104 lines
3.5 KiB
C#
104 lines
3.5 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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namespace AOC2017
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{
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class BScottDay8 : BScottSolution
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{
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public override string Name => "Day 8: I Heard You Like Registers";
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private const int ARG_REG = 0;
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private const int ARG_OP = 1;
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private const int ARG_VALUE = 2;
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private const int ARG_KEYWORD = 3;
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private const int ARG_COND_REG = 4;
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private const int ARG_COND = 5;
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private const int ARG_COND_VAL = 6;
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public override void Run()
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{
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string[] example = new string[]
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{
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"b inc 5 if a > 1",
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"a inc 1 if b < 5",
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"c dec -10 if a >= 1",
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"c inc -20 if c == 10"
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};
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Tuple<int, int> exampleResult = RunCpu(example);
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Console.WriteLine($"Part 1 Example Answer: {exampleResult.Item1}");
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Console.WriteLine($"Part 2 Example Answer: {exampleResult.Item2}");
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string[] input = File.ReadAllLines("BScottDay8.txt");
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Tuple<int, int> result = RunCpu(input);
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Console.WriteLine($"Part 1 Answer: {result.Item1}");
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Console.WriteLine($"Part 2 Answer: {result.Item2}");
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}
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static Tuple<int,int> RunCpu(string[] input)
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{
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int highestValue = 0;
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Dictionary<string, int> r = new Dictionary<string, int>();
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for (int i = 0; i < input.Length; i++)
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{
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string[] args = input[i].Split(' ');
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// create any missing registers
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if(!r.ContainsKey(args[ARG_REG]))
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r.Add(args[ARG_REG], 0);
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if (!r.ContainsKey(args[ARG_COND_REG]))
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r.Add(args[ARG_COND_REG], 0);
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// evaluate the condition
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int x = r[args[ARG_COND_REG]];
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int y = int.Parse(args[ARG_COND_VAL]);
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bool cond = false;
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switch (args[ARG_COND])
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{
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case ">":
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cond = x > y;
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break;
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case ">=":
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cond = x >= y;
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break;
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case "==":
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cond = x == y;
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break;
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case "<=":
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cond = x <= y;
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break;
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case "<":
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cond = x < y;
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break;
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case "!=":
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cond = x != y;
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break;
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}
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// execute the operation if the condition is met
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if (cond)
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{
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switch (args[ARG_OP])
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{
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case "inc":
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r[args[ARG_REG]] += int.Parse(args[ARG_VALUE]);
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break;
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case "dec":
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r[args[ARG_REG]] -= int.Parse(args[ARG_VALUE]);
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break;
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}
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// keep track of the highest register
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if (r[args[ARG_REG]] > highestValue)
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highestValue = r[args[ARG_REG]];
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}
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}
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return Tuple.Create(r.OrderByDescending(x => x.Value).First().Value, highestValue);
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}
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}
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}
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