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d8.csx
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d8.csx
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using System.IO;
using System.Collections.Generic;
var lines = File.ReadAllLines("d8.txt");
//--------------------------------- 1 ::: 1586
TryCheck(lines, out int result, out _);
Console.WriteLine("accumulator " + result);
//--------------------------------- 2 ::: 703
TryCheck(lines, out _, out Dictionary<int, (string, int)> nopJmp); //get affected only line numbers with nop/jmp
foreach (int i in nopJmp.Keys)
{
var (str, num) = nopJmp[i];
switch(str)
{
case "jmp":
Test(i, str, num, "nop");
break;
case "nop":
Test(i, str, num, "jmp");
break;
}
}
void Test(int currentLine, string str, int value, string replacement)
{
string[] strs = new string[lines.Length];
lines.CopyTo(strs, 0);
strs[currentLine] = $"{replacement} {value}";
if (TryCheck(strs, out int acc, out _)) {
Console.WriteLine("the acc is "+acc);
}
}
//--------------------------------- common
bool TryCheck(string[] data, out int accumulator, out Dictionary<int, (string, int)> nopJmp)
{
accumulator = 0;
HashSet<int> lineNumbers = new();
nopJmp = new();
int currentLine = 0;
bool isInRange = true;
while ( isInRange && !lineNumbers.Contains(currentLine))
{
lineNumbers.Add(currentLine);
var (command, value) = Parse(data[currentLine]);
switch (command) {
case "nop":
nopJmp.Add(currentLine, (command, value));
currentLine++;
break;
case "acc":
accumulator += value;
currentLine++;
break;
case "jmp":
nopJmp.Add(currentLine, (command, value));
currentLine += value;
break;
}
isInRange = (currentLine > 0 && currentLine < data.Length);
}
return !isInRange;
}
(string, int) Parse(string input)
{
var s = input.Split(" ");
return (s[0], int.Parse(s[1]));
}