82 lines
2.0 KiB
C#
82 lines
2.0 KiB
C#
namespace AdventOfCode.Year2023;
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public class Day1
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{
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private static List<string> Input = File.ReadAllLines("inputs/Year2023/day1.txt").ToList();
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private static int FirstNum;
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private static int LastNum;
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public static void Run()
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{
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Console.WriteLine($@"
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Day1 Solution
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Part1 Result: {Part1()}
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Part2 Result: {Part2()}
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=============================");
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}
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private static int Part1()
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{
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List<int> numbers = new List<int>();
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Input.ForEach(line =>
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{
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List<char> chars = line.ToList();
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numbers.Add(Convert.ToInt32($"{chars.First(c => Char.IsDigit(c))}{chars.Last(c => Char.IsDigit(c))}"));
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});
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return numbers.Sum();
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}
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private static int Part2()
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{
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string[] validStrNums = { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
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List<int> numbers = new List<int>();
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Input.ForEach(line =>
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{
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int min = line.Length;
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int max = -1;
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foreach (var str in validStrNums)
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{
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if (!line.Contains(str)) continue;
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int firstIndex = line.IndexOf(str);
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if (firstIndex < min)
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{
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min = firstIndex;
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FirstNum = ParseInt(str);
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}
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int lastIndex = line.LastIndexOf(str);
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if (lastIndex > max)
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{
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max = lastIndex;
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LastNum = ParseInt(str);
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}
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}
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numbers.Add(Convert.ToInt32($"{FirstNum}{LastNum}"));
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});
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return numbers.Sum();
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}
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private static int ParseInt(string str)
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{
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return (str) switch
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{
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"one" => 1,
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"two" => 2,
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"three" => 3,
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"four" => 4,
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"five" => 5,
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"six" => 6,
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"seven" => 7,
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"eight" => 8,
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"nine" => 9,
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_ => Convert.ToInt32(str),
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};
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}
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}
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