adventofcode/src/main/java/AoC2016_03.java at main · pareronia/adventofcode · GitHub

History

77 lines (64 loc) · 2.15 KB

Raw

import static com.github.pareronia.aoc.IntegerSequence.Range.range;

import java.util.Arrays;

import java.util.List;

import com.github.pareronia.aoc.StringUtils;

import com.github.pareronia.aoc.solution.Sample;

import com.github.pareronia.aoc.solution.Samples;

import com.github.pareronia.aoc.solution.SolutionBase;

public class AoC2016_03 extends SolutionBase<int[][], Integer, Integer> {

private AoC2016_03(final boolean debug) {

super(debug);

}

public static final AoC2016_03 create() {

return new AoC2016_03(false);

}

public static final AoC2016_03 createDebug() {

return new AoC2016_03(true);

}

@Override

protected int[][] parseInput(final List<String> inputs) {

return inputs.stream()

.map(s -> Arrays.stream(s.split(" "))

.filter(StringUtils::isNotBlank)

.mapToInt(Integer::parseInt)

.toArray())

.toArray(int[][]::new);

}

@Override

public Integer solvePart1(final int[][] nums) {

return (int) Arrays.stream(nums)

.map(t -> new Triangle(t[0], t[1], t[2]))

.filter(Triangle::valid)

.count();

}

@Override

public Integer solvePart2(final int[][] nums) {

return range(0, nums.length, 3).intStream()

.map(i -> (int) range(3).intStream()

.mapToObj(j -> new Triangle(

nums[i][j], nums[i + 1][j], nums[i + 2][j]))

.filter(Triangle::valid)

.count())

.sum();

}

@Samples({

@Sample(method = "part1", input = TEST1, expected = "0"),

@Sample(method = "part1", input = TEST2, expected = "1"),

@Sample(method = "part2", input = TEST3, expected = "2"),

})

public static void main(final String[] args) throws Exception {

AoC2016_03.create().run();

}

private static final String TEST1 = " 5 10 25";

private static final String TEST2 = " 3 4 5";

private static final String TEST3 = """

5 3 6

10 4 8

25 5 10

""";

record Triangle(int a, int b, int c) {

public boolean valid() {

return a + b > c && a + c > b && b + c > a;

}

adventofcode/src/main/java/AoC2016_03.java at main · pareronia/adventofcode · GitHub

Expand file tree

Breadcrumbs

AoC2016_03.java

Latest commit

History

Breadcrumbs

AoC2016_03.java

File metadata and controls