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namespace aoc2019;
public sealed class Day23 : Day
{
public Day23() : base(23, "Category Six")
{
}
public override string Part1()
{
var vms = Enumerable.Range(0, 50)
.Select((s, i) =>
{
var vm = new IntCodeVM(Input.First());
vm.Run(i);
return vm;
}).ToList();
while (true)
foreach (var vm in vms)
{
while (vm.output.Count > 0)
{
var destination = (int)vm.Result;
var x = vm.Result;
var y = vm.Result;
if (destination == 255) return $"{y}";
vms[destination].Run(x, y);
}
vm.Run(-1);
}
}
public override string Part2()
{
var vms = Enumerable.Range(0, 50)
.Select((s, i) =>
{
var vm = new IntCodeVM(Input.First());
vm.Run(i);
return vm;
}).ToList();
long natX = 0, natY = 0, lastYSent = -1;
while (true)
{
var numIdle = 0;
foreach (var vm in vms)
{
var isIdle = true;
while (vm.output.Count > 0)
{
var destination = (int)vm.Result;
var x = vm.Result;
var y = vm.Result;
if (destination == 255)
{
natX = x;
natY = y;
}
else
{
vms[destination].Run(x, y);
}
isIdle = false;
}
vm.Run(-1);
if (isIdle) numIdle++;
}
if (numIdle == 50)
{
if (natY == lastYSent) return $"{natY}";
vms[0].Run(natX, natY);
lastYSent = natY;
}
}
}
}
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