87 lines
1.8 KiB
C#
87 lines
1.8 KiB
C#
using System;
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using System.IO;
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using System.Collections.Generic;
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namespace day8 {
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class Program {
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static void Main(string[] args) {
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//PartOne();
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PartTwo();
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}
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static void PartOne() {
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List<string> lines = new List<string>(File.ReadAllLines("input")) { "hlt" };
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int acc = 0, i = 0;
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// Halt when reaching HLT
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while(lines[i] != "hlt") {
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var parts = lines[i].Split(" ");
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var instruction = parts[0];
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var intval = int.Parse(parts[1]);
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// Halt when we go back to this instruction
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lines[i] = "hlt";
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// Increase accumilator
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if(instruction == "acc") acc += intval;
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// Do the jump
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if(instruction == "jmp") i += intval;
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else i++;
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}
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Console.WriteLine($"The value of the accumilator is {acc}");
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}
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static void PartTwo() {
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var lines = File.ReadAllLines("input");
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for(var i=0; i<lines.Length; i++) {
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var parts = lines[i].Split(" ");
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var instruction = parts[0];
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var intval = int.Parse(parts[1]);
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if(instruction == "acc")
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continue;
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var clone = new List<string>(lines);
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clone[i] = instruction == "jmp" ? $"nop {intval}" : $"jmp {intval}";
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try {
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var result = DoTheThing(clone);
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Console.WriteLine($"Found that instruction {i} fixes the loop, accumilator end up being {result}.");
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return;
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} catch { }
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}
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}
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static int DoTheThing(List<string> lines) {
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int acc = 0, i = 0;
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// Halt when reaching HLT
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while(lines[i] != "hlt") {
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var parts = lines[i].Split(" ");
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var instruction = parts[0];
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var intval = int.Parse(parts[1]);
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// Halt when we go back to this instruction
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lines[i] = "hlt";
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// Increase accumilator
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if(instruction == "acc") acc += intval;
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// Do the jump
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if(instruction == "jmp") i += intval;
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else i++;
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if(i >= lines.Count) return acc;
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}
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throw new Exception("Lmaoo this isn't it");
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}
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} // class
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} // namespace
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