adventofcode/src/main/java/AoC2015_08.java at main · pareronia/adventofcode · GitHub

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import static com.github.pareronia.aoc.StringUtils.countMatches;

import java.util.List;

import java.util.regex.Pattern;

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

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

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

public class AoC2015_08 extends SolutionBase<List<String>, Integer, Integer> {

private static final Pattern HEX = Pattern.compile("\\\\x[0-9a-f]{2}");

private AoC2015_08(final boolean debug) {

super(debug);

}

public static final AoC2015_08 create() {

return new AoC2015_08(false);

}

public static final AoC2015_08 createDebug() {

return new AoC2015_08(true);

}

@Override

protected List<String> parseInput(final List<String> inputs) {

return inputs;

}

private int solve(final List<String> inputs, final Mode mode) {

return inputs.stream().mapToInt(mode::overhead).sum();

}

@Override

public Integer solvePart1(final List<String> inputs) {

return solve(inputs, Mode.DECODE);

}

@Override

public Integer solvePart2(final List<String> inputs) {

return solve(inputs, Mode.ENCODE);

}

private enum Mode {

DECODE, ENCODE;

public int overhead(String str) {

return switch (this) {

case DECODE -> {

assert str.charAt(0) == '"' && str.charAt(str.length() - 1) == '"';

int cnt = 2;

while (str.contains("\\\\")) {

str = str.replaceFirst("[\\\\]{2}", "");

cnt++;

}

cnt += countMatches(str, "\\\"");

cnt += 3 * HEX.matcher(str).results().count();

yield cnt;

}

case ENCODE ->

2 + countMatches(str, "\\") + countMatches(str, "\"");

};

}

@Override

@Samples({

@Sample(method = "part1", input = TEST, expected = "12"),

@Sample(method = "part2", input = TEST, expected = "19"),

})

public void samples() {

}

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

AoC2015_08.create().run();

}

private static final String TEST =

"""

"abc"

"aaa\\"aaa"

"\\x27\"\

""";

}

adventofcode/src/main/java/AoC2015_08.java at main · pareronia/adventofcode · GitHub

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