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Day 10 + small perf checks

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This commit is contained in:
Chris Pickett
2020-12-10 15:05:09 -06:00
parent 921c59ffca
commit 78e2ce126d
5 changed files with 182 additions and 0 deletions
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90
10input.txt Normal file
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3
2020.csproj
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@ -38,6 +38,9 @@
<None Update="09input.txt">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="10input.txt">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
</ItemGroup>
</Project>

3
Program.cs
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@ -4,6 +4,7 @@
{
static void Main(string[] args)
{
var start = System.DateTime.Now;
Q01.Go();
Q02.Go();
Q03.Go();
@ -13,6 +14,8 @@
Q07.Go();
Q08.Go();
Q09.Go();
Q10.Go();
System.Diagnostics.Debug.WriteLine($"Total time={(System.DateTime.Now - start).TotalMilliseconds}ms");
}
}
}

8
Q09.cs
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@ -13,9 +13,17 @@ namespace _2020
public static void Go()
{
var start = DateTime.Now;
MakeList();
Debug.WriteLine($"Q09 MakeList took {(DateTime.Now - start).TotalMilliseconds}ms");
var p1start = DateTime.Now;
Part1();
Debug.WriteLine($"Q09 part1 took {(DateTime.Now - p1start).TotalMilliseconds}ms");
var p2start = DateTime.Now;
Part2();
Debug.WriteLine($"Q09 part2 took {(DateTime.Now - p2start).TotalMilliseconds}ms");
Debug.WriteLine($"Q09 took {(DateTime.Now - start).TotalMilliseconds}ms");
}
static void MakeList()

78
Q10.cs Normal file
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
namespace _2020
{
class Q10
{
static List<long> list = new List<long>();
static List<long> sortedList = null;
public static void Go()
{
var start = DateTime.Now;
MakeList();
Debug.WriteLine($"Q10 MakeList took {(DateTime.Now - start).TotalMilliseconds}ms");
var p1start = DateTime.Now;
Part1();
Debug.WriteLine($"Q10 part1 took {(DateTime.Now - p1start).TotalMilliseconds}ms");
var p2start = DateTime.Now;
Part2();
Debug.WriteLine($"Q10 part2 took {(DateTime.Now - p2start).TotalMilliseconds}ms");
Debug.WriteLine($"Q10 took {(DateTime.Now - start).TotalMilliseconds}ms");
}
static void MakeList()
{
list.Add(0);
foreach (var line in File.ReadAllLines("10input.txt"))
{
list.Add(Convert.ToInt64(line));
}
sortedList = new List<long>(list);
sortedList.Sort();
sortedList.Add(sortedList[^1] + 3);
}
static void Part1()
{
var diffs = new int[3];
for (int i = 1; i < sortedList.Count; i++)
{
diffs[sortedList[i] - sortedList[i - 1] - 1]++;
}
Debug.WriteLine($"Q10Part1: device joltage={sortedList[^1]}, diffs by 1={diffs[0]}, diffs by 3={diffs[2]}, multiplied={diffs[0] * diffs[2]}");
}
static void Part2()
{
var pathsToIndices = new List<long>();
pathsToIndices.Add(1);
for (int i = 1; i < sortedList.Count; i++)
{
long pathLen = 0;
for (int j = i - 1; j >= 0; j--)
{
if (sortedList[j] + 3 >= sortedList[i])
{
pathLen += pathsToIndices[j];
}
else
{
break;
}
}
pathsToIndices.Add(pathLen);
}
Debug.WriteLine($"Q10Part2: combinations={pathsToIndices[^1]}");
}
}
}