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@dhoss
Created December 1, 2023 22:09
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AoC Day 1 Part 2
package in.stonecolddev;
import java.util.List;
import java.util.Map;
public class DayOne implements DayRunner {
public static String partOne(List<String> data) {
Integer sum = 0;
for (String line : data) {
Integer firstNumber = null;
Integer lastNumber = null;
Integer numbersSeen = 0;
for (char c : line.toCharArray()) {
if (Character.isDigit(c)) {
numbersSeen++;
Integer numericValue = Character.getNumericValue(c);
if (firstNumber == null) {
firstNumber = numericValue;
} else {
lastNumber = numericValue;
}
}
}
if (numbersSeen < 2) {
lastNumber = firstNumber;
}
sum += Integer.parseInt("%d%d".formatted(firstNumber, lastNumber));
}
return sum.toString();
}
public static String partTwo(List<String> data) {
Integer sum = 0;
for (String line : data) {
Integer firstNumber = null;
Integer lastNumber = null;
Integer numbersSeen = 0;
Map<String, Integer> numbers = Map.of(
"one", 1,
"two", 2,
"three", 3,
"four", 4,
"five", 5,
"six", 6,
"seven", 7,
"eight", 8,
"nine", 9);
for (String number : numbers.keySet().stream().sorted().toList()) {
System.out.printf("Checking %s for number %d%n", line, numbers.get(number));
if (line.toLowerCase().contains(number)) {
numbersSeen++;
Integer actualNumber = numbers.get(number);
if (firstNumber == null) {
firstNumber = actualNumber;
System.out.printf("%d is the first number%n", firstNumber);
} else {
lastNumber = actualNumber;
System.out.printf("%d is the last number%n", lastNumber);
}
}
}
for (char c : line.toCharArray()) {
if (Character.isDigit(c)) {
numbersSeen++;
if (firstNumber == null) {
firstNumber = Character.getNumericValue(c);
} else {
lastNumber = Character.getNumericValue(c);
}
}
}
if (numbersSeen < 2) {
lastNumber = firstNumber;
}
sum += Integer.parseInt("%d%d".formatted(firstNumber, lastNumber));
}
return sum.toString();
}
}
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