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Day 15 solution

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Pretty rough, this is my initial solve. Part 2 needs to be sped up, but is currently 3 seconds on my PC and my dataset.
This commit is contained in:
Chris Pickett
2022-12-15 14:12:28 -06:00
parent ea2626cd75
commit e14f71484f
4 changed files with 215 additions and 100 deletions
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1
advent-of-code-2022.csproj
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@ -66,6 +66,7 @@
<EmbeddedResource Include="inputs\14a.txt" /> <EmbeddedResource Include="inputs\14a.txt" />
<EmbeddedResource Include="inputs\15.txt" /> <EmbeddedResource Include="inputs\15.txt" />
<None Remove="inputs\16.txt" /> <None Remove="inputs\16.txt" />
<EmbeddedResource Include="inputs\15a.txt" />
<EmbeddedResource Include="inputs\16.txt" /> <EmbeddedResource Include="inputs\16.txt" />
<None Remove="inputs\17.txt" /> <None Remove="inputs\17.txt" />
<EmbeddedResource Include="inputs\17.txt" /> <EmbeddedResource Include="inputs\17.txt" />

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inputs/15.txt
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@ -1,100 +1,24 @@
1611211251115912246318291351712232221112291225613417396681596333922111215456315139438667612549131941 Sensor at x=3988693, y=3986119: closest beacon is at x=3979063, y=3856315
8932114117311575142243171112817226232119863432221628251318261661191181914131437113236733419511921113 Sensor at x=1129181, y=241785: closest beacon is at x=1973630, y=-98830
3311112319881299126138992415428219269217291531671353324111619434247412712947881243552169128135998191 Sensor at x=2761889, y=2453622: closest beacon is at x=2803715, y=2643139
2519114235316687331115265422264283428712233596112945181199111152385542971123592212311162661421311721 Sensor at x=3805407, y=3099635: closest beacon is at x=3744251, y=2600851
1382461356912146511842319166317957261971229314621394111613112824713571111351337871924493182613432256 Sensor at x=3835655, y=3999745: closest beacon is at x=3979063, y=3856315
5114711863712392214191153831119241119273761167659431242745167938327311529213316381831112912163261726 Sensor at x=3468377, y=3661078: closest beacon is at x=3979063, y=3856315
2133551185321341121928148131837914911121496412338312251193532149215486158331691323639142596645122111 Sensor at x=1807102, y=3829998: closest beacon is at x=2445544, y=3467698
1711569246152189932234173111631965298489584111312431711132154431213342671841478551877131719115182119 Sensor at x=2774374, y=551040: closest beacon is at x=1973630, y=-98830
9122149481122135915537133111611623234859281656147415218627843119137181419118649192615139557824552374 Sensor at x=2004588, y=2577348: closest beacon is at x=2803715, y=2643139
4911523117167829117391221297181113512124212111923552525313422843324691463742313599316131243752253684 Sensor at x=2949255, y=3611925: closest beacon is at x=2445544, y=3467698
5414417111829212132324935672161432171112458323991236122391625212798322322229323469836523865422521221 Sensor at x=2645982, y=3991988: closest beacon is at x=2445544, y=3467698
6411419531652111283121918212256619646644819331891775249312384935234199392273946162322562911231297881 Sensor at x=3444780, y=2880445: closest beacon is at x=3744251, y=2600851
2128729415918832321163943197715389275338541111113951736132921133694314913712199421116532211811753165 Sensor at x=3926452, y=2231046: closest beacon is at x=3744251, y=2600851
4155523539192111125923842191181996311591936139684321893331918133513841219121725123321178229123219131 Sensor at x=3052632, y=2882560: closest beacon is at x=2803715, y=2643139
9479285145913396251237128221525362732111772949515352815229526959117541561311121638422294521121411186 Sensor at x=3994992, y=2720288: closest beacon is at x=3744251, y=2600851
5361431713278166762792211821131161119224248551162317662211612621114112115836126641192459222212113327 Sensor at x=3368581, y=1443706: closest beacon is at x=3744251, y=2600851
2494757131117376374123218127935211421161131174291195896246235724212194112343914127851943372836444151 Sensor at x=2161363, y=1856161: closest beacon is at x=1163688, y=2000000
1126333352124135364191315839321423442739332131119751918814928429539165252271192793931114699193141352 Sensor at x=3994153, y=3414445: closest beacon is at x=3979063, y=3856315
7993476425955975972523385123991731131227922419193851353711242334711754713176123716252617514911343624 Sensor at x=2541906, y=2965730: closest beacon is at x=2803715, y=2643139
3837633187113119153159621661333345499733158211731234919113375757122732611351412411224458275312113323 Sensor at x=600169, y=3131140: closest beacon is at x=1163688, y=2000000
1213823111311973291166152828314699226174131294182312323228596132434921226112127148541491997311661191 Sensor at x=163617, y=1082438: closest beacon is at x=1163688, y=2000000
1941285148119221112175922114193977135939237888391111177353313353689991314261133271214122191599821736 Sensor at x=3728368, y=140105: closest beacon is at x=3732654, y=-724773
8119315121159215398141511314171194211295753133431893571741116342288969422281953477211127122222213973 Sensor at x=1187681, y=2105247: closest beacon is at x=1163688, y=2000000
3211111167199143898758411863181981129346176513322864719479111538191232861611116115119312419947645553 Sensor at x=2327144, y=3342616: closest beacon is at x=2445544, y=3467698
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Sensor at x=2, y=18: closest beacon is at x=-2, y=15
Sensor at x=9, y=16: closest beacon is at x=10, y=16
Sensor at x=13, y=2: closest beacon is at x=15, y=3
Sensor at x=12, y=14: closest beacon is at x=10, y=16
Sensor at x=10, y=20: closest beacon is at x=10, y=16
Sensor at x=14, y=17: closest beacon is at x=10, y=16
Sensor at x=8, y=7: closest beacon is at x=2, y=10
Sensor at x=2, y=0: closest beacon is at x=2, y=10
Sensor at x=0, y=11: closest beacon is at x=2, y=10
Sensor at x=20, y=14: closest beacon is at x=25, y=17
Sensor at x=17, y=20: closest beacon is at x=21, y=22
Sensor at x=16, y=7: closest beacon is at x=15, y=3
Sensor at x=14, y=3: closest beacon is at x=15, y=3
Sensor at x=20, y=1: closest beacon is at x=15, y=3

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using System.Drawing;
using System.Text.RegularExpressions;
using aoc2022.Util;
namespace aoc2022;
internal class Day15 : Day
{
private List<ivec2> knownSensors = new();
private List<ivec2> knownBeacons = new();
internal override void Parse()
{
Regex r = new(@"=(-?\d+)", RegexOptions.Compiled);
foreach (var line in Parsing.ReadAllLines("15"))
{
var m = r.Matches(line);
knownSensors.Add(new ivec2(int.Parse(m[0].Groups[1].Value), int.Parse(m[1].Groups[1].Value)));
knownBeacons.Add(new ivec2(int.Parse(m[2].Groups[1].Value), int.Parse(m[3].Groups[1].Value)));
}
}
private bool IsReachableFromSensor(ivec2 sensor, int maxDist, ivec2 point)
{
return point.ManhattanDistanceTo(sensor) <= maxDist;
}
private bool IsReachableFromAnySensor(ivec2 point)
{
for (int i = 0; i < knownSensors.Count; i++)
{
var s = knownSensors[i];
var b = knownBeacons[i];
var dist = s.ManhattanDistanceTo(b);
if (IsReachableFromSensor(s, dist, point))
{
return true;
}
}
return false;
}
internal override string Part1()
{
int interestedY = 10;
HashSet<ivec2> emptySpace = new();
for (int i = 0; i < knownSensors.Count; i++)
{
var s = knownSensors[i];
var b = knownBeacons[i];
var dist = s.ManhattanDistanceTo(b);
for (int j = 0; ; j++)
{
var testVec = new ivec2(s.x + j, interestedY);
if (testVec.ManhattanDistanceTo(s) <= dist)
{
if (!knownBeacons.Contains(testVec))
{
emptySpace.Add(testVec);
}
}
else
{
break;
}
}
for (int j = 0; ; j++)
{
var testVec = new ivec2(s.x - j, interestedY);
if (testVec.ManhattanDistanceTo(s) <= dist)
{
if (!knownBeacons.Contains(testVec))
{
emptySpace.Add(testVec);
}
}
else
{
break;
}
}
}
return $"Empty spaces at y={interestedY:N0}: <+white>{emptySpace.Count}";
}
internal override string Part2()
{
int pointsTested = 0;
int max = 4000000;
ivec2? answer = null;
for (int i = 0; i < knownSensors.Count; i++)
{
var s = knownSensors[i];
var b = knownBeacons[i];
var exclusionDist = s.ManhattanDistanceTo(b);
var top = new ivec2(s.x, s.y - exclusionDist - 1);
var dir = new ivec2(-1, 1);
var pt = top;
while (answer == null)
{
pointsTested++;
if (pt.x >= 0 && pt.y >= 0 && pt.x <= max && pt.y <= max && !IsReachableFromAnySensor(pt))
{
answer = pt;
break;
}
if (pt.y == s.y)
{
break;
}
pt += dir;
}
dir.x = 1;
while (answer == null)
{
pointsTested++;
if (pt.x >= 0 && pt.y >= 0 && pt.x <= max && pt.y <= max && !IsReachableFromAnySensor(pt))
{
answer = pt;
break;
}
if (pt.x == s.x)
{
break;
}
pt += dir;
}
dir.y = -1;
while (answer == null)
{
pointsTested++;
if (pt.x >= 0 && pt.y >= 0 && pt.x <= max && pt.y <= max && !IsReachableFromAnySensor(pt))
{
answer = pt;
break;
}
if (pt.y == s.y)
{
break;
}
pt += dir;
}
dir.x = -1;
while (answer == null)
{
pointsTested++;
if (pt.x >= 0 && pt.y >= 0 && pt.x <= max && pt.y <= max && !IsReachableFromAnySensor(pt))
{
answer = pt;
break;
}
if (pt == top)
{
break;
}
pt += dir;
}
}
return $"After testing {pointsTested:N0} points, found distress beacon at {answer} with tuning frequency: <+white>{(answer!.Value.x * 4000000L) + answer.Value.y}";
}
}