AdventOfCode/Trebuchet/TrebuchetPartTwo.java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Map;

public class TrebuchetPartTwo {
  public static void main(String[] args) {
    // Mapping of words to string digits
    HashMap<String, String> stringToDigit = new HashMap<>();
    stringToDigit.put("one", "1");
    stringToDigit.put("two", "2");
    stringToDigit.put("three", "3");
    stringToDigit.put("four", "4");
    stringToDigit.put("five", "5");
    stringToDigit.put("six", "6");
    stringToDigit.put("seven", "7");
    stringToDigit.put("eight", "8");
    stringToDigit.put("nine", "9");

    // Sample string input
    String str = """
        two1nine
        eightwothree
        abcone2threexyz
        xtwone3four
        4nineeightseven2
        zoneight234
        7pqrstsixteen
        """;

    try {
      String line;
      int total = 0;
      // Read the string line by line
      BufferedReader br = new BufferedReader(new FileReader("/home/ilyes/AdventOfCode/Trebuchet/snowyCoordinates.txt"));
      // // stringreader(str)
      while ((line = br.readLine()) != null) {
        // Skip empty lines
        if (line.trim().isEmpty()) {
          continue;
        }

        String firstDigit = null;
        String lastDigit = null;

        // Find the first digit
        for (int i = 0; i < line.length(); i++) {
          char c = line.charAt(i);
          if (Character.isDigit(c)) {
            firstDigit = String.valueOf(c);
            break;
          }
          for (Map.Entry<String, String> entry : stringToDigit.entrySet()) {
            if (line.startsWith(entry.getKey(), i)) {
              firstDigit = entry.getValue();
              break;
            }
          }
          if (firstDigit != null)
            break;
        }

        // Find the last digit
        for (int i = line.length() - 1; i >= 0; i--) {
          char c = line.charAt(i);
          if (Character.isDigit(c)) {
            lastDigit = String.valueOf(c);
            break;
          }
          for (Map.Entry<String, String> entry : stringToDigit.entrySet()) {
            if (line.startsWith(entry.getKey(), i)) {
              lastDigit = entry.getValue();
              break;
            }
          }
          if (lastDigit != null)
            break;
        }

        // Combine first and last digits if found
        if (firstDigit != null && lastDigit != null) {
          int sum = (Integer.parseInt(firstDigit) * 10) + Integer.parseInt(lastDigit);

          total += sum;
        }
      }
      // Output the total sum
      System.out.println("Total for Part Two = " + total);
      br.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}