make more stupid assumptions
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ea4c15668f
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15b46e1975
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@ -11,6 +11,7 @@ type Parsed = Vec<Blueprint>;
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#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
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#[derive(Copy, Clone, PartialEq, Eq, Debug, Default)]
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struct Factory {
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struct Factory {
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minute: u32,
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minute: u32,
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waited: u32,
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ore: u32,
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ore: u32,
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ore_robot: u32,
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ore_robot: u32,
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clay: u32,
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clay: u32,
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@ -29,6 +30,7 @@ impl Factory {
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obsidian: self.obsidian + self.obsidian_robot,
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obsidian: self.obsidian + self.obsidian_robot,
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geode: self.geode + self.geode_robot,
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geode: self.geode + self.geode_robot,
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minute: self.minute + 1,
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minute: self.minute + 1,
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waited: self.waited + 1,
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..self
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..self
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}
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}
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}
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}
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@ -90,47 +92,54 @@ fn parse_input(raw: &str) -> Parsed {
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}
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}
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fn part1(parsed: &Parsed) -> u32 {
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fn part1(parsed: &Parsed) -> u32 {
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parsed.iter().map(|blueprint| max_geodes(Factory { ore_robot: 1, ..Default::default() }, blueprint, 24) * blueprint.number).sum()
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parsed.iter().map(|blueprint| max_geodes(Factory { ore_robot: 1, ..Default::default() }, blueprint, 3, 24) * blueprint.number).sum()
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}
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}
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fn part2(parsed: &Parsed) -> u32 {
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fn part2(parsed: &Parsed) -> u32 {
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parsed.iter().take(3).map(|blueprint| max_geodes(Factory { ore_robot: 1, ..Default::default() }, blueprint, 32)).product()
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parsed.iter().take(3).map(|blueprint| max_geodes(Factory { ore_robot: 1, ..Default::default() }, blueprint, 4, 32)).product()
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}
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}
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fn max_geodes(factory: Factory, bp: &Blueprint, limit: u32) -> u32 {
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fn max_geodes(factory: Factory, bp: &Blueprint, wait_limit: u32, limit: u32) -> u32 {
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if factory.minute == limit {
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if factory.minute == limit {
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return factory.geode;
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return factory.geode;
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}
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}
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if factory.can_afford(&bp.geode_robot) {
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if factory.can_afford(&bp.geode_robot) {
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return max_geodes(Factory { geode_robot: factory.geode_robot + 1, ..factory.pass_minute() } - bp.geode_robot, bp, limit);
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return max_geodes(
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Factory { geode_robot: factory.geode_robot + 1, waited: 0, ..factory.pass_minute() } - bp.geode_robot,
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bp,
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wait_limit,
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limit,
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);
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}
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}
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// This assumption holds for my input but not the test input.
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// This assumption (“if we can build an obsidian robot, we should”) holds for my input but not the test input.
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// Not entirely fair, but good enough until I figure out a better way.
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// Not entirely fair, but good enough until (or if at all) I figure out a better way.
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if factory.obsidian_robot < bp.geode_robot.obsidian && factory.can_afford(&bp.obsidian_robot) {
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if factory.obsidian_robot < bp.geode_robot.obsidian && factory.can_afford(&bp.obsidian_robot) {
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return max_geodes(Factory { obsidian_robot: factory.obsidian_robot + 1, ..factory.pass_minute() } - bp.obsidian_robot, bp, limit);
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return max_geodes(
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Factory { obsidian_robot: factory.obsidian_robot + 1, waited: 0, ..factory.pass_minute() } - bp.obsidian_robot,
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bp,
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wait_limit,
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limit,
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);
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}
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}
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let mut outcomes = Vec::with_capacity(3);
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let mut outcomes = Vec::with_capacity(3);
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if factory.ore_robot < bp.max_ore && factory.can_afford(&bp.ore_robot) {
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if factory.ore_robot < bp.max_ore && factory.can_afford(&bp.ore_robot) {
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outcomes.push(Factory { ore_robot: factory.ore_robot + 1, ..factory.pass_minute() } - bp.ore_robot);
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outcomes.push(Factory { ore_robot: factory.ore_robot + 1, waited: 0, ..factory.pass_minute() } - bp.ore_robot);
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}
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}
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if factory.clay_robot < bp.obsidian_robot.clay && factory.can_afford(&bp.clay_robot) {
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if factory.clay_robot < bp.obsidian_robot.clay && factory.can_afford(&bp.clay_robot) {
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outcomes.push(Factory { clay_robot: factory.clay_robot + 1, ..factory.pass_minute() } - bp.clay_robot);
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outcomes.push(Factory { clay_robot: factory.clay_robot + 1, waited: 0, ..factory.pass_minute() } - bp.clay_robot);
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}
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}
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// There seem to be steps where doing nothing is the right choice even if we could produce
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if outcomes.is_empty() || factory.waited < wait_limit {
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// another robot according to the rules above. If I could eliminate this, the number of tested
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outcomes.push(factory.pass_minute());
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// lines is reduce by a factor of ~1_000_000
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}
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outcomes.push(factory.pass_minute());
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outcomes.into_iter().take(2).map(|f| max_geodes(f, bp, wait_limit, limit)).max().unwrap()
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outcomes.into_iter().map(|f| max_geodes(f, bp, limit)).max().unwrap()
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}
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}
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boilerplate! {
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boilerplate! {
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TEST_INPUT == "\
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TEST_INPUT == "\
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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.
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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.
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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.",
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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.",
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tests: {
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tests: { part1: { TEST_INPUT => 33 } },
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part1: { TEST_INPUT => 33 },
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// part2: { TEST_INPUT => 3472 },
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},
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bench1 == 1150,
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bench1 == 1150,
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bench2 == 37367,
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bench2 == 37367,
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bench_parse: Vec::len => 30,
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bench_parse: Vec::len => 30,
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