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Day02.cs
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Day02.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;
namespace Advent2020
{
public class Day02 : Day
{
string[] Instructions;
public Day02(string _input) : base(_input)
{
Instructions = this.parseStringArray(_input);
}
public override Tuple<string, string> getResult()
{
return Tuple.Create(getPartOne(), getPartTwo());
}
public string getPartOne()
{
int ReturnValue = 0;
foreach (string s in Instructions)
{
MatchCollection Matches = new Regex("\\d+").Matches(s);
int Min = Int32.Parse(Matches[0].Value);
int Max = Int32.Parse(Matches[1].Value);
Matches = new Regex("[a-z]+").Matches(s);
string c = Matches[0].Value;
string Password = Matches[1].Value;
int PasswordMatches = (Password.Length - Password.Replace(c, "").Length);
if (PasswordMatches >= Min && PasswordMatches <= Max)
ReturnValue++;
}
return ReturnValue.ToString();
}
public string getPartTwo()
{
int ReturnValue = 0;
foreach (string s in Instructions)
{
MatchCollection Matches = new Regex("\\d+").Matches(s);
int Min = Int32.Parse(Matches[0].Value);
int Max = Int32.Parse(Matches[1].Value);
Matches = new Regex("[a-z]+").Matches(s);
char c = Matches[0].Value[0];
string Password = Matches[1].Value;
if (Password[Min - 1] == c ^ Password[Max - 1] == c)
ReturnValue++;
}
return ReturnValue.ToString();
}
}
}