(destination, val);
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}
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else
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{
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_actions.Add(destination, () =>
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{
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if (_wires.TryGetValue(destination, out var wire)) return wire;
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var res = _actions[split[0]]();
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_wires.Add(destination, res);
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return res;
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});
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}
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break;
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case 4:
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_actions.Add(destination, () => (ushort)~_actions[split[1]]());
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break;
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case 5:
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switch (split[1])
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{
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case "AND":
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_actions.Add(destination, () =>
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{
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if (_wires.TryGetValue(destination, out var wire)) return wire;
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var res = (ushort)((ushort.TryParse(split[0], out var v)
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? v
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: _actions[split[0]]()) & _actions[split[2]]());
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_wires.Add(destination, res);
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return res;
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});
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break;
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case "OR":
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_actions.Add(destination, () =>
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{
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if (_wires.TryGetValue(destination, out var wire)) return wire;
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var res = (ushort)((ushort.TryParse(split[0], out var v)
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? v
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: _actions[split[0]]()) | _actions[split[2]]());
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_wires.Add(destination, res);
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return res;
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});
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break;
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case "LSHIFT":
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_actions.Add(destination, () =>
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{
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if (_wires.TryGetValue(destination, out var wire)) return wire;
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var res = (ushort)(_actions[split[0]]() << ushort.Parse(split[2]));
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_wires.Add(destination, res);
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return res;
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});
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break;
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case "RSHIFT":
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_actions.Add(destination, () =>
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{
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if (_wires.TryGetValue(destination, out var wire)) return wire;
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var res = (ushort)(_actions[split[0]]() >> ushort.Parse(split[2]));
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_wires.Add(destination, res);
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return res;
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});
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break;
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}
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break;
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}
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}
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}
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public override object Part2()
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{
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ProcessInstructions();
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var p1 = _actions["a"]();
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ProcessInstructions();
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_actions["b"] = () => p1;
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return _actions["a"]();
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}
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}
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