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feat(*): Update 2021-06 files (part 1 working, part 2 not I think, but unable to test on laptop due to CPU limitations)

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This resolves the out of memory issue, but still takes too long to run. It's either CPU or IO bound.
This commit is contained in:
Josh Creek
2021-12-06 13:09:24 +00:00
committed by GitHub
parent 3feeeb566c
commit 259637aa6e
7 changed files with 216 additions and 14 deletions
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2021/06/Program.cs
+71 -14
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@@ -23,18 +23,18 @@
Console.WriteLine($"Day: {currentDay} - there are {lanternFishPopulation.Count()} lantern fish");
for (int i = 0; i < lanternFishPopulation.Count; i++)
{
switch(lanternFishPopulation[i])
switch (lanternFishPopulation[i])
{
case 0:
// its internal timer would reset to 6, and it would create a new lanternfish with an internal timer of 8.
lanternFishPopulation[i] = 6;
// Adding a new one with 9 though it should be 8 as this loop will catch new fish and decrement them. It's dirty, but fast way to solve the issue
lanternFishPopulation.Add(9);
break;
default:
// remove one day from the fish's countdown
lanternFishPopulation[i] -= 1;
break;
case 0:
// its internal timer would reset to 6, and it would create a new lanternfish with an internal timer of 8.
lanternFishPopulation[i] = 6;
// Adding a new one with 9 though it should be 8 as this loop will catch new fish and decrement them. It's dirty, but fast way to solve the issue
lanternFishPopulation.Add(9);
break;
default:
// remove one day from the fish's countdown
lanternFishPopulation[i] -= 1;
break;
}
}
@@ -42,6 +42,58 @@
}
}
static void SimulateLanternFishBigDatasets(ref List<int> lanternFishPopulation, int daysToSimulate)
{
// A lanternfish that creates a new fish resets its timer to 6, not 7 (because 0 is included as a valid timer value). The new lanternfish starts with an internal timer of 8 and does not start counting down until the next day.
// Store dataset into db
using (var db = new FishContext())
{
foreach (var fish in lanternFishPopulation)
{
db.Add(new Fish { InternalTimer = fish });
db.SaveChanges();
}
}
int currentDay = 1;
while (currentDay <= daysToSimulate)
{
using (var db = new FishContext())
{
int fishCount = db.Fishes.Count();
Console.WriteLine($"Day: {currentDay} - there are {fishCount} lantern fish");
List<int> fishIds = db.Fishes.Select(x => x.FishId).ToList();
foreach (int fishId in fishIds)
{
Fish fish = db.Fishes.First(x => x.FishId == fishId);
switch (fish.InternalTimer)
{
case 0:
// its internal timer would reset to 6, and it would create a new lanternfish with an internal timer of 8.
fish.InternalTimer = 6;
// Adding a new one with 9 though it should be 8 as this loop will catch new fish and decrement them. It's dirty, but fast way to solve the issue
db.Add(new Fish { InternalTimer = 9 });
break;
default:
// remove one day from the fish's countdown
fish.InternalTimer -= 1;
break;
}
}
db.SaveChanges();
}
currentDay += 1;
}
}
static void Part1(List<int> lanternFish)
{
SimulateLanternFish(ref lanternFish, 80);
@@ -51,11 +103,16 @@
static void Part2(List<int> lanternFish)
{
SimulateLanternFish(ref lanternFish, 256);
SimulateLanternFishBigDatasets(ref lanternFish, 256);
// TODO - redo this using a database for large datasets, and entity framework, so as to avoid the HUGE memory usage
Console.WriteLine($"After 256 days there are {lanternFish.Count()} lantern fish.");
using (var db = new FishContext())
{
int fishCount = db.Fishes.Count();
Console.WriteLine($"After 256 days there are {fishCount} lantern fish.");
}
}
}
}