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Day06.java
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Day06.java
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public class Day06 extends AbstractDay {
public Day06() {
super(6, true);
}
@Override
public void part1() {
long[] fishes = createFishes();
simulate(fishes, 80);
System.out.println("Part 1: " + countFishes(fishes));
}
@Override
public void part2() {
long[] fishes = createFishes();
simulate(fishes, 256);
System.out.println("Part 2: " + countFishes(fishes));
}
@Override
public void combined() {
long[] fishes = createFishes();
simulate(fishes, 80);
System.out.println("Part 1: " + countFishes(fishes));
simulate(fishes, 256-80);
System.out.println("Part 2: " + countFishes(fishes));
}
/**
* @return an array in which each element represents the number of fishes
* with the specific index as the days left to reproduce
*/
private long[] createFishes() {
long[] fishes = new long[9];
for (int n : intInput)
fishes[n]++;
return fishes;
}
private long countFishes(long[] fishes) {
long sum = 0;
for (long n : fishes)
sum += n;
return sum;
}
private void simulate(long[] fishes, int days) {
for (int d = 0; d < days; d++) {
long n0 = fishes[0];
System.arraycopy(fishes, 1, fishes, 0, fishes.length - 1);
fishes[8] = n0;
fishes[6] += n0;
}
}
}