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AOC2022 day19
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// AOC 2022, Day 19: Not Enough Minerals | |
// Produce some machines that produce resources in a horrible network :-) | |
// 1) Find best results for a long list. | |
// 2) Now for a short list over a longer time. | |
// https://dartpad.dev/?id=741c3d8304eb54a167e065c0702eb38f | |
import 'dart:math'; | |
import 'package:collection/collection.dart'; | |
extension IntegerRangeExtension on int { | |
List<int> to(int end, {int step = 1}) => | |
List.generate((end - this + (step - 1)) ~/ step, (i) => i * step + this); | |
} | |
var ore = 0, clay = 1, obsidian = 2, geode = 3; | |
class Blueprint { | |
int number; | |
List<List<int>> costs = [[], [], [], []]; | |
Blueprint(this.number, this.costs); | |
} | |
class State { | |
int time; | |
List<int> robots = [1, 0, 0, 0]; | |
List<int> stocks = [0, 0, 0, 0]; | |
List<bool> wasIdleInstead = [false, false, false, false]; | |
State(this.time); | |
State.copyFrom(State other) | |
: time = other.time, | |
robots = other.robots.toList(), | |
stocks = other.stocks.toList(); | |
canBuildRobot(int r, Blueprint bp) => | |
!wasIdleInstead[r] && 0.to(4).every((i) => stocks[i] >= bp.costs[r][i]); | |
buildRobot(int r, Blueprint bp) { | |
robots[r] += 1; | |
for (var i in 0.to(4)) { | |
stocks[i] -= bp.costs[r][i]; | |
} | |
} | |
@override | |
int get hashCode => Object.hash(time, robots, stocks); | |
@override | |
bool operator ==(Object other) => | |
(other is State) && | |
time == other.time && | |
0.to(robots.length).every((e) => robots[e] == other.robots[e]) && | |
0.to(stocks.length).every((e) => stocks[e] == other.stocks[e]); | |
} | |
var debug = false; | |
Blueprint read(String line) { | |
var reD = RegExp(r'\d+'); | |
var ms = reD.allMatches(line).map((m) => int.parse(m[0]!)).toList(); | |
return Blueprint(ms[0], [ | |
[ms[1], 0, 0, 0], | |
[ms[2], 0, 0, 0], | |
[ms[3], ms[4], 0, 0], | |
[ms[5], 0, ms[6], 0] | |
]); | |
} | |
List<int> sums(List<int> a, List<int> b) => | |
[0, 1, 2, 3].map((e) => a[e] + b[e]).toList(); | |
int getMaxGeodes(Blueprint bp, int timeLimit) { | |
var best = 0; | |
var q = QueueList.from([State(timeLimit)]); | |
var seen = <int>{}; | |
while (q.isNotEmpty) { | |
var curr = q.removeFirst(); | |
if (seen.contains(curr.hashCode)) { | |
continue; | |
} | |
seen.add(curr.hashCode); | |
if (curr.time == 0) { | |
if (curr.stocks[geode] > best) { | |
best = curr.stocks[geode]; | |
} | |
continue; | |
} | |
// can we prune? | |
//if we magically made geode bots every round, could we catch up with best? | |
if (curr.stocks[geode] + | |
curr.time * curr.robots[geode] + | |
max((curr.time - 1) * (curr.time - 2) ~/ 2, 0) < | |
best) { | |
continue; | |
} | |
var nextState = State.copyFrom(curr) | |
..time -= 1 | |
..stocks = sums(curr.stocks, curr.robots); | |
// What should we build next? | |
//Always build geode | |
var buildGeode = curr.canBuildRobot(geode, bp); | |
if (buildGeode) { | |
q.add(State.copyFrom(nextState)..buildRobot(geode, bp)); | |
} | |
// Geode >>> Obs, plus don't need too many | |
var buildObs = !buildGeode && | |
curr.robots[obsidian] < bp.costs[geode][obsidian] && | |
curr.canBuildRobot(obsidian, bp); | |
if (buildObs) { | |
q.add(State.copyFrom(nextState)..buildRobot(obsidian, bp)); | |
} | |
// Only build clay if we need it to feed obsidians | |
var buildClay = !buildGeode && | |
!buildObs && | |
curr.robots[clay] < bp.costs[obsidian][clay] && | |
curr.canBuildRobot(clay, bp); | |
if (buildClay) { | |
q.add(State.copyFrom(nextState)..buildRobot(clay, bp)); | |
} | |
// Only build clay if we need it to feed any of the others | |
var buildOre = !buildGeode && | |
!buildObs && | |
// Next line based on | |
// https://old.reddit.com/r/adventofcode/comments/zpihwi/2022_day_19_solutions/j0w8ujl/ | |
// may be data dependent | |
curr.robots[clay] < 2 && | |
(curr.robots[ore] < bp.costs[geode][ore] || | |
curr.robots[ore] < bp.costs[obsidian][ore] || | |
curr.robots[ore] < bp.costs[clay][ore]) && | |
curr.canBuildRobot(ore, bp); | |
if (buildOre) { | |
q.add(State.copyFrom(nextState)..buildRobot(ore, bp)); | |
} | |
// Dunno about these numbers... May be data-dependent | |
var canIdle = !buildGeode && | |
(curr.stocks[ore] < 1 * bp.costs[geode][ore] || | |
curr.stocks[ore] < 1 * bp.costs[obsidian][ore] || | |
curr.stocks[ore] < 2 * bp.costs[clay][ore]) && | |
curr.stocks[clay] < 3 * bp.costs[obsidian][clay]; | |
if (canIdle) { | |
// https://old.reddit.com/r/adventofcode/comments/zpihwi/2022_day_19_solutions/j0vvtdt/ | |
nextState.wasIdleInstead = [buildOre, buildClay, buildObs, buildGeode]; | |
q.add(nextState); | |
} | |
} | |
return best; | |
} | |
part1(List<String> lines) => | |
lines.map(read).map((e) => getMaxGeodes(e, 24) * e.number).sum; | |
part2(List<String> lines) => | |
lines.take(3).map((e) => getMaxGeodes(read(e), 32)).reduce((s, t) => s * t); | |
var testdata = [ | |
"Blueprint 1: Each ore robot costs 4 ore. Each clay robot costs 2 ore. Each obsidian robot costs 3 ore and 14 clay. Each geode robot costs 2 ore and 7 obsidian.", | |
"Blueprint 2: Each ore robot costs 2 ore. Each clay robot costs 3 ore. Each obsidian robot costs 3 ore and 8 clay. Each geode robot costs 3 ore and 12 obsidian." | |
]; | |
void main(List<String> args) { | |
var dt = DateTime.now(); | |
assert(part1(testdata) == 33); | |
assert(part2(testdata) == 3348); | |
var rt = DateTime.now().difference(dt).inMilliseconds; | |
print('tests succeeded in $rt ms'); | |
} |
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