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package at.kocmana.aoc23.common; | ||
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import static java.util.function.Predicate.not; | ||
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import java.util.Arrays; | ||
import java.util.List; | ||
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public class Parser { | ||
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private Parser() { | ||
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} | ||
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public static List<Integer> toNumberList(String input) { | ||
return Arrays.stream(input.trim().split("\\s+")) | ||
.filter(not(String::isBlank)) | ||
.map(Integer::parseInt) | ||
.toList(); | ||
} | ||
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} |
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package at.kocmana.aoc23.dec06; | ||
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import static at.kocmana.aoc23.common.Parser.toNumberList; | ||
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import java.util.List; | ||
import java.util.stream.IntStream; | ||
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public class WaitForIt { | ||
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public static void main(String[] args) { | ||
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} | ||
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static List<Race> parseRaces(String input) { | ||
input = input.replace("Time:", "") | ||
.replace("Distance:", "") | ||
.trim(); | ||
var lines = input.split("\\n"); | ||
var times = toNumberList(lines[0]); | ||
var distances = toNumberList(lines[1]); | ||
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assert (times.size() == distances.size()); | ||
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return IntStream.range(0, times.size()) | ||
.mapToObj(i -> new Race(times.get(i), distances.get(i))) | ||
.toList(); | ||
} | ||
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static long assessNumberOfPossibleWins(Race race) { | ||
return IntStream.range(1, race.time()) | ||
.mapToObj(i -> { | ||
var distance = calculateDistance(i, race.time()); | ||
return new RaceOutcome( | ||
distance, | ||
isWin(race.distanceToBeat(), distance) | ||
); | ||
}) | ||
.filter(RaceOutcome::isWin) | ||
.count(); | ||
} | ||
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static int calculateDistance(int durationButtonPressed, int totalRaceDuration) { | ||
var remainingTime = totalRaceDuration - durationButtonPressed; | ||
var speed = durationButtonPressed; | ||
return speed * remainingTime; | ||
} | ||
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static boolean isWin(int distanceToBeat, int distance) { | ||
return distanceToBeat < distance; | ||
} | ||
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long generateNumberOfWays(String input) { | ||
return parseRaces(input).stream() | ||
.map(WaitForIt::assessNumberOfPossibleWins) | ||
.reduce(1L, (i, j) -> i * j); | ||
} | ||
} | ||
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record Race( | ||
int time, | ||
int distanceToBeat | ||
) { | ||
} | ||
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record RaceOutcome( | ||
int distance, | ||
boolean isWin | ||
) { | ||
} |
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package at.kocmana.aoc23.dec06; | ||
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import static org.assertj.core.api.Assertions.assertThat; | ||
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import org.junit.jupiter.api.Test; | ||
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class WaitForItTest { | ||
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@Test | ||
void canParse() { | ||
//given | ||
var input = """ | ||
Time: 7 15 30 | ||
Distance: 9 40 200 | ||
"""; | ||
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//when | ||
var actualResult = WaitForIt.parseRaces(input); | ||
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//then | ||
assertThat(actualResult).isNotNull() | ||
.hasSize(3) | ||
.contains( | ||
new Race(7, 9), | ||
new Race(15, 40), | ||
new Race(30, 200) | ||
); | ||
} | ||
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} |