101 lines
2.4 KiB
C#
101 lines
2.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text.RegularExpressions;
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namespace _2020
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{
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class Q02
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{
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public static void Go()
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{
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var list = GetList();
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Part1(list);
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Part2(list);
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}
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struct Q2Entry
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{
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public int first;
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public int second;
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public char ch;
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public string pw;
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}
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static List<Q2Entry> GetList()
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{
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var list = new List<Q2Entry>();
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using var fs = new FileStream("02input.txt", FileMode.Open);
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using var sr = new StreamReader(fs);
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string line;
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var rule02 = new Regex("(?<min>[0-9]+)-(?<max>[0-9]+) (?<ch>[a-z]): (?<pw>.+)", RegexOptions.Compiled);
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while ((line = sr.ReadLine()) != null)
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{
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var match = rule02.Match(line);
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if (match.Success)
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{
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list.Add(new Q2Entry()
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{
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first = Convert.ToInt32(match.Groups["min"].Value),
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second = Convert.ToInt32(match.Groups["max"].Value),
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ch = match.Groups["ch"].Value[0],
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pw = match.Groups["pw"].Value,
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});
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}
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}
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return list;
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}
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static void Part1(List<Q2Entry> list)
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{
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int numValid = 0;
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foreach (var entry in list)
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{
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var numFound = 0;
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foreach (var ch in entry.pw)
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{
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if (ch == entry.ch)
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{
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numFound++;
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}
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}
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if (numFound >= entry.first && numFound <= entry.second)
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{
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numValid++;
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}
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}
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Util.Log($"Q02Part1: numValid={numValid}");
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}
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static void Part2(List<Q2Entry> list)
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{
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int numValid = 0;
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foreach (var entry in list)
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{
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var validConditions = 0;
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if (entry.pw.Length >= entry.first && entry.pw[entry.first - 1] == entry.ch)
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{
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validConditions++;
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}
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if (entry.pw.Length >= entry.second && entry.pw[entry.second - 1] == entry.ch)
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{
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validConditions++;
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}
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if (validConditions == 1)
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{
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numValid++;
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}
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}
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Util.Log($"Q02Part2: numValid={numValid}");
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}
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}
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}
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